Q1 / 200 · Manipal (MET) 2011 · Chemistry

The largest number of molecules is in

  • Correct answer
    A
    36 g of water
  • B
    28 g of $\mathrm{CO}_2$
  • C
    46 g of $\mathrm{CH}_3 \mathrm{OH}$
  • D
    58 g of $\mathrm{N}_2 \mathrm{O}_5$

Solution

$\begin{aligned} & 36 \mathrm{~g} \text { of water }=\frac{36}{18}=2 \mathrm{~mol} \\ & 28 \mathrm{~g} \text { of } \mathrm{CO}_2=\frac{28}{44}=0.64 \mathrm{~mol} \\ & 46 \mathrm{~g} \text { of } \mathrm{CH}_3 \mathrm{OH}=\frac{46}{32}=1.44 \mathrm{~mol} \\ & 58 \mathrm{~g} \text { of } \mathrm{N}_2 \mathrm{O}_5=\frac{58}{108}=0.54 \mathrm{~mol}\end{aligned}$

Hence, the correct answer is option: 'A'.

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