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Mole Calculation
% composition
Empirical formulas
Molecular Formulas
Balancing Review
100

How many grams are in 1 mole of Hydrogen gas?

2.0 g

100

Hydrogen in H2O

11%
100

What is the definition of an empirical formula?

The lowest whole # ratio of elements within a compound. 

100

The empirical formula for a compound is CH2, its molar mass is 28g/mol.  What is the molecular formula?

C2H4

100

 Fe+ Cl2 −−→ FeCl3

2,3,2
200

How many grams are in 0.45 moles of Calcium?

18. grams Ca

200
sodium in NaCl
39%
200

What’s the empirical formula of a molecule containing 65.5% carbon, 5.5% hydrogen, and 29.0% oxygen?

C3H3O

200

A compound with an empirical formula of C4H4O and a molar mass of 136 grams per mole.

C8H8O2

200

FeBr3 + H2SO4 −−→ Fe2(SO4)3 + HBr

2,3,1,6
300
How many moles of gold are in a 1 gram piece? 
.0051 moles of Au
300

Sulfur in N2S2

70%
300

What’s the empirical formula of a molecule containing 18.7% lithium, 16.3% carbon, and 65.0% oxygen?

Li2CO3

300

A compound with an empirical formula of C2H8N and a molar mass of 46 grams per mole.

C2H8N

300

C2H4 + O2 −−→ CO2 + H2O

1,3,2,2
400
How many grams are .025 moles of Uranium?
5.95 grams U
400

magnesium Mg(NO3)2

16%
400

The percentage composition of acetic acid is found to be 39.9% C, 6.7% H, and 53.4% O. Determine the empirical formula of acetic acid.

CH2O

400

A compound with an empirical formula of CFBrO and a molar mass of 254.7 grams per mole.

C2F2Br2O2

400

H2SiCl2 + H2O −−→ H8Si4O4 + HCl

4,4,1,8
500
Which has more atoms and why? (no calculations needed)

10g of gold or 10g of silver?

Silver has more atoms.  Silver has a smaller atomic mass therefore it would take more atoms of silver to reach the weight of 10 grams. 
500

Hydrogen in (NH4)3PO4

8%
500

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500

A component of protein called serine has an approximate molar mass of 100 g/mole. If the percent composition is as follows, what is the empirical and molecular formula of serine? C = 34.95 % H= 6.844 % O = 46.56 % N= 13.59 %

C3H7NO3

500

HSiCl3 + H2O −−→ H10Si10O15 + HCl

10,15,1,30