3. Which compound has the greatest molar mass?

A. H2O B. C6H12O6 C. HNO3 D. C2H6

C₆H₁₂O₆ has the greatest molar mass (180 g/mol)

Given

Compounds of A. H2O B. C6H12O6 C. HNO3 D. C2H6

Required

The greatest molar mass

Solution

The molar mass(molecular mass-formula mass) of a compound is the sum of the relative atomic mass (Ar) of the constituent elements of the compound

A. H₂O : 2.1+16 = 18 g/mol

B. C₆H₁₂O₆ : 6.12+12.1+6.16=180 g/mol

C. HNO₃ : 1.1+1.14+3.16=63 g/mol

D. C₂H₆ : 2.12+6.1 = 30 g/mol