How many joules of energy are needed to change 275 g of water from 15°C to steam at 100.°C?

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  1. q1 = heat needed to raise T from 15 C to 100 C.
    q1 = mass H2O x specific heat H2O x (Tfinal-T(intial)

    q2 = heat need to change liquid H2O to vapor.
    q2 = mass H2O x heat vaporization
    Total Q = q1 +q2

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