39. HNO3 and H2O form the following compounds: HNO3*3H2O and HNO3*H2O. The melting points of these compounds are respectively -17 and 39 0C. The coordinates of the eutectic points are as follows:
1) t= -43 0C, HNO3 concentration = 32% (mass)
2) t= -42 0C, HNO3 concentration = 70.5% (mass)
3) t= -66 0C, HNO3 concentration = 89.95% (mass)
Construct a fusibility chart, expressing the composition as a percentage. (mass)
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