A chemist has exactly formula units of copper(II) sulfate pentahydrate,

CHEMISTRY · Single correct · A Level · Chemistry · Amount of substance · Amount of substance

Problem

A chemist has exactly

0.750\,N_A

formula units of copper(II) sulfate pentahydrate,

\text{CuSO}_4\cdot5\text{H}_2\text{O}

. What is the mass of this sample expressed in kilograms? (a)

0.250\,\text{kg}

(b)

0.187\,\text{kg}

(c)

0.120\,\text{kg}

(d)

0.0935\,\text{kg}