A sample of zinc reacts completely with excess hydrochloric acid

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

Problem

0.65\,\text{g}

sample of zinc reacts completely with excess hydrochloric acid. The hydrogen gas produced is collected over water at

28^{\circ}\text{C}

and a barometric pressure of

765\,\text{mmHg}

. The collected volume of gas is

245\,\text{mL}

. The vapor pressure of water at

28^{\circ}\text{C}

28\,\text{mmHg}

. What is the percent yield of hydrogen for the reaction? (a) 83\% (b) 100\% (c) 96\% (d) 48\%