Mastering Chemistry Concepts

Balance the equation: C3H8 + O2 → CO2 + H2O

• C3H8 + 6 O2 → 2 CO2 + 2 H2O

• C3H8 + 4 O2 → 3 CO2 + 5 H2O

• C3H8 + 5 O2 → 3 CO2 + 4 H2O

• C3H8 + 3 O2 → 2 CO2 + 3 H2O

What is the atomic number of Carbon?

• 7

• 6

• 12

• 5

Calculate the molar mass of NaCl.

• 56.12 g/mol

• 54.44 g/mol

• 60.00 g/mol

• 58.44 g/mol

Balance the equation: Fe + O2 → Fe2O3

• 2 Fe + O2 → Fe2O3

• 4 Fe + 3 O2 → 2 Fe2O3

• 4 Fe + 2 O2 → 2 Fe2O3

• 3 Fe + 2 O2 → Fe2O3

What is the symbol for Gold?

• Ag

• Fe

• Pb

• Au

Calculate the molar mass of C6H12O6.

• 200.18 g/mol

• 165.25 g/mol

• 180.16 g/mol

• 150.12 g/mol

Balance the equation: H2 + O2 → H2O

• 2 H2 + 2 O2 → 2 H2O

• H2 + O2 → 2 H2O

• H2 + O2 → H2O

• 2 H2 + O2 → 2 H2O

What is the atomic mass of Oxygen?

• 15.99 amu

• 17.01 amu

• 18.02 amu

• 16.00 amu

Calculate the molar mass of CaCO3.

• 100.09 g/mol

• 102.45 g/mol

• 98.00 g/mol

• 95.10 g/mol

Balance the equation: N2 + H2 → NH3

• N2 + 2H2 → NH3

• N2 + 4H2 → 3NH3

• N2 + H2 → NH4

• N2 + 3H2 → 2NH3