"Published in Newark, California, USA"
A sample of pure zinc metal reacts completely with an excess of hydrochloric acid. The hydrogen gas produced is collected over water at 25°C and 1 atm. If the metal weighs 253.02 mg, how much hydrogen gas is collected?
Solution:
Consider the chemical reaction of pure zinc metal with hydrochloric acid to form hydrogen gas collected over water as follows
From the chemical reaction above, the number of moles of hydrogen gas collected over water is
The absolute temperature of oxygen gas is
The universal gas law constant for mL, mgmole, K, and atm is
.Therefore, by Ideal Gas Law, the amount of hydrogen gas collected over water
