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15 September, 07:49

A sample of water with a mass of 622.7g undergoes a temperature change from 90.98°C

to 96.70°C. What is the heat change in Joules? Cwater=4.18J/g°C

A) 0251608.10

B) 3561.8J

C) 14888.5)

D) 2.51X105)

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Answers (1)
  1. 15 September, 09:19
    0
    C) Q = 14888.5 J

    Explanation:

    Q = mCΔT

    ∴ m H2O = 622.7 g

    ∴ C H2O = 4.18 J/g°C

    ∴ ΔT = 96.7°C - 90.98°C = 5.72°C

    ⇒ Q = (622.7 g) (4.18 J/g°C) (5.72°C)

    ⇒ Q = 14888.508 J
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