Which of the following is a balanced equation for this reaction? a. al + hcl ? alcl3 + h2 b. al + 3hcl ? alcl3 + h2 c. al + 3hcl ? alcl3 + 3h2 d. 2al + 6hcl ? 2alcl3 + 3h2

Place me with this question is my last question

What accounts for an increase in the temperature of a gas that is kept at constant volume? a. energy has been removed as heat from the gas. b. energy has been added as heat to the gas. c. energy has been removed as work done by the gas. d. energy has been added as work done by the gas.

Refrigerant-134a flows through a carnot heat pump cycle at 0.5 kg/s. it is known that the maximum absolute temperature in the cycle is 1.1 times the minimum absolute temperature, and the net power input to the cycle is 2.5 kw. if the refrigerant changes from a saturated vapor to a saturated liquid during the heat rejection process, determine the maximum magnitude of the enthalpy of vaporization for this process in kj/kg (with 3 significant figures).