MCQ
Which of the following has minimum number of atoms
- A$12\, g\, He$
- B$1.8\, g\, water$
- C$22\, g\, CO_2$
- ✓$2.45\, g$ sulphuric acid
✓
Answer
Correct option: D.
$2.45\, g$ sulphuric acid
d
$\mathrm{He} \Rightarrow \frac{12}{4}=3\, \mathrm{mol}$ atoms, $\mathrm{H}_{2} \mathrm{O} \Rightarrow \frac{1.8}{18}=0.1 \,\mathrm{mol}$
$\mathrm{He} \Rightarrow \frac{12}{4}=3\, \mathrm{mol}$ atoms, $\mathrm{H}_{2} \mathrm{O} \Rightarrow \frac{1.8}{18}=0.1 \,\mathrm{mol}$
$0.1 \times 3=0.3\, \mathrm{mol}$ atom
$\mathrm{CO}_{2} \Rightarrow \frac{22}{44}=0.5\, \mathrm{mol}: 0.5 \times 3=1.5\,\mathrm{mol}$ atoms
$\mathrm{H}_{2} \mathrm{SO}_{4} \Rightarrow \frac{2.45}{98}=0.025\, \mathrm{mol}: 0.025 \times 7=0.175 \,\mathrm{mol\,atoms}$
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