1. What mass of methane must be burned in order to liberate 11,524 kJ of heat? 2. A sample of Ammonia (NH3) liberates 4.94 kJ as it solidifies at its melting point. What is the mass of the sample?

3. A cooking gas cylinder is assumed to contain 6.7 kg of fuel gas (molar mass 58 g/mol). The heat of combustion of fuel gas is 2465 kJ/mol. A family needs 8 x 103 kJ of energy per day of cooking. Then how long would cylinder will last (approx.)? (Assume 29% of gas goes waste due to incomplete combustion).

4. How much heat is required to warm 142 g of ice from -40.0o C to 0.0o C, melt the ice. warm the water from 0.0o C to 100.0o C, boil the water, and heat the steam to 173.0o C?