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A 1-kg block of copper at 20°C is dropped into a large vessel of liquid nitrogen...

A 1-kg block of copper at 20°C is dropped into a large vessel of liquid nitrogen at 77K. How many kilograms of nitrogen boil away by the time the copper reaches 77K? (The specific heat of copper is 0.092 cal/g·°C. The heat of vaporization of nitrogen is 48 cal/g.)

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oven d ata o. D 92 X4.18국 latent heat vapari2ahn y4al/1 lo itroeh =m 83203.2 Nl 9泌 Note we,185and divide by

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