WorksheetsMolecular Weight/ % Mass/ Empirical Formulas and Balancing RXNS
Total questions: 22
Worksheet time: 2hrs 50mins
What is the molecular weight of Ca3(PO4)2
310 g/mol
296.6 g/mol
342 g/mol
225 g/mol
What is the molar mass of Ca(NO3)2?
148.096 g
164.086 g
102.055 g
70.084 g
Calculate the molar mass for Al(OH)3
78.0 g/mol
72 g/mol
28 g/mol
25 g/mol
What is the percent by mass of Oxygen in water? H2O.
33 %
88.9%
11.1%
50%
What is the percent by mass of Carbon in sugar C12H22O11 ?
144.0
42.1
12.01
342.0
The formula of a compound having the smallest whole-number ratio of atoms in the compound is called ____?
Chemical Formula
Empirical Formula
Mass formula
Ideal formula
What would the percent by mass be of Oxygen in a compound that has a formula of C10H18O ?
154.0
77.9
10.4
11.7
What is the empirical Formula of an unknown compound that is 18.8% sodium, 29.0% chlorine and 52.2% Oxygen?
Hint *(Don't forget to assume a 100 gram sample)
NaClO
Na2Cl2O3
NaClO4
NaClO3
What is the empirical formula for a compound that is 40% Carbon, 6.70% Hydrogen and 53.3% oxygen?
Hint*(remember to assume 100 g sample)
CHO
CH2O
CH3O
CH2O2
Quinone, which is used in the dye industry and in photography, is an organic compound containing only C, H, and O. What is the empirical formula of the compound if you find that 0.105 g of the compound gives 0.257 g of CO2 and 0.0350 g of H2O when burned completely? Given a molecular weight of approximately 108 g/mol, what is its molecular formula?
CHO
C2H4O8
C6H4O2
C3H2O
Balance the following:
____ Fe + ____ Cl2 → ____ FeCl3
Which type of reaction is:
2 NaBr + Ca(OH)2 → CaBr2 + 2 NaOH
Which type of reaction is:
2 H3AsO4 → As2O5 + 3 H2O
Which type of reaction is:
3 Pb + 2 H3PO4 → 3 H2 + Pb3(PO4)2
Balance this reaction:
____ Na3PO4 + ____ KOH ---> ____ NaOH + ____ K3PO4
1,3,3,1
1,3,2,1
2,3,3,1
1,1,3,1
Balancing this reaction:
____ CH4 + ____ O2 ---> ___ CO2 + ____ H2O
2,1,3,1
1,2,1,2
1,2,2,1
2,1,1,2
Balance this reaction:
____ NaF + ____ Br2 ---> ___ NaBr + ____ F2
3,1,2,1
1,2,3,4
2,1,2,1
1,2,1,2
Balance this reaction:
____ RbNO3 + ____ BeF2 ----> ____ Be(NO3)2 + ____ RbF
1,1,1,1
1,2,1,1
2,1,1,2
2,1,2,1
H2 +02-->H202
CH4 + O2 --> CO2 + H2O
H2O2 --> H2+ O2
2Na + CaCO3 --> Ca + Na2CO3
CuNO3 + CaCO3 --> CuCO3 + CuNO3
