Question

Calculate the formula unit mass of sugar (C 12 H 22 O 11)

Answer 1

Atomic mass of carbon = 12

Atomic mass of Hydrogen = 1

Atomic mass of oxygen = 16

So, mass of sugar = 12(12)+ 22(1)+11(16) = 342 grams

Answer 2

The formula unit mass of sugar is 342 amu

Explanation:

Formula mass is defined as the sum of the mass of all the atoms each multiplied its atomic masses that are present in the chemical formula of a compound. It is expressed in amu.

The chemical formula of sugar is $C_{12}H_{22}O_{11}$

We know that:

Atomic mass of carbon = 12 amu

Atomic mass of hydrogen = 1 amu

Atomic mass of oxygen = 16 amu

Formula mass of sugar = $(12\times 12)+(22\times 1)+(11\times 16)]=342amu$

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