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用RD—1型热导式自动量热计测定了25℃KCl在水中(1mol、KCl:200mol、H_2O)的溶解热ΔHs=17.57±0.41kJ/mol。此值与文献值[4]相一致。用该仪器测定了Pr(NO_3)_3·6H_2O在水中(0.2m～0.05m)的溶解热,推出了溶解热与浓度关系的经验公式,并计算了Pr(NO_3)_3·6H_2O的标准生成热ΔH_f~0=—3078kJ/mol。
The heat of solution ΔHs of 25 ℃ KCl in water (1mol, KCl: 200mol, H_2O) was measured by RD-1 thermal conductivity automatic calorimeter ΔHs = 17.57 ± 0.41kJ / mol. This value is consistent with the literature value [4]. The heat of solution of Pr (NO_3) _3 · 6H_2O in water (0.2m ~ 0.05m) was measured by this instrument. The empirical formula for the relationship between heat of solution and concentration was deduced and the standard heat of formation of Pr (NO_3) _3 · 6H_2O ΔH_f ~ 0 = -3078 kJ / mol.