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20 October, 18:03

Calculate the energy needed to change 10 grams of water from 70°C to 110°C. 0.35 kcal

5.7 kcal

350 kcal

5700 kcal

+5
Answers (1)
  1. 20 October, 19:26
    0
    0.44kcal

    Explanation:

    Heat energy needed can be calculated using H = mc∆t where;

    m is the mass of the object = 10g = 0.01kg

    c is the specific heat capacity of the object = 4600J/kgK

    ∆t is the change in temperature = 110°C - 70°C = 40°C

    H = 0.01*4600*40

    H = 1840Joules

    Since 1joule = 0.000239kcal

    1840joules = 0.000239*1840

    = 0.44Kcal
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