Assertion :A molecule of butane, $C_{4} H_{10}$ has a mass of 58.12 amu. Reason: One mole of butane contains $6.022 \times 10^{23}$ molecules and has a mass of 58.12 g.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
A molecule of butane, $C_{4} H_{10}$ has a mass of 58.12 amu. Thus, butane has molar mass of 58.12 g/mol.
One mole of butane contains $6.022 \times 10^{23}$ molecules (avogadro's number) and has a mass of 58.12 g.
Thus, Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Assertion :A molecule of butane, C4H10 has a mass of 58.12 amu. Reason: One mole of butane contains 6.022×1023 molecules and has a mass of 58.12 g.

Assertion :A molecule of butane, $C_{4} H_{10}$ has a mass of 58.12 amu. Reason: One mole of butane contains $6.022 \times 10^{23}$ molecules and has a mass of 58.12 g.