Which one of the following is the lightest?

Question

Which one of the following is the lightest? (A) 0.2 mole of hydrogen gas (B) 6.023 × 1022 molecules of nitrogen (C) 0.1 g of silver (D) 0.1 mole of oxygen gas

Tardigrade Admin · Accepted Answer

Weight of H 2= mole × molecular wt. =0.2 × 2=0.4 g (b) 6.023 × 1023=1 mole Thus 6.023 × 1022=0.1 mole Weight of N 2=0.1 × 28=2.8 g (c) Weight of silver =0.1 g (d) Weight of oxygen =32 × 0.1=3.2 g

Q. Which one of the following is the lightest?

$0.2$ mole of hydrogen gas

$6.023 \times 1 0^{22}$ molecules of nitrogen

$0.1 g$ of silver

$0.1$ mole of oxygen gas

Weight of $H_{2} =$ mole $\times$ molecular wt.
$= 0.2 \times 2 = 0.4 g$
(b) $6.023 \times 1 0^{23} = 1$ mole
Thus $6.023 \times 1 0^{22} = 0.1$ mole
Weight of $N_{2} = 0.1 \times 28 = 2.8 g$
(c) Weight of silver $= 0.1 g$
(d) Weight of oxygen $= 32 \times 0.1 = 3.2 g$

Q. Which one of the following is the lightest?

0.2 mole of hydrogen gas

6.023×1022 molecules of nitrogen

0.1g of silver

0.1 mole of oxygen gas

Weight of H2​= mole × molecular wt. =0.2×2=0.4g (b) 6.023×1023=1 mole Thus 6.023×1022=0.1 mole Weight of N2​=0.1×28=2.8g (c) Weight of silver =0.1g (d) Weight of oxygen =32×0.1=3.2g

$0.2$ mole of hydrogen gas

$6.023 \times 1 0^{22}$ molecules of nitrogen

$0.1 g$ of silver

$0.1$ mole of oxygen gas

Weight of $H_{2} =$ mole $\times$ molecular wt.
$= 0.2 \times 2 = 0.4 g$
(b) $6.023 \times 1 0^{23} = 1$ mole
Thus $6.023 \times 1 0^{22} = 0.1$ mole
Weight of $N_{2} = 0.1 \times 28 = 2.8 g$
(c) Weight of silver $= 0.1 g$
(d) Weight of oxygen $= 32 \times 0.1 = 3.2 g$