Laborakory Mamsnal for Gemeral Organic and Biological Chemis

Laborakory Mamsnal for Gemeral, Organic, and Biological Chemistry bed by the wiaer heated from IS \"C to S \"C. How many kilojoules were 04 How many kilojoules are required at 0 °C to melt an ice cube with a mass of 25 8 Q5 How many kilojoules are required to melt 15 g of ice at 0 °C, and raise the temperature of the liquid that forms to 85 °C?

Solution

Q.3 apply the equation

Heat = mass x heat capacity x (Final Temp - Initial Temp)

Heat capacity of water is 4.18 J / g C

Heat = 175 grams * 4.18 J / g C * (88 - 15) = 53, 399.5 Joules or

53.4 kilojoules

Q.4.

latent heat of water is 334 J / grams

Heat = mass * latent heat = 25 * 334 = 8350 joules or

8.35 kilojoules

Q.5.

Calculate the heat to melt the ice

Heat = 15 * 334 = 5010 joules

Heat to raise water temperature

Heat = 15 * 4.18 * (85 - 0) = 5329.5 joules

Heat = 5010 + 5329.5 = 10339.5 joules or 10.339 kilojoules

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