what was the original volume of nitrogen if its initial pressure is 5.2atm before changing to a new pressure of 1.4atm 720C and now occupying 120 liters

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what was the original volume of nitrogen if its initial pressure is 5.2atm before changing to a new pressure of 1.4atm 720C and now occupying 120 liters
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what was the original volume of nitrogen if its initial pressure is 5.2atm before changing to a new pressure of 1.4atm 720C and now occupying 120 liters
what was the original volume of nitrogen if its initial pressure is 5.2atm before changing to a new pressure of 1.4atm 720C and now occupying 120 liters

what was the original volume of nitrogen if its initial pressure is 5.2atm before changing to a new pressure of 1.4atm 720C and now occupying 120 liters
题目当中那个720C是720摄氏度吗?如果是的话,那这个减压的过程应该是一个绝热过程
所以 V^(1+2/f) * P = V^(1+2/f) * P 这里 V是体积,P是气压,f是气体分子自由度
氮气在720度的自由度是5,
所以
V^(7/5)*5.2 = 120^(7/5)*1.4 →→ V=19.11(liter)
答:初始体积为19.11升

能写中文吗??英文不太好...

原有温度不知道吗?不用考虑吗?