Calculation

How to calculate molar mass of H₂O?

• 2+16=18
• 1+16=17
• 2+32=34
• 1+31=32

What is the molar mass of CO₂?

• 12 g/mol

• 16 g/mol

• 32 g/mol

• 44 g/mol

Find the percentage composition of Mg in Mg₃(PO₄)₂.

• 27.48% Mg

• 43.11% Mg

• 16.00% Mg

• 12.63% Mg

What is the percent by mass of sodium in NaCl?

• 39%
• 61%
• 35%
• 65%

What is the mass percentage of Carbon in Carbon dioxide (CO₂)?

• 27.27%

• 42.86%

• 72.73%

• 72.72%

Find the molar mass of KCl

• 36 g/mol
• 78 g/mol
• 74 g/mol
• 178 g/mol

Work out relative molecular mass of HCl

Work out relative molecular mass of nitric acid.

HNO₃

Work out relative molecular mass of H₂S.

Work out relative molecular mass of SO₃.