Question

1. What is the value of ΔE in a system wherein a car engine that releases heat pushing the piston, doing 451 J of work and losing 325 J to the surroundings?

2. What is the specific heat of a metal whose mass is 94.5 g if the temperature changes from 250°C to 48°C when it absorbs 850 J of heat?

3. A 4.4-g compound is burned in a bomb calorimeter whose total heat capacity is 7.854 kJ/°C. A temperature change of 7.13°C occurred. What is the heat of combustion per gram of the compound?

Answer 1

1.=126J

2.c = 0.0445 J/ (g .°C)

3.Heat of combustion=$-3500kJ/mol$