Question

Magnesium reacts with hydrochloric acid to produce hydrogen gas and magnesium chloride. What
volume of hydrogen gas is theoretically produced in cubic millimeters, if 4.9 g magnesium reacts
with excess hydrochloric acid? The reaction is taking place at 101.5 kPa pressure and 20°C.

Answer 1

using PV=mRT/Mr

V=(4.9×8.31×(273+20))/(24.3×101.5×10^3)

=4.84×10^-3 m^3

=4.84×10^6 mm^3