# Chemistry 22

1. What is the Kelvin temperature of a system in which 4.50 mol of a gas occupy 0.250 L at 4.15 atm?

2. In the lab, students generated and collected hydrogen gas according to the following equations:
Zn + H2SO4---> H2 + ZnSO4
a) How many mL of hydrogen gas at STP were generated from 52.7 g of zinc metal?
b) If 525 mL of hydrogen gas at STP were needed, how many moles of H2SO4 would be required?

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1. Use PV = nRT for #1.
The next two are stoichiometry problems. Just follow the steps in the link below.
http://www.jiskha.com/science/chemistry/stoichiometry.html

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