Assignment:
Question 1. For the reaction
2 NO(g) + O2(g) → 2 NO2(g)
DH° = -126.0 kJ at 25°C.
(a) Calculate the amount of heat transferred when 333 g of NO(g) reacts with O2(g) at 25°C and 1 atm.
(b) Does this heat flow into the system or does it flow to the surroundings?
(c) Is this reaction exothermic or endothermic?
Question 2. If 8675 J of heat flows into 135.0 g of water initially at 20.0°C, find the final temperature of the water. The specific heat of water is 4.18 J g^-1 K^-1.
Question 3. Find the molecular weight of a gas if 22.24 g of the gas in a 7045 cm^3 container at 20°C exerts a pressure of 698 torr.
Question 4. Calculate DH° at 25°C is -1790 kJ for the reaction
C3H6O(l) + 4O2(g) → 3 CO2(g) + 3 H2O(l)
Given these f DH ° values at 25°C: -394 kJ/mol for CO2(g), -286 kJ/mol for H2O(l), and 0 for O2(g), find f DH ° for C3H6O(l).
Question 5. What volume of H2(g) at 27°C and 1.08 atm is produced when 45.3 g of Al reacts as follows:
2Al + 6HNO3(aq) → 2Al(NO3)3 + 3H2
Provide complete and step by step solution for the question and show calculations and use formulas.