Mole Problems
How many moles are in 25 g of H2O?
1.39 mol
88.8% copper; 11.2% oxygen
Cu2O
A compound with an empirical formula of C2OH4 and a molar mass of 88 grams per mole. What is the molecular formula of this compound?
C4O2H8
CuBr2
Cu: 28.4% Br: 71.6%
What is the molar mass of AlSO3
107 mol
Oxygen atoms in 4.90 mol in Al2O3
8.85 x 1024
5.88% hydrogen; 94.12% oxygen
HO
A compound with an empirical formula of C2H8N and a molar mass of 46 grams per mole. What is the molecular formula of this compound?
C2H8N
N2S2
N: 30.4% S: 69.6%
What is the molar mass of HeNO3?
66 mol
Hydrogen Atoms in 3.14 mol of H2O
3.78 x 1024 atoms
70.0% iron; 30.0% oxygen
4. Fe2O3
The empirical formula is C5H4 and its molar mass is 128.16g/mol. Find the molecular formula.
C10H8
HCl
H: 3% Cl: 97%
What is the Molar mass of CClO
63.45 mol
Nitrogen atoms in 2.79 mol of NH3
1.68 x 1024 atoms
7.19% phosphorus; 92.81% bromine
PBr5
A compound with the following composition has a molar mass of 60.10g/mol: 39.97% carbon; 13.41% hydrogen; 46.62% nitrogen. Find the molecular formula.
C2H8N2
Mg(NO3)2
Mg: 16% N: 19% O: 65%
What is the molar mass of NaHCO3 ?
83.98 mol
How many atoms are in a 3.56 g sample of Cu?
3.37 x 1022
40% carbon; 6.7% hydrogen; 53.3% oxygen
CH2O
A compound with an empirical formula of CFBrO and a molar mass of 254.7 grams per mole. What is the molecular formula of this compound?
C2F2Br2O2
(NH4)2S
N: 41.1% H: 11.8% S: 47.1%
What is the molar mass of AgClO3 ?
191.31 mol