1. How much energy does it take to boil a gallon of liquid water that is already

Question

1.

How much energy does it take to boil a gallon of liquid water that is already at 100ºC? Express your answer in kJ. Just enter the numerical value - don't put units in this case. Enthalpy of vaporization of water = 2.25 kJ/g 1 Gallon = 3.785 L Water = 1.00 g/ml

2.

How much energy is required to heat a 12.00 g block of ice at -72.00 °C into steam at 100.00 °C? Express your answer in Joules.

-The specific heat of ice is 2.092 J/g°C
-The specific heat of water is 4.184 J/g°C

- The enthalpy of vaporization of water is 2.26 kJ/g
-The enthalpy of fusion for water is 0.334 kJ/g

Enter your answer in Joules (not kJ).

Explanation / Answer

Ans 1.

1 gallon of water = 3.875 L or 3875 mL

Since the density is 1g/mL so the mass of 1 gallon becomes 3875 g

The enthalpy of vapourization is 2.25 KJ/ g

So for 3875 grams it will be 2.25 × 3875 = 8718.75

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