Two physics and chemistry problems; seeking help from experts
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As follows, there are two questions related to physical chemistry*; could someone experienced help me out? 1. Assume that nitrogen expands from 40 atmospheres (absolute pressure) to 5 atmospheres (absolute pressure), with an expansion ratio of 8; as a result, the temperature of nitrogen drops from -100°C to -124°C. At the same expansion ratio, what should be the exit nitrogen temperature when the nitrogen inlet temperature is +20°C? A: -4℃ B: -10℃ C: +13℃ 2. Assuming nitrogen expands from 40 atmospheres (absolute pressure) to 5 atmospheres (absolute pressure), with an expansion ratio of 8, its temperature drops from -90℃ to -176℃. At the same expansion ratio, what should be the exit nitrogen temperature when the nitrogen inlet temperature is +20°C? A:-113℃ B:-66℃ C:-52℃
C/A bar! ! ! ! ! ! ! !
This post was last edited by Higee on 2015-8-5 at 12:53. Why is it still necessary to reply? Using the ideal gas law, the result for the first question is -20°C, and for the second question it is -117.7°C. I’m not sure if these are correct