The high heat capacity of water is ecologically benign because it stabilizes the temperature of lakes and oceans : a large quantity of energy must be lost or gained before there is a significant change in temperature. Conversely, it means that a lot of energy must be supplied through heating to achieve a large rise in temperature. The molar heat capacity of waer is 75.3jK-1mol-1. What energy is needed to heat 250g of water (a cup of coffee, for insatnce) through 40oC

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