Hydrazine perchlorate vapor pressure

The vapor pressure values obtained from the data of Table I by letting a — 1 and M = 66 (the average for hydrazine and perchloric acid -(vide infra) are tabulated in Table II and plotted as the Clausius-Clapeyron expression in Figure 1. [Pg.64]

The standard entropy of vaporization for liquid hydrazine perchlorate calculated from the vapor pressure expression is 64 cal./deg. mole. Although values for the standard entropies of gaseous hydrazine and perchloric acid are known, the value for hydrazine perchlorate is not, and hence it is not possible to compare the above experimental figure with a calculated figure. It is possible to compare it with another case where the entropy of vaporization is known and would be expected to have a comparable value. Ammonium perchlorate has been selected for this purpose. [Pg.66]

The experimental value (12) determined from vapor pressure measurements is 71.0 cal./deg. mole.) The entropy of fusion of hydrazine perchlorate may be calculated from the cited heat of fusion and the melting point and is found to be 9 cal./deg. mole. Thus the entropy change for the process... [Pg.66]

A final point is worth noting in comparing ammonium perchlorate and hydrazine perchlorate. The experimentally determined vapor pressure expression for the former (12) is... [Pg.66]

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