Calculate ΔH for the following reaction: PCl3 (l) + Cl2 (g) → PCl5 (s)

given the following:

1) 2 P (s) + 3 Cl2 (g) → 2 PCl3 (l) ΔH = -639.4 kJ

2) 2 P (s) + 5 Cl2 (g) → 2 PCl5 (s) ΔH = -887.0 kJ

the answer is 303.15 or 303

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the atomic number of carbon is six, which means that a carbon atom has six protons. carbon has three naturally occurring isotopes: carbon-12, carbon-13, and carbon-14. which of these statements are true about carbon and its isotopes? select all that appl