Ozone molecules in the stratosphere absorb much of the

Question

1. A flask contains 0.761 mol N₂, 0.179 mol O₂, 0.0310 mol He and 0.0260 mol H₂ at total pressure of 749 mm Hg. What is the partial pressure of O₂?

2. Ethanol burns in the air as described by the following equation, C₂H₅OH(l)  +   3 O₂(g)  →  2 CO₂(g)  +   3 H₂O(l). What volume of CO₂(g) would be produced if 227 g of ethanol (46.07 g/mol) was burned completely at 35°C and 1.1 atm?

3. Ozone molecules in the stratosphere absorb much of the harmful UV radiation from the sun.  Typically, the temperature and pressure of ozone in the stratosphere are -23 °C and 1.0 torr, respectively. How many moles of ozone are present in 100. L of air at this height?

4. If a steel container was filled with 5.0 atm of nitrogen gas at 21°C, what would the pressure be if the container was stored in a hot warehouse with a temperature of 38°C ?