How many molecules are there in `3.46g` sample of hydrogen chloride `(HCl)`?

Options

A. `3.72xx10^(22)`
B. `4.87xx10^(22)`
C. `1.95xx10^(22)`
D. `3.786xx10^(22)g`

Answer

D

Explanation

`underset(HCl)("gram of")rarr underset(HCl)("moles of")rarr underset(HCl)("molecules of ")`
`3.46g HCl xx (1 mol CHl)/(36.5g HCl) xx (6.022xx10^(23) HCl "molecules")/(1 mol HCl)`
`= 5.72xx10^(22) HCl` molecules