How much heat is required to convert 5.0 kg of ice from a temperature of – 20 0C to water at a temperature of 205 0F

Question

How much heat is required to convert 5.0 kg of ice from a temperature of – 20 0C to water at a temperature of 205 0F

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Bình An 6 months 2021-08-04T13:05:38+00:00 1 Answers 3 views 0

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  1. linhdan
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    2021-08-04T13:07:35+00:00
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    Answer:

    Explanation:

    To convert from °C to °F , the formula is

    ( F-32 ) / 9 = C / 5

    F is reading fahrenheit scale and C is in centigrade scale .

    F = 205 , C = ?

    (205 – 32) / 9 = C / 5

    C = 96°C approx .

    Let us calculate the heat required .

    Total heat required = heat required to heat up the ice at – 20 °C  to 0°C  + heat required to melt the ice + heat required to heat up the water at  0°C to

    96°C.

    =  5 x 2.04 x (20-0) +  5 x 336 + 5 x ( 96-0 ) x 4.2  kJ .

    = 204 + 1680 + 2016

    = 3900 kJ .

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )