15g sample of an alloy containing Cu (at mass 63.6) and Zn reacts completely with 3M…

CHEMISTRY · Subjective · A Level · Chemistry · Amount of substance · Amount of substance

Problem

15g sample of an alloy containing Cu (at mass 63.6) and Zn reacts completely with 3M

HNO_3

as :

Cu + HNO_3 \longrightarrow Cu^{2+} + NO_2(g) + H_2O

Zn + HNO_3 \longrightarrow Zn^{2+} + NH_4^+ + H_2O

The liberated

NO_2(g)

was found to occupy 4.647 litre at 1 atm and 300 K. The mass of Zn (to the closest value) in alloy is .....