A 1.00-kg block of copper at 20.0°C

A 1.00-kg block of copper at 20.0°C is dropped into a large vessel of liquid nitrogen at 77.3 K. How many kilograms of nitrogen boil away by the time the copper reaches 77.3 K? (The specific heat of copper is 0.092 0 cal/g . °C. The latent heat of vaporization of nitrogen is 48.0 cal/g).

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