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Suppose 1400 J of heat energy are put into a sample of liquid water at 23°C, and the final temperature of the water is 78°C. How many grams of water are present?

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q = mass H2O x specific heat H2O x (Tfinal-Tinitial)
1400 J = mass x 4.184 x (78-23)
mass H2O = ?

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