Question

7. If the molar mass of the sugar in question 6 is 240.0 g, find the molecular formula of the sugar.Empirical formula of the sugar is CH2O

Answer 1

The molecular formula of the sugar is C₈H₁₆O₈

Step-by-step explanation

The empirical formula is CH2O

The empirical molar mass = (1 x 12.011 g/mol C) + ( 2 x 1.008 g/mol H) + (1 x 15.999 g/mol O) = 30.026 g/mol

To get the molecular formula, we shall divide the molecular mass by the empirical mass and then multiply the answer with subscript of the empirical formula.

molecular mass = 240.0 g

empirical molar mass = 30.026 g/mol

`\frac{\text{molecular mass}}{em\pi\text{rical mass}}=(240.0)/(30.026)=7.99\approx8`

Molecular formula = (CH₂O)₈ = C₈H₁₆O₈

The molecular formula of the sugar is C₈H₁₆O₈