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20 January, 14:24

How much energy must be added to a bowl of 125 popcorn kernels in order for them to reach a popping temperature of 175°C? Assume that their initial temperature is 21°C, that the specific heat of popcorn is 1650 J/kg°C and that each kernel has a mass of 0.0001 kg

a) 124 J

b) 1200 J

c) 3176 J

d) 44210 J

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Answers (1)
  1. 20 January, 15:02
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    c) 3176 J

    Explanation:

    mass of 125 popcorn = 125 x. 0001 =. 0125 kg

    increase in temperature = 175 - 21 = 154°C

    specific heat of popcorn = 1650

    heat required to increase temperature

    = mass of popcorn x increase in temperature x specific heat

    =.0125 x 154 x 1650

    = 3176.25 J
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