Which of the following species has highest mass?

Which of the following species has highest mass?
  1. $1 \mathrm{~g}$ atom of carbon
  2. $3.011 \times 10^{23}$ atoms of oxygen
  3. $10 \mathrm{~mL}$ of water at room temperature
  4. $\frac{1}{2}$ mole of $\mathrm{CH}_4$

Solution

Mass of $1 \mathrm{~g}$ atom of carbon $=12 \mathrm{~g}$ $3.011 \times 10^{23}$ atoms of oxygen $=0.5 \mathrm{~mol}$ atom $\begin{aligned} & =0.5 \times 16=8 \mathrm{~g} \\ & 10 \mathrm{ml} \mathrm{H}_2 \mathrm{O}=10 \mathrm{~g} \mathrm{H}_2 \mathrm{O} \\ & \frac{1}{2} \mathrm{~mol} \mathrm{CH}_4=\frac{1}{2} \times 16=8 \mathrm{~g}\end{aligned}$

Asked in: MHT CET 2022 (07 Aug Shift 2)

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