Question

Question #7bc7d

Answer 1

`169.2`g

Explanation:

One mole of any substance has a mass equal to the substance's relative formula/atomic mass.
Calcium has a relative atomic mass of 40, so 4.23 moles would have a mass of `40xx4.23=169.2`g

Hope this helps; ket me know if I can do anything else:)

Answer 2

n (no. of moles) = given mass(m)/ molecular mass(M)

Explanation:

so 4.23 moles= reqd mass/ 40 ( molecular mass of Ca=M=40g)
so m= 4.23*40=169.2 g ( ans)
.........................hope it helps......................................:)