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preface to fifteenth edition

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6.134 SECTION 6<br />

TABLE 6.4<br />

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

the Elements and Inorganic Compounds (Continued)<br />

C p<br />

Substance Hm Hv Hs<br />

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

NiWO 4 138.9 144.6 150.3 155.9<br />

Niobium<br />

Nb 30 689.9 726 25.4 26.3 27.2 28.0<br />

NbBr 5 24.0 50.2 112.5 147.9(c) 147.9(lq)<br />

NbCl 5 38.3 52.7 170.7(c) 127.9(g) 129.8 130.7<br />

NbF 5 12.2 52.3 43.5(lq)<br />

NbI 5 37.7 58.6 182.0(c)<br />

NbN, Ht 4.2 1370 46.0 45.4 49.9 51.6 53.2<br />

NbO 85 618 44.0 47.2 49.5 51.5<br />

NbO 2 , Ht 3.42 817 92 598.0 63.5 71.7 70.5 87.5<br />

Nb 2 O 5 104.3 145.0 160.7 170.0 175.5<br />

Nitrogen<br />

N 2 , Ht 0.230 237.53 0.720 5.577 29.2 30.1 31.4 32.7<br />

NF 3 11.6 61.9 71.4 76.0 78.4<br />

N 2 F 2 cis 15.4 91.6 58.2 68.3 73.6 76.6<br />

trans 14.2 87.9 60.2 68.9 73.8 76.7<br />

N 2 F 4 13.3<br />

NH 3 (see Ammonium)<br />

N 2 H 4 12.66 41.8 44.7 61.7(g) 77.6 88.2 96.4<br />

NO 2.30 13.83 29.9 31.2 32.8 34.0<br />

NOCl 25.8 47.1 50.7 53.2 54.9<br />

NOF 19.3 44.6 48.9 51.7 53.5<br />

NOF 3 78.7 90.9 97.0 100.5<br />

NO 2 40.5 46.4 50.4 53.0<br />

NO 2 Cl 25.7 59.6 68.1 73.1 76.1<br />

NO 2 F 18.0 57.0 66.4 71.9 75.3<br />

NO 3 55.9 67.4 73.3 76.5<br />

N 2 O 6.54 16.53 42.7 48.4 52.2 54.9<br />

N 2 O 4 14.65 38.12 88.5 104.0 113.4 119.2<br />

N 2 O 5 62.3 110.9 128.4 137.0 141.4<br />

NSF 22.2<br />

Osmium<br />

Os 57.85 738 25.1 25.9 26.7 27.4<br />

OsF 6 28.62<br />

OsO 4 9.8 39.54<br />

Oxygen<br />

O 2 , Ht 0.092 249.49 0.444 6.820 8.204 30.11 32.09 33.74 34.88<br />

Ht 0.745 229.38<br />

O 3 10.84 43.74 49.86 53.15 55.02<br />

OF 2 11.09 64.3 72.4 76.4 78.6<br />

O 2 F 2 19.1<br />

Palladium<br />

Pd 16.74 362 26.5 27.7 28.8 30.0<br />

PdCl 2 40.1<br />

PdO 37.6 49.5 61.3<br />

Phosphorus<br />

P 0.66 12.4 14.2<br />

P 4 , Ht 0.521 77.8 0.659 56.5 58.9 73.3(g) 78.4 80.4 81.4<br />

PBr 3 38.8 78.9 81.2 82.0 82.4<br />

PClF 2 17.6

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