亚硝酸与肼的反应热测定
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摘要
采用C80微量热仪测定了亚硝酸与肼的反应热,得到了亚硝酸与肼以不同量比进行反应时的摩尔反应热:亚硝酸与肼的量比大于2时,消耗单位摩尔肼的反应放热量ΔE_1=-284.41 kJ/mol;亚硝酸与肼的量比小于1时,消耗单位摩尔亚硝酸时的反应放热量ΔE_2=-166.7 kJ/mol;亚硝酸与肼的量比介于1和2之间时,消耗单位摩尔肼的反应放热量介于ΔE_1和ΔE_2之间,且ΔE_1所占百分比随该比值的增加呈线性增长,其线性关系为m=1.115 5n-1.147,R_2=0.992,其中n为亚硝酸与肼的量比(1The reaction heat of nitrous acid and hydrazine is investigated using micro calorimeter C80.The results show the change of the reaction heat per mole of nitrous acid with hydrazine by different proportions:when the consistence of nitrous acid is more than double consistence of hydrazine,the reaction heat per mole of hydrazine,ΔE_1 =-284.41 kJ/mol;when the consistence of nitrous acid is less than the consistence of hydrazine,the reaction heat per mole of nitrous acid,ΔE_2=-166.7 kj/mol;when the ratio of them is between 1 and 2,the reaction heat per mole of hydrazine is between ΔE_1 and ΔE_2,and the percent of ΔE_1(denoted by m) is linear increasing with the proportion of nitrious acid to hydrazine(denoted by n) according to the following equation:m =1.115 5n-1.147,R_2=0.992.The reaction heat per mole according as the consistence of hydrazine is calculated according to the following equation:ΔE_3 = ΔE_1 · m+ΔE_2 ·(1-m).
引文
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