Statement 1: Weight of 1 molecule of O_2 is 32 u. Statement 2: 1 g molecule = 6.023 10^ 23 molecules.

JEE Main Chemistry question

Statement 1: Weight of 1 molecule of O is 32 u.

Statement 2: 1 g molecule = molecules.

(A)Statement 1 is True, Statement 2 is True; Statement 2 is correct explanation for Statement 1
(B)Statement 1 is True, Statement 2 is True; Statement 2 is not correct explanation for Statement 1Correct
(C)Statement 1 is True, Statement 2 is False
(D)Statement 1 is False, Statement 2 is True

Answer: (B)

Solution

The molecular weight of O is 32 u, which is exactly the mass of one molecule expressed in atomic mass units (Statement 1, true). Statement 2 correctly defines a gram-molecule (1 mole) as

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Question ID VK-130652