Question

Which of the following weighs the least?

(a) 0.2 g atoms of N (at. wt. of Na = 14)

(b) 3 x 10²³ atoms of C (at. wt. of C = 12)

(c) 1 mole of S (at. wt. of S = 32) 

(d) 7 g silver (at. wt. of Ag = 108)

Answer 1

Correct option is (a) 0.2 g atoms of N (at. wt. of Na = 14)

Weight of nitrogen = 0.2 x 14 = 2.8 g

Weight of carbon = \(\frac{12 \times 3 \times 10^{23}}{6 \times 10^{23}}\) = 6g

Weight of sulphur = 1 x 32 = 32 g

Weight of silver = 7 g