How many joules of heat are absorbed when 70.0 grams of water is completely vapourised at its boiling point?

23.352

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15.813

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158200

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Solution

The correct option is D 158200
Quantity of water = 70g or 0.07kg water.

At a standard atmosphere, the heat of vaporization is = 2260.00 kJ/kg.

Thus following the equation;

E = Quantity $\times$ heat. = 70g

E = 70 $\times$ 2260 = 158200.

Thus, the joules of heat absorbed when 70.0 grams of water is completely vaporised at its boiling point are 158,200.

So, the correct option is D

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