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5 July, 19:15

A piece of gold with a mass of 15.23 g and an initial temperature of 54 °C was dropped into a calorimeter containing 28 g of water. The final temperature of the metal and water in the calorimeter was 62°C. What was the initial temperature of the water?

31.03 °C

62.13 °C

81.03°C

92.13°C

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  1. 5 July, 19:24
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    A piece of gold with a mass of 15.23 g and an initial temperature of 54 °C was dropped into a calorimeter containing 28 g of water. The final temperature of the metal and water in the calorimeter was 62°C. this can be solve using the formula H = mCpDeltaT where m is the mass, Cp is the heat capacity, delta T is the change in temperature

    Cp of gold = 0.129 J / g °C

    Cp of water = 4.18 J / g °C

    The H for both are equal, so equate them and solve for the initial T of water

    (15.23g) (0.129 J / g C) (62 °C - 54 °C) = (28 g) (4.18 J / g °C) (Ti - 62 °C)

    Ti = 62.13 °C
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