Int.Science

How much energy is needed to heat and melt 3.0 kg of copper initially at 83°C?
Be mindful of significant figure rules for both multiplication and addition.

450 kcal

430 kcal

280 kcal

130 kcal

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  1. q1 = heat needed to raise T Cu from 83 C to it's melting point (you will look that up) is
    q1 = mass Cu x specific heat Cu x (Tfinal-Tinitial) where Tf is the melting point and Ti is 83C.

    q2 = heat needed to melt Cu at its melting point is
    q2 = mass Cu x heat fusion
    You will need to look up the heat fusion for Cu.
    Then qtotal = q1 + q2
    Post your work if you get stuck.

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  2. ok, thank you. :)

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