MOLEcules
Molar Mass
Empirical Formula
Percent Composition
Gram and moles
100
1 mole of carbon= ? g of carbon
What is 12.01g carbon
100
The molar mass of NaCl
What is 57.67 g
100
9.350 mol O 4.675 mol N find the empiricial formula with the given mol **Note, they have already been converted from % to g and from g to mol**
What is NO2
100
if water (H20) is 18.02g and hydrogen is 2.02g Find the percent of hydrogen in water (H20)
What is 11.2% hydrogen
100

How many moles in 2.65 g Fe?

0.0474 mol Fe

200
2 mol of oxygen = ? g of oxygen
What is 32g of oxygen
200
The molar mass of CaCl2
What is 110.98g
200
40.05%S 59.95%O Find the empirical formula
What is SO3
200
Find the percent oxygen of water if you have 2.02g of hydrogen and 18.02g of water (H20)
What is 16g of oxygen
200

How many grams in 6.50 moles Cu

413 g Cu

300
The number of molecules in 11.5 mol H20
what is 6.92 x 10^24 molecules H20
300
find the total mass of Cu4(OH)6SO4
What is 452.33g Cu4(OH)6SO4
300
36.84% N 63.16% O Find the empirical formula for the compound.
What is N2O3
300
Find the percent composition of oxygen in C3H6O2
What is 43.2%
300

Find the mass of 1.00 X1023 molecules of nitrogen gas

4.65 grams

400
Find the amount of particles of oxygen in NO2
What is 1.2 x 10^24 particles of oxygen in NO2
400
the molar mass of CaCO3
What is 100.09g CaCO3
400
Find the empirical formula that contains 10.89% Mg 31.77% Cl 57.34% O
What is Mg(ClO4)2 or MgCl2O8
400
the percent of sulfur in Al2S3
What is 64.02%
400

How many grams in 4.50 x 10^12 molecules aluminum oxide?

7.62 x 10^-10 g 

500
The number of atoms of Na in Na2SO3 with a mass of 2.25
What is 1.08 x 10^22 Na find the molar mass (Na=45.89, S=32.07g, O=48.00, Na2SO4= 126.04g) then convert 2.25g Na2SO4 into mol by dividing its mass
500
find the molar mass of Ca5(PO4)3F
What is 504g
500
find the empirical formula for 17.9g C 1.68g H 4.23g O 1.23g N
What is C17H19NO3 (morphine)
500
the percent of hydrogen in C3H8
What is 18.18% hydrogen in C3H8
500

How many grams in 8.420 x 1024 atoms Bromine?

2234 g Br

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