Some Basic Concepts of Chemistry — Chemistry STD 11 Science — Question
Maharashtra BoardEnglish MediumSTD 11 ScienceChemistrySome Basic Concepts of Chemistry2 Marks
Question
How is molecular mass of a substance calculated? Give example.
✓
Answer
Molecular mass is calculated by multiplying average atomic mass of each element by the number of its atoms and adding them together. e.g. Molecular mass of carbon dioxide $\left(\mathrm{CO}_2\right)$ is calculated as follows: Molecular mass of $\mathrm{CO}_2=(1 \times$ average atomic mass of $\mathrm{C})+(2 \times$ average atomic mass of $\mathrm{O})$ $\begin{aligned}& =(1 \times 12.0 \mathrm{u})+(2 \times 16.0 \mathrm{u}) \\
& =44.0 \mathrm{u}\end{aligned}$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.