Dalton’s Law states that the total pressure inside a container is obtained by adding all the partial pressures of each non-reacting gas.
726.22 mm Hg
Ideal gas equation: moles H2
mass = moles x molar mass
The zinc in a copper-plated penny will dissolve in hydrochloric acid if the copper coating is filed down in several spots (so that the hydrochloric acid can get to the zinc). The reaction between the acid and the zinc is:
2H+ (aq) + Zn (s) → H2 (g) + Zn2+ (aq)
When the zinc in a certain penny dissolves, the total volume of gas collected over water at 25 o C was 0.955 L at a total pressure of 750 mm Hg.
What mass of hydrogen gas was collected?
Frequently Asked Questions
What scientific concept do you need to know in order to solve this problem?
Our tutors have indicated that to solve this problem you will need to apply the Collecting Gas Over Water concept. If you need more Collecting Gas Over Water practice, you can also practice Collecting Gas Over Water practice problems.