What occurs when the temperature of 10.0 grams of water is changed from 15.5°C to 14.5°C?

NetherCraft 0

1. The water absorbs 42 joules.

2. The water releases 42 joules.

3. The water absorbs 4200 joules.

4. The water releases 4200 joules.

4 Answers

  • Q = m*Cp*(del T)

    Where m = mass

    cp = specific heat capacity = 4.1855 J g–1 K–1 at 15 deg C

    del T = temp change = 14.5-15.5 = – 1 deg C

    there fore,

    Q = 10*4.1855*-1 = – 41.855 J

    Hence 42 joules will be release by water when temp is decrease from 15.5 to 14.5 deg C.

  • 2

  • The specific heat capacity of water is approximately 4.2 kilojoules per kilogram per Kelvin. 1 degree Celsius is equivalent to 1 Kelvin.

    In your example you have 0.01 kilograms of water and a -1 degree temperature change. So multiply 4.2 kilojoules by 0.01 and -1 to get -42 joules. In other words 42 kilojoules is released (answer 2).

  • ask google.

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