Answer:
C₂HO₂Br₃
Explanation:
Data given
Carbon = 8.09%
Hydrogen = 0.34%
Oxygen = 10.78%
bromine = 80.78%
Empirical formula = ?
Solution:
First find the masses of each component
Consider total compound is 100g
As we now
mass of element = % of component
So,
8.09 g of C = 8.09% of Carbon
0.34 g og H = 0.34% of Hydrogen
10.78 g of O = 10.78% of Oxygen
80.78 g of bromine = 80.78% of bromine
Now convert the masses to moles
For Carbon
Molar mass of C = 12 g/mol
no. of mole = mass in g / molar mass
Put value in above formula
no. of mole = 8.09 g/ 12 g/mol
no. of mole = 0.674
mole of C = 0.6742
For Hydrogen
Molar mass of H = 1 g/mol
no. of mole = mass in g / molar mass
Put value in above formula
no. of mole = 0.34 g/ 1 g/mol
no. of mole = 0.34
mole of H = 0.34 mole
For Oxygen
Molar mass of O = 16 g/mol
no. of mole = mass in g / molar mass
Put value in above formula
no. of mole = 10.78 g/ 16 g/mol
no. of mole = 0.674
mole of O = 0.674 mole
For Br
Molar mass of Br = 80 g/mol
no. of mole = mass in g / molar mass
Put value in above formula
no. of mole = 80.78 g/ 80 g/mol
no. of mole = 1.0098
mole of Br = 1.0098 moles
Now we have values in moles as below
C = 0.6742
H = 0.34
O = 0.674
Br = 1.0098
Divide the all values on the smallest values to get whole number ratio
C = 0.6742 / 0.34 = 1.983 ≅ 2
H = 0.34 / 0.34 = 1
O = 0.674 /0.34 = 1.983 ≅ 2
Br = 1.0098 / 0.34 = 2.97 ≅ 3
So all have round value 1 mole
C = 2
H = 1
O = 2
Br = 3
So the empirical formula will be C₂HO₂Br₃ i.e. all 3 atoms in simplest small ratio
The empirical formula of the compound is CH₂OBr.
Explanation:The empirical formula can be determined by finding the ratio of the number of atoms of each element in the compound. To find the empirical formula, we first convert the percentages to grams. Using the given percentages, we can assume we have 100 grams of the compound. Hence, we have 8.09 grams of carbon, 0.34 grams of hydrogen, 10.78 grams of oxygen, and 80.78 grams of bromine.
Next, we convert the grams to moles by dividing each mass by the atomic weight of the respective element from the periodic table. The atomic weights are approximately 12.01 g/mol for carbon, 1.01 g/mol for hydrogen, 16.00 g/mol for oxygen, and 79.90 g/mol for bromine.
After finding the number of moles for each element, we divide each value by the smallest number of moles to get a simple whole number ratio. In this case, the smallest number of moles is 0.0816 moles, which corresponds to carbon. Hence, the ratio is approximately C₁H₀.₀₅ O₀.₂₇ Br₁, which simplifies to CH₂OBr.
How many atoms are presented in 3.8 moles of sodium hydroxide, NaOH
Answer:
Sodium hydroxide has the formula NaOH and it contains three atoms, one each of Sodium, Hydrogen and Oxygen.
Explanation:
Answer: 1.806 x 10^24 atoms
Explanation:Please see attachment for explanation
How does changing the mass of an object affect the density and the object if the volume is kept constant
Explanation:
mass of an object affect the density and object if the the volume is keep constant.
here we can explain by using the example.
if the mass of an object is 30kg. and volume is 2m3
then density pf given substance is become 15kg/m3
again,
if the mass of the is 40kg/m3 and volume is same
then density is become 20kg/m3 (formula=kg/m3)
here above density and below density is becime different by changing the mass of an object and affect the density and objecy although volume is kept constant or same
Answer: An increase in mass will increase the density
A decrease in mass will decrease the density
Explanation: So any changes in the mass of the object will affect its density even with constant volume. Mass is directly proportional to density. So when mass is increased density will increase as well and vice versa.
The 1. BLANK difference between the ice cubes and the water causes 2.BLANK energy to be transferred from the water to the ice cubes.
Drop down with 1. temperature or size
drop down with 2. cold or heat
PLEASE HELP
Answer:
the temperature difference between the water and the ice cubes causes heat to be transferred from the water to the ice cubes,.
Explanation:
Heat always travels to where it is colder. Think about how ice cubes melt. They are very cold so the heat is transferred to them from he warmer water and they melt.
hope this helps! i would really appreciate brainliest :)
Answer:
temperature hear
Explanation:
What is one example of a response?
the angle of the sun changing during the day
outside temperature dropping at night
ivy growing around the pole of a fence
water lost from the lungs during breathing
Answer:
ivy growing around the pole of a fence
Explanation:
Consider the following reactions. (Note: (s) = solid, () = liquid, and (g) = gas.)
V2H2(g) + 1212(9) - HI(g), AH = +6.2 kcal/mole
21.0 kcal/mole + C(s) + 2S(s) - CS2(1)
What type of reaction is represented by the previous two examples?
endothermic
exothermic
Answer:
Both are endothermic reactions.
Explanation:
Chemical equation:
1/2H₂(g) + 1/2I₂(g) → HI(g) + 6.2 kcal/mol
Chemical equation:
21.0 kcal/mol + C(s) + 2S(s) → CS₂
Both reaction are endothermic because heat is added in both of reactions.
Endothermic reactions:
The type of reactions in which energy is absorbed are called endothermic reactions.
In this type of reaction energy needed to break the bond are higher than the energy released during bond formation.
For example:
C + H₂O → CO + H₂
ΔH = +131 kj/mol
it can be written as,
C + H₂O + 131 kj/mol → CO + H₂
Exothermic reaction:
The type of reactions in which energy is released are called exothermic reactions.
In this type of reaction energy needed to break the bonds are less than the energy released during the bond formation.
For example:
Chemical equation:
C + O₂ → CO₂
ΔH = -393 Kj/mol
it can be written as,
C + O₂ → CO₂ + 393 Kj/mol
What is the job of a scientist?
A. To write laws based on his or her knowledge.
O
B. To ask and answer scientific questions.
C. To answer ethical questions.
O
D. To ignore facts that do not support his or her theory.
Answer:
B. To ask and answer scientific questions
To ask and answer scientific questions is the job of a scientist. Therefore, the correct option is option B.
The systematic examination of natural events through theoretical analysis and experimental is referred to as scientific research. Its main goal is to increase our knowledge of and comprehension of numerous scientific disciplines as well as our understanding of the world around us. A hypothesis is a put forth explanation for a phenomenon based on prior information or observation that serves as the starting point for scientific inquiry. Then, using a series of carefully planned tests or observations, this hypothesis is verified.
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an 85g has a volume of 850cm3 , what is the density of the rock
show your answer
Explanation:
given
mass =85*1000=85000kg
volume=850/100*100*100m3
now,
density=mass / volume
=85000kg/850000000m3
=1/10000kg/m3
=0.0001kg/m3
the density of the rock is 0.0001kg/m3.
which half reaction describe what is taking place at the cathode during the electrolysis of melting salt of NaCl?
Answer:
Na+ e- - Na
Explanation:
The maximum number of electrons in a single d subshell is:
Answer:
10 electrons
Explanation:
Answer:
The answer is: 10 electrons
Explanation:
A chemistry student needs 45.00g of 4-methyl-2-pentanone for an experiment. He has available 0.50 kg of a 10.9% w/w solution of 4-methyl-2-pentanone in acetone. Calculate the mass of solution the student should use.
Answer:
0.412 Kg of Solution
Explanation:
To solve this problem we will first find the number of grams of solute contained by the given amount of solution as,
w/w% = weight of solute / weight of solution × 100
Solving for weight of solute,
Weight of solute = w/w% × weight of solution / 100
Putting values,
Weight of solute = 10.9 × 500 g / 100
Weight of solute = 54.5 g
Hence,
54.5 g of solute was contained by = 500 g of solution
So,
45.0 g of solute will be contained by = X g of solution
Solving for X,
X = 45.0 g × 500 g / 54.5 g
X = 412.84 g
Or,
X = 0.412 Kg of Solution
Final answer:
To obtain 45.00g of 4-methyl-2-pentanone from a 10.9% w/w solution, the student should measure out 412.84g of the solution.
Explanation:
To calculate the mass of the solution the student should use to get 45.00g of 4-methyl-2-pentanone from a 10.9% w/w solution, we first need to understand what a w/w solution means. It indicates that for every 100g of solution, there is 10.9g of the solute (4-methyl-2-pentanone). To find the mass of the solution needed for 45.00g of the solute, the following calculation should be performed:
Mass of solute (desired) = % w/w × mass of solution
Therefore, mass of solution = Mass of solute (desired) / % w/w
So:
Mass of solution = 45.00g / 0.109 = 412.84g
The student should therefore measure out 412.84g of the 10.9% solution to obtain 45.00g of 4-methyl-2-pentanone.
450 nanometers to meters
Answer: 4.5 x 10e-7
Explanation: 450 x 1e+9 = correct answer
Multiply amount of nanometers by 1e+9 to get the approximate result in meters.
To convert 450 nanometers to meters, you multiply 450 by 10^-9 to give 4.5 x 10^-7 meters. This places it within the blue light section of the visible spectrum.
Explanation:To convert a measurement from nanometers (nm) to meters (m), we should recall that 1 nanometer is equal to one billionth of a meter, or 10^-9 m. Therefore, to convert 450nm to meters, you multiply 450 by 10^-9 which gives you the answer of 4.5 x 10^-7 meters. That places it well within the visible spectrum of the electromagnetic spectrum, between 380nm and 740nm, specifically in the blue light range.
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state and explain the hess's law
Answer:
I had to do some research, because I not familiar with Hess's Law.
Hope this helps :)
Stating Hess's Law
Hess's Law is the most important law in this part of chemistry. Most calculations follow from it. It says "The enthalpy change accompanying a chemical change is independent of the route by which the chemical change occurs."
Explaining Hess's Law
Hess's Law is saying that if you convert reactants A into products B, the overall enthalpy change will be exactly the same whether you do it in one step or two steps or however many steps.
Answer:
Hess's Law of Constant Heat Summation (Hess's Law) states that regardless of the multiple stages or steps of a reaction, the total enthalpy change for the reaction is the sum of all changes
Explanation:This law is a manifestation that enthalpy is a state function.
How quickly must non-frozen ready-to-eat foods be consumed?
24 hours
.
48 hours
.
3 days
.
7 days
Answer:
24 hours
Explanation:
Frozen foods are foods that were put in a refrigerator. The essence of putting food in a refrigerator is to lower the rate at which microbes cause the spoilage of the food by lowering its temperature considerably.
After 24 hours, microbes must have commenced action on non-frozen ready to eat foods causing them to spoil in not more than 24hours.
Non-frozen ready-to-eat foods should be consumed within : 24 hours
Non-frozen foods are to be consumed within 24 hours, because microbes that causes the spoilage of foods starts acting on ready-to-eat foods, after 24 hours. ready-to-eat foods are foods are processed foods that can be consumed immediately. example : smoked fish and salads
Frozen foods are refrigerated in order to keep the temperatures of the foods below the allowable temperature in which microbes tend to act on ready-to-eat foods.
Hence we can conclude that Non-frozen ready-to-eat foods should be consumed within 24 hours.
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You have 3 moles of a substance. Which of the following statements is true?
A. You have three times the number of particles that are in 12 grams of carbon-12.
B. You have the same number of particles as in 12 grams of carbon-12.
C. You have six times the number of particles that are in 12 grams of carbon-12.
D. You have one-third the number of particles that are in 12 grams of carbon-12.
Answer:
Option A is correct: You have three times the number of particles that are in 12 grams of carbon-12
Explanation:
Data given:
3 moles of substance equal to how many particles of 12 g of carbon-12.
Solution:
First we find the number of particles in 3 moles of substance
Formula used
no. of moles = no. of particles / Avogadro's number
Rearrange the above formula
no. of particles = no. of moles x Avogadro's number . . . . . . . . (1)
Where
Avogadro's number = 6.022 x 10²³
Put values in above equation
no. of particles = 3 x 6.022 x 10²³ (particles/mol)
no. of particles = 1.8066 x 10²⁴ Particles
So,
3 mole of substance have 1.8066 x 10²⁴ Particles
Now
we have to find number of particles in 12 g of carbon-12
for this first find no. of moles
formula used
no. of moles = mass in grams/ molar mass . . . . . (2)
molar mass of carbon = 12 g/mol
Put values in equation 2
no. of moles = 12 g / 12 (g/mol)
no. of moles = 1 mole
So,
12 g of carbon 12 equal to 1 mole.
According to Avogadro's law 1 mole of any substance consists of 6.022 x 10²³ number of particles.
So
1 mole carbon = 6.022 x 10²³ particles
and 3 mole of substance = 1.8066 x 10²⁴ Particles
It means that we have three times number of particles that are in 12 g of carbon-2
So, Option A is correct.
A. You have three times the number of particles that are in 12 grams of carbon-12.
What kind of ions do a sodium atom and a chlorine atom become when a valence electron is transferred from one to the other?
Answer:
The sodium atom becomes a positive ion and the chlorine atom becomes neg.
Explanation:
Think about this answer
Chemical A and Chemical B react in an exothermic reaction. What can be known about what will happen when Chemical A and Chemical B are mixed together?
Answer:
More energy will be released from the old substance than the new substance will need to form it's chemical bonds.
Explanation:
Given
Chemical A and Chemical B react in an exothermic reaction.
This means energy is released when they react to give products. The product formation also requires energy, which is got from the energy released when A and B reacts. The energy that is left after the formation of products is released as heat. So in order for a reaction to be exothermic, the energy released by the reactants should be more than the energy required for the new chemical bonds to be formed to give the products.
Answer:
I think B correct me if im wrong
Explanation:
hope i helped
Convert 8.7 mg to ibs
Answer:
7
Explanation:
Answer:
in ibs it is 1.918e-5 ibs
Explanation:
The molecular structure of water contains two end of hydrogen and one hour of oxygen. When water reaches its boiling point and turns into water vapor, what happens to it Molecular structure?
Explanation:
5 difference between conductor and electrolyte
Answer :the electrolytes conduct electricity due to movement of ions (cations and anions), while the conductors conduct electricity due to movement of electrons only.
Explanation:
Assuming all protons can be seen in this atom what is the charge in this ion
Answer:
A proton has positive charge of 1, that is, equal but opposite to the charge of an electron. A neutron, like the name implies, is neutral with no net charge. The charge is believed to be from the charge of the quarks that make up the nucleons (protons and neutrons). need a pictur of the question
Explanation:
How many moles are there in 2.00 x 10^19 molecules of CCl4
Answer: 0.0000332mol
Explanation: 1mole of CCl4 contains 6.02x10^23 molecules.
Therefore, X mol of CCl4 will contain 2 x 10^19 molecules i.e
Xmol of CCl4 = 2 x 10^19/ 6.02x10^23 = 0.0000332mol
Explain why the magnesium can be stretched to form magnesium ribbon...??
Help me plzz....40 points
Answer:
Because of its malleability.
Explanation:
Magnesium is alkaline earth metal.
It is present in second group.
It is shiny gray color metal.
It is lighter but strong.
Its density is 1.738 g/mL.
It is soft and can be malleable. Magnesium ribbons are also formed by stretching the magnesium metal and this is due to the malleability of magnesium.
Magnesium ribbon burns and produces heat.
It is used to make the many light weight products such as many parts of car, phone, laptop, luggage etc.
It is also used to remove the sulfur such as from iron and steel.
It is also used in fireworks.
It is also used in medicine such as for constipation.
It is used as antiacid for heart burn.
Consider the following statements:
Prediction: It will rain before Monday
evening if it is cloudy when the sun goes
down on Friday evening.
Observation: Every week for two months
the above prediction held true.
Given this observation, should the
prediction be accepted as a fact?
A Yes; an event that happens so frequently
is almost certain to continue to happen
regularly.
B Yes; if a hypothesis holds true during
several observations, it is a scientific fact.
C No; the observations were not made in a
laboratory
No; the prediction should not be accepted
without additional observations.
Dichloromethane contains strong carbon - hydrogen and carbon- chlorine bonds. Despite the presence of these strong bonds. dichloromethane is a liquid...explain why??
can some one help me ??
50 points
Answer:
vot. tofu p f focpxe9d3dotc
Explanation:
circeicirct pupdtoxkr
Final answer:
Despite having strong C-H and C-Cl bonds, dichloromethane is liquid due to strong dipole-dipole intermolecular forces and van der Waals forces resulting from its considerable dipole moment and molecular size.
Explanation:
The question asks why dichloromethane is a liquid despite having strong carbon-hydrogen (C-H) and carbon-chlorine (C-Cl) bonds. While the individual molecular bonds within dichloromethane are indeed strong (due to significant differences in electronegativity between carbon, hydrogen, and chlorine), the phase state (gas, liquid, or solid) of a substance at room temperature depends on the intermolecular forces between its molecules, not just the strength of the bonds within individual molecules. Dichloromethane, having a considerable dipole moment due to its polar C-Cl bonds, exhibits stronger intermolecular forces known as dipole-dipole interactions. These interactions, though weaker than covalent bonds, are significantly strong enough to keep the molecules close together in a liquid state at room temperature. Additionally, the molecular weight and size of dichloromethane contribute to stronger van der Waals forces (or London dispersion forces), which further supports its liquid state. Unlike smaller molecules that might be gases at room temperature, dichloromethane has just the right balance of molecular weight and intermolecular forces to exist as a liquid.
NH3 (g) + HCl (g) + NH4Cl (s)
What type of reaction does this equation represent?
Answer:
Synthesis
Explanation:
Reaction Given:
NH₃+ HCI ------> NH₄Cl
Type of reaction = ?
Solution:
Look at the reactants and products of the reaction to know the type of reaction
NH₃+ HCI ------> NH₄Cl
In this reaction two reactant combine and give 1 products.
Reactant of the reaction
NH₃ = Ammonia
HCl = Hydrochloric acid
Product of the reaction
NH₄Cl = Ammonium chloride
So,
That ammonia (NH₃) react with Hydrochloric acid (HCl) and produces salt.
in this reaction NH₃ is a week base and take a proton from HCl and form ammonium ion and Cl ion. these two ions in combine form gives a salt called ammonium chloride.
Type of Reaction:
This is type of synthesis reaction, in which NH₃ and HCl combine and form a new compound that is ammonium chloride salt (NH₄Cl). As the synthesis reaction is that reaction in which two are more compounds or molecules combine and form a new compound.
A 0.43g sample of potassium hydrogen phthalate required 24.11cm³ NaOH for neutralization. Calculate the molarity of the NaOH
Answer
The mole ratio is 1:1
The molar mass of potassium hydrogen phthalate (C8H5KO4) is 204.22g/mol
The mass of C8H5KO4 is 0.43g
The no of moles of C8H5KO4 = mass/molar mass
No of Moles of C8H5KO4 = 0.000210557242mol
From Mole ratio the no of mole of NaOH that reacted with C8H5KO4 0.000210557242
Therefore, molaroty of NaOH is mole of NaOH/the Volume in L
Molaroty if NaOH = 0.000210557242/0.02411 = 0.08733M
Which proportionality applies to Avogadro’s law? V is proportional to StartFraction 1 over P EndFraction. V is proportional to T. P is proportional to T. V is proportional to n.
Answer:
d v&n
Explanation:
its on edge!
Proportionality that applies to avogadro's law is V is propportional to n.
According to Avogadro's law, equal volumes of various gases each contain an equal amount of molecules at the same temperature and pressure. On the presumption of an ideal (perfect) gas, this experimental relation can be deduced first from kinetic theory of gases. For actual gases, the law is roughly applicable when temperatures and pressures are both low enough.
Avogadro's number, or even the Avogadro constant, is the precise quantity of molecules inside one gram-mole of such a material, defined as that of the molecular weight metric grams, which is equal to 6.022×10²³.
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is a leaf a solid,liquid or gas?
Answer:solid
Explanation:
Answer:
It is a solid because leafs aren't made of water or gas.
the number of moles in 2.93 g of Li2O in corrext sig figs
Answer:
0.1 mol
Explanation:
Number of mole= mass/molar mass
lithium have a mass number of 7 and oxygen have a mass number of 16.
so, (7x2) + 16
= 30
therefore, number of moles = 2.93/30
= 0.10
Answer:
Mass of Li2O = 2.93g
Molecular mass of Li2O = 29.88g/mol
No of mole of Li2O = Mass/Molar mass
No of mole of Li2O = 2.93/29.88
No of mole of Li2O = 0.0981mol
A clear prediction of the anticipated results in an experimental design is known as
A clear prediction of the anticipated results in an experimental design is known as "Hypothesis".
Explanation:
A theory or hypothesis are often used clearly as a suggested event descriptive one. The scientific methods need that one can be able to examine for a hypothesis termed as scientific hypothesis.
A working in hypothesis is a proposed provisionally accepted hypothesis for on-going research that starts with an appropriate amount of conclusion and thoughts, also known as "Educated Guess".
According to researchers like Schick and Vaughn the weighing up an alternative hypotheses might be taken into understanding like Parsimony, testability, Fruitfulness, Scope and Conservatism.