48. What is the final temperature (in o C) of a 37.9 g sample of aluminum (speci

Question

48. What is the final temperature (in oC) of a 37.9 g sample of aluminum (specific heat = 0.900 J/(g K)) which absorbs 86.2 kJ of heat when it warms from 71oC?

49. A new substance evolves (-2.09) kJ of heat when 17.13 g it cools from 141.9oC to 15.3oC. What is the specific heat (in J/(g K)) of this substance?

50. An 33.24 g sample of aluminum is placed on a 72.03 g sample of copper initially at 87.62oC. If the heat is only transferred between the metals (with no loss to the surroundings) and the final temperature of both metals is 52.56oC, what is the inital temperature (in oC) of aluminum?

51. How much heat (in kJ) is evolved (under standard conditions) when 149.52 g of copper reacts to form copper(II) oxide?

52. How much heat (in kJ) is evolved when 92.78 g of water cools and freezes from 70.08oC to 0oC?

53. What is the change in enthalpy (in kJ) under standard conditions when 8.849 g of ethane is combusted?

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Explanation / Answer

48)

we have:

Q = 86.2 KJ = 86200 J

m = 37.9 g

C = 0.9 J/g.oC

Ti = 71 oC

we have below equation to be used:

Q = m*C*(Tf-Ti)

86200.0 = 37.9*0.9*(Tf-71.0)

Tf -71.0 = 2527 oC

Tf = 2598 oC

Answer: 2598 oC

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