Question

Match the mass of elements given in column I with the no. of moles given in column II and mark the appropriate choice.

Answer 1

A. Atomic mass of $He=4g$

Number of moles $=\frac{mass}{atomicmass}$

$n=\frac{28}{4}=7$ moles

B. Atomic mass of $Na=23g$

Number of moles $=\frac{mass}{atomicmass}$

$n=\frac{46}{23}=2$ moles

C.Atomic mass of $Ca=40g$

Number of moles $=\frac{mass}{atomicmass}$

$n=\frac{60}{40}=1.5$ moles

D.Atomic mass of $Al=27g$

Number of moles $=\frac{mass}{atomicmass}$

$n=\frac{27}{27}=1$ mole