1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Anvisha [2.4K]
3 years ago
9

A 0.167-g sample of an unknown compound contains 0.00278 mol of the compound. Elemental analysis of the acid gives the following

percentages by mass: 40.00% C; 6.71% H; 53.29% O.
Chemistry
1 answer:
ratelena [41]3 years ago
8 0

Answer:

Emperical formula of the acid is CH2O

Molecular formula is C2H4O2

Explanation:

C. H. O

% by mass. 40. 6.71 53.29

MW. 12. 1. 16

Mole 40/12. 6.71/1. 53.29/16

3.33. 6.71. 3.33

3.33/3.33 6.71/3.33 3.33/3.33

1. 2. 1

Emperical Formula (EF): CH2O

Molecular Formula (MF)

Molecular Weight (MW) of acid = mole/mass = 0.00278/0.167 = 60g/mol

MF = (EF)n = 60

(CH2O)n = 60

(12+2+16)n = 60

30n = 60

n = 60/30 = 2

Molecular formula = (EF)n = (CH2O)2 = C2H4O2

You might be interested in
At which temperature and pressure will a sample of neon gas behave most like an ideal gas?
Andreas93 [3]

Answer:

At STP, 760mmHg or 1 atm and OK or 273 degrees celcius

Explanation:

The standard temperature and pressure is the temperature and pressure at which we have the molecules of a gas behaving as an ideal gas. At this temperature and pressure, it is expected that the gas exhibits some properties that make it behave like an ideal gas.

This temperature and pressure conform some certain properties on a gas molecule which make us say it is behaving like an ideal gas. Ordinarily at other temperatures and pressures, these properties are not obtainable

Take for instance, one mole of a gas at stp occupies a volume of 22.4L. This particular volume is not obtainable at other temperatures and pressures but at this particular temperature and pressure. One mole of a gas will occupy this said volume no matter its molar mass and constituent elements. This is because at this temperature and pressure, the gas is expected to behave like an ideal gas and thus exhibit the characteristics which are expected of an ideal gas

4 0
3 years ago
Read 2 more answers
Sodium peroxide (Na2O2) is often used in self-contained breathing devices, such as those used in fire emergencies, because it re
Anastaziya [24]

Answer:

725.15 L

Explanation:

The balanced chemical equation for the reaction between Na₂O₂ and CO₂ is the following:

Na₂O₂ + CO₂ → Na₂CO₃ + 1/2 O₂

From the stoichiometry of the reaction, 1 mol of Na₂O₂ reacts with 1 mol CO₂. So, the stoichiometric ratio is 1 mol Na₂O₂/1 CO₂.

Now, we convert the mass of reactants to moles by using the molecular weight (Mw) of each compound:

Mw (Na₂O₂) = (23 g/mol x 2) + (16 g/mol x 2) = 78 g/mol

moles Na₂O₂ = 96.7 g/(78 g/mol) = 1.24 mol Na₂O₂

Mw (CO₂) = 12 g/mol + (16 g/mol x 2) = 44 g/mol

moles CO₂ = 0.0755 g/(44 g/mol) = 1.71 x 10⁻³ mol CO₂

Now, we calculate the number of moles of CO₂ we need to completely react with the mass of Na₂O₂ we have:

1.24 mol Na₂O₂ x 1 mol CO₂/1 mol Na₂O₂ = 1.24 mol CO₂

In 1 L of respired air we have 1.71 x 10⁻³ mol CO₂ (0.0755 g), so we need the following number of liters to have 1.24 mol of CO₂:

1.24 mol CO₂ x 1 L/1.71 x 10⁻³ mol CO₂ = 725.15 L

4 0
3 years ago
Phosphine, PH3(g), decomposes according to the equation 4PH3(g) --> P4(g) + 6H2(g) The kinetics of the decomposition of phosp
TEA [102]

good luck with that. I thought I had it, but it was not right.

3 0
3 years ago
Read 2 more answers
An ionic bond is a bond between
OleMash [197]

between two oppositely charged ions

7 0
3 years ago
Read 2 more answers
What is the maximum number of electrons that any 'p' sublevel can hold? 2 electrons 6 electrons 8 electrons 10 electrons
Varvara68 [4.7K]
6 electrons... 's' can hold 2..... 'd' can hold 10 and 'f' can hold 14
6 0
3 years ago
Read 2 more answers
Other questions:
  • In a car piston shown above, the pressure of the compressed gas (red) is 5.00 atm. If the area of the piston is 0.0760 m^2. What
    7·1 answer
  • Why is water called the universal solvent
    15·2 answers
  • If 200. mL of 0.60 M MgCl2(aq) is added to 400 mL of distilled water, what is the concentration of Mg and Cl in the resulting so
    11·1 answer
  • The Theory of Plate Tectonics states that the Earth’s surface is divided into large sections called the _____________. (This is
    6·1 answer
  • Wes melted some cheese over some tortilla chips to make nachos.
    11·2 answers
  • Compare the nuclear charge of nitrogen to oxygen on the valance electrons.
    12·1 answer
  • Please help me fast ​
    11·1 answer
  • 8. Which of the following have bacteria in their root nodules that fix nitrogen?
    12·1 answer
  • The
    6·1 answer
  • PLEASE HELP ME WITH THID IFK IT!! ILL GIVE YOU EXTRA POINTS
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!