What mass of contains the same number of atoms as in g-atom of oxygen?

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

Problem

What mass of

\text{NH}_3

contains the same number of atoms as in

4

g-atom of oxygen? (1)

17\,\text{g}

(2)

68\,\text{g}

(3)

42\,\text{g}

(4)

34\,\text{g}