A copper block of mass 1.01 kg at an initial temperature of 20.1°C is placed in an insulated container of liquid nitrogen at 77.2 K. What mass of nitrogen will boil off when the copper reaches 77.2 K? 'assume the specific heat of copper is 0.0920 cal and the latent heat of vaporization nitrogen g• °C cal is 48.0 g

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