Question

Which of the following has the highest mass ?

• A. 20 g of sulphur
• B. 4 mol of carbon dioxide
• C. $12 \times 10^{24}$ atoms of hydrogen
• D. 11.2 L of helium at N T.P

Answer 1

Answer: (B)

4 mol of carbon dioxide

Answer 2

Molar mass of $CO_{2}=44\,g\,mol^{-1}$ $\therefore$ 4 mol of $CO_{2}=44\times4 = 176\,g$ (C) $6.02\times 10^{23}$ atoms of hydrogen has mass $=1.008\,g$ $12\times 10^{24}$ atoms of hydrogen has mass $=20.1\,g$ (D) $22.4\,L$ of helium at $N.T.P.$ has mass $= 4\, g$ $11.2\, L$ of helium at $N.T.P.$ has mass $= 2\, g$ Thus $4$ moles of $CO_{2}$ has maximum mass