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30 November, 01:26

A) It takes 47.0J to raise the temperature of an 10.7g piece of unknown metal from 13.0∘C to 25.0∘C. What is the specific heat for the metal?

b) The molar heat capacity of silver is 25.35 J/mol⋅∘C. How much energy would it take to raise the temperature of 10.7g of silver by 15.2∘C?

c) What is the specific heat of silver?

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  1. 30 November, 01:39
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    The heat Q can be evaluated as:

    Q=mcΔT

    where:

    m is the mass

    c specific heat

    ΔT change in temperature.

    So:

    a)

    47=10.7c (25-13)

    c=0.39 J/g°C

    Using the same idea you get (I transformed g into moles using the molar mass of silver from the table of elements):

    b) Q = (10.7/107.9) * 25.35*15.2=38.21 J

    where: Molar mass of Ag = 107.8682 g/mol

    c) 38.21=10.7c15.2

    c=specific heat of silver=0.235 J/g°C
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