Densities, Apparent Molar Volume, Expansivities, Hepler’s Constant, and Isobaric Thermal Expansion Coefficients of the Binary Mixtures of Piperazine with Water, Methanol, and Acetone at T = 293.15 to 328.15 K

Table 4

Apparent molar volume (m³/mol) of the binary mixtures (piperazine + water), (piperazine + methanol), and (piperazine + acetone) as a function of the molality and temperature at atmospheric pressure with the standard uncertainty: u (V_ϕ) = ±0.35 × 10⁻⁶ m³/mol.

Temperature (K)	293.15	298.15	303.15	308.15	313.15	318.15	323.15	328.15
Molality (mol/kg) of piperazine	Binary system apparent molar volumes 10^6 × Vϕ (m^3/mol)
System (piperazine + water)
0.9838	—	85.02	85.16	85.32	85.49	85.67	85.88	86.13
3.0226	—	85.43	85.57	85.72	85.89	86.08	86.28	86.50
6.4138	—	85.37	85.52	85.68	85.87	86.06	86.27	86.50
System (piperazine + methanol)
0.6978	75.02	75.24	75.50	75.84	76.07	76.38	77.32	78.39
1.4000	76.96	77.05	77.18	77.15	77.48	77.97	78.69	79.32
2.2148	77.69	77.84	78.02	78.13	78.44	78.83	79.39	79.88
3.0544	78.29	78.46	78.65	78.78	79.11	79.48	79.98	80.41
3.7151	78.48	78.66	78.86	79.03	79.31	79.67	80.11	80.49
5.1007	79.49	79.70	79.93	80.13	80.30	80.66	81.07	81.45
5.9003	79.61	79.82	80.04	80.24	80.54	80.90	81.29	81.68
7.4725	80.52	80.75	81.00	81.23	81.55	81.89	82.29	82.68
9.2198	80.69	80.92	81.18	81.43	81.77	82.11	82.47	82.84
14.007	82.43	82.71	83.01	83.31	83.66	84.07	84.55	84.93
System (piperazine + acetone)
0.3478	97.37	98.38	99.39	102.11	104.76	107.33	110.96	—
0.8416	95.20	95.88	96.72	98.09	99.43	100.86	102.50	—
1.0951	94.14	94.91	95.75	97.22	98.65	100.24	101.94	—
1.3359	92.75	92.69	94.15	95.49	96.78	98.16	99.71	—
1.8834	92.02	92.32	93.37	94.36	95.06	95.77	96.69	—