Question

Statement 1: A molecule of butane, $C_4 H_{10}$ has a mass of $58.12$ amu.
Statement 2 : One mole of butane contains $6.022 \times 10^{23}$ molecules and has a mass of $58.12 \,g$.

• A. If both Statement $1$ and Statement $2$ are true and the statement $2$ is the correct explanation of the statement $1$
• B. If both Statement $1$ and Statement $2$ are true but statement $2$ is not the correct explanation of the statement $1$
• C. If Statement $1$ is true but Statement $2$ is false
• D. If Statement $1$ is false but Statement $2$ is true

Answer 1

Answer: (A)

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.