Elemental boron can be formed by reaction of boron trichloride with hydrogen.

BCl3 (g) + 1.5H2 (g) - > B (s) + 3HCl (g)

Substance: BCl3 (g) H2 (g) B (s) HCl (g)

S° (J/K•mol) : ? 130.6 5.87 186.8

If? S° = 80.3 J/K, what is S° for BCl3 (g) ?

How many grams of Ca (NO3) 2 are needed to make 25.0 g of a 15.0% Ca (NO3) 2 (aq) ?

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