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7 October, 21:05

A 300.0 W immersion heater is used to heat 0.250 kg of water from 10.0 °C to 70.0 °C. About how many seconds did this take? (There are 4186 Joules per kcal.)

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  1. 7 October, 23:22
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    209.3 seconds

    Explanation:

    P = 300 W, m = 0.250 kg, T1 = 10 degree C, T2 = 70 degree C

    c = 4186 J / kg C

    Heat given to water = mass x specific heat of water x rise in temperature

    H = 0.250 x 4186 x (70 - 10)

    H = 62790 J

    Power = Heat / Time

    Time, t = heat / Power

    t = 62790 / 300 = 209.3 seconds
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