If a system does 72 kJ of work and receives 13 kJ of heat, what is the value of

Question

If a system does 72 kJ of work and receives 13 kJ of heat, what is the value of delta U for this change? Select one: a. -85 kJ b. -59 kJ c. +85 kJ d. +59 kJ One thermochemical equation for the reaction of carbon monoxide with oxygen is: delta H degree = -566 kJ Determine delta H degree in kJ for the complete combustion of 36 kg of carbon monoxide. A 350.0 g sample of copper is initially at 25.0 degree C. It absorbs 12.50 kJ of heat from its surroundings. What is its final temperature, to the nearest tenth of a degree? (specific heat = 0.3874 J-g^-1 middot K^-1 for copper) Select one: a. 67.2 degree C b. 92.2 degree C c. 117.2 degree C d. 25.1 degree C

Explanation / Answer

Ans 1 du = dq + DW

du = 13 + 72

du = 8 5 kJ (ans c

Ans 2. For 56 g of CO combustion, H= -566 KJ

For 36000g, H = (-566/56) * 36000

Delta H = -363857 KJ

Ans 3) q = mc (T2-T1)

Putting all values, we get T2 = 117.2 C

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