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preface to fifteenth edition

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6.142 SECTION 6<br />

TABLE 6.4<br />

Heats of Fusion, Vaporization, and Sublimation and Specific Heat at Various Temperatures of<br />

the Elements and InorganicCompounds (Continued)<br />

C p<br />

Substance Hm Hv Hs<br />

400 K 600 K 800 K 1000 K<br />

Vanadium<br />

V 21.5 459 516 26.2 27.5 28.7 30.1<br />

VCl 4 2.30 41.4 42.5 161.7(lq) 100.1(g) 102.6 104.7<br />

VF 5 50.0 44.5<br />

VN, Hdec 227.6 2346 741 43.3 48.2 51.2 53.7<br />

VO 63 49.6 53.5 57.1 60.5<br />

VO 2 , Ht 4.21 72 56.9 67.2 74.3 77.8 80.2<br />

V 2 O 3 , Ht 1.623 104.3 117.2 117.5 127.3 132.6 138.0<br />

V 2 O 4 , Ht 9.0 67 112.1 135.3 148.4 155.5 160.7<br />

V 2 O 5 64.5 263.6 151.0 168.3 177.3 183.7<br />

VOCl 3 36.8<br />

Xenon<br />

Xe 1.81 12.64 20.79(g) 20.79 20.79 20.79<br />

Ytterbium<br />

Yb 7.66 159<br />

Yttrium<br />

Y, Ht 4.97 1485 11.42 365 425 27.3 28.5 29.9 31.5<br />

Y 2 O 3 , Ht 1.30 1057 105 113.3 121.3 124.7 126.9<br />

Zinc<br />

Zn 7.32 123.6 26.3 28.6(c) 31.4(lq) 31.4<br />

ZnBr 2 16.7 118 70.1(c) 78.8(lq) 113.8 61.5(g)<br />

ZnCl 2 10.25 126 69.9(c) 100.8(lq) 100.8 100.8<br />

ZnF 2 190.1 66.9 69.1 71.4 73.7<br />

ZnO, Ht 13.4 1020 52.3 49.4 52.4 54.1 55.5<br />

Zn 2 SiO 4 129.4 141.4 153.4 165.4<br />

ZnSO 4 , Ht 20.3 740 116.0 137.4 139.7 142.0<br />

Zirconium<br />

Zr, Ht 4.02 862 21.00 573 610.0 25.9 27.3 29.0 31.1<br />

ZrB 2 104.6 57.5 65.8 69.7 72.1<br />

ZrBr 2 63 131.5 230 87.9 90.2 92.5 94.8<br />

ZrBr 4 129.3 133.3(c) 107.2(g) 107.6<br />

ZrC 79.5 43.6 49.4 52.3 53.4<br />

ZrCl 2 27 45.0 76.0 80.0 83.1 85.9<br />

ZrCl 3 190 101 106 109 112<br />

ZrCl 4 50 110.5 125.4 131.1(c) 106.5(g) 107.1<br />

ZrF 2 33 289 404 70 76 81 84<br />

ZrF 4 64.2 237.7 113.5 124.0 129.4 134.1<br />

ZrI 2 25.1 113 95.0 96.6 106.1 123.6<br />

ZrI 3 176 105.9 106.7 107.1(c) 82.9(g)<br />

ZrI 4 126.4 131.0 134.6(c) 107.6(g) 107.6<br />

ZrN 67.4 44.8 48.7 50.9 52.7<br />

ZrO 2 , Ht 5.02 1205 87.0 624 63.9 70.2 73.5 75.7<br />

ZrSiO 4 114.6 133.7 142.7 147.3<br />

6.2 CRITICAL PHENOMENA<br />

The critical temperature, T c , of a gas is the temperature above which the gas cannot be liquefied no<br />

matter how high the pressure.

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