# Math of Chemistry Review Sheet

```Math of Chemistry Review Sheet
Solve the following. Show all work, round all atomic masses to the nearest whole number
What is the gram formula mass of (NH4)2SO3
Ca(OH)2
K2CrO7
Calculate the number of moles in
Calculate the mass of
25grams of Pb(NO3)2
127grams of HgI
3grams of KMnO4
7.5moles of H2SO4
12moles of NaOH
5.5moles of NaHCO3
What is the percent composition of Nitrogen in NH3
Carbon in CO2
Water in MgSO4&middot;7H2O
Water in CuCl2&middot;2H2O
Calculate the percentage composition of water in the following hydrates if:
A 12gram Hydrate in heated to a constant mass of 6grams
A 16gram Hydrate is heated to a constant mass of 12grams
A 15gram Hydrate is heated to a constant mass of 10grams
What is the molecular formula if
The formula mass is 80 and the empirical formula is CH4
The formula mass is 34 and the empirical formula is HO
The formula mass is 78 and the empirical formula is CH
How many significant figures are there in the following numbers
0.0000754
000.105
107.000 25.0005
N2 + 3H2 → 2NH3
How many moles of ammonia will be produced if 12 moles of Hydrogen are consumed
4Fe + 3O2  2Fe2O3
How many moles of iron will be used if 5 moles of iron(III)oxide are produced.
C6H12O6 + 9O2  6CO2 + 6H2O
How many moles of water will be produced if 4 moles of C6H12O6 are consumed
What is the percent error if the accepted value is 5.4 and the experimental value is 6.2
What is the percent error if the accepted value is 10 and the experimental value is 9.5
What is the percent error if the accepted value is .25 and the experimental value is 0.2
What is the density of the following. Give your answer in correct number of significant figures
A cube with a volume of 5.0cm3 and a mass of 25.00grams
A block with a volume of 36.00cm3 and a mass of 114.0grams
A rock with a volume of 16.00cm3 and a mass of 96.00grams
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