A molecule of butane has a mass of $58.12 amu$ .
One mole of butane contains $6.022 \times 10^{23}$ molecules and has a mass of $58.12 g$ .

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Both (A) and (R) are true but (R) is not the correct explanation of (A)

Both (A) and (R) are true and (R) is the correct explanation of (A)

Both (A) and (R) are false

(A) is true but (R) is false

answer is A.

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Detailed Solution

One mole of butane, which comprises $6.022 \times 10^{23}$ molecules, has a mass of 58.12 g, hence a butane molecule $C_{4} H_{10}$ , has a mass of 58.12amu.
Hence, option A is correct.

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