Chemistry
Which of the following weighs the least?
(a) 2 g atom of N
(b) 3 x 1025 atoms of carbon
(c) 1 mole of sulphur
(d) 7 g of silver
Mole Concept
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Answer
7 g of silver
Reason —
(a) Weight of 1 g atom of N = 14 g
∴ weight of 2 g atom of N = 28 g
(b) 6.022 × 1023 atoms of C weigh = 12 g
∴ 3 × 1025 atoms will weigh = × 3 × 1025 = 597.7 g
(c) 1 mole of sulphur weighs = 32 g
(d) 7 g of silver
The weight computed in all other options is greater than the weight in option (d). Hence, 7 grams of silver weighs the least.
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