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 ?