Mass
Conversions
Avogadro's
Number
Volume
Conversion
Percent
Composition
Empirical vs Molecular Formula
100

When doing mass conversions, what do you need to know about the compound/element?

Molar Mass

100

What is Avogadro's Number?

6.022 * 1023

100

What is the constant to convert moles to liters?

22.4 L

100

What is percent composition useful for?

Determining the chemical formula

100

H2O2 is an example of which type of formula?

Molecular

200

What is the molar mass of HCl?

36.46 g/mol

200

How many moles are in 7.07*1023 atoms of nitrogen?

1.17 moles

200

What are the units used for volume 

L for Liters 

200

A 13.60 g sample of a compound, containing only magnesium and oxygen, is decomposed. There was 5.40 g of oxygen obtained during the decomposition. What is the percent composition of this compound?

39.7% O

60.3% Mg

200

What is the empirical for C6H12O6?

CH2O

300

What is the mass of 2.56 moles of sodium hydroxide?

102 g

300

How many atoms are in 1.5 moles of silver?

9.0*1023 atoms

300

What is STP and why is it important?

standard temp and pressure. 0 degrees celsius and 1 atm. This lets us know that we do not need to account for pressure and temp in our equation 

300

What is the percent composition of Na2S2O3

% Na = 29.1%

% S = 40.6%

% O = 30.4%

300

Determine the empirical formula for a compound with the following percent composition:

15.8% carbon and 84.2% sulfur

CS2

400

How many moles are in 75.4 g of H2SO4?

0.769 moles

400

How many moles are in 3.0*1025 representative particles of sugar?

50 moles

400

At STP, what is the volume of 0.58 moles of HCl gas?

13 L

400

What is the mass of chlorine and hydrogen in 56 g of HCl? The percent composition is 2.8% H and 97.2% Cl

1.6 g H

54.4 g Cl

400

Determine the empirical formula for a compound with the following percent composition:

67.9% C, 5.70% H, 26.4% N  

C3H3N

500

How many moles are in 92.1 g of hydrogen phosphate?

1.12 moles

500

How many representative particles of salt are in 9.89 moles?

5.96*1024 representative particles

500

At STP, how many moles are in 110.2 L of bromine gas?

4.92 moles

500

A 3.56 g sample of pure iron powder was heated in gaseous chlorine, and 10.39 g of an iron chloride was formed. What is the percent composition of this compound?

34.3% Fe

65.7% Cl

500

A major textile dye manufacturer developed a new yellow dye. The dye has a percent composition of 75.95% C, 17.72% N, and 6.33% H by mass with a molar mass of about 240 g/mol. Determine the molecular formula of the dye.  

C15H15N3