Calculate ΔH in kJ/mol for the reaction N2O5(g) → N2O4(g) + 1/2 O2(g) using these reactions:

2 N2O5(g) → 2 N2(g) + 5 O2(g) ΔH = -38.7 kJ/mol
1/2 N2(g) + O2(g) → NO2(g) ΔH = 32.7 kJ/mol
N2O4(g) → 2 NO2(g) ΔH = 51.8 kJ/mol

Miner's coal distributors does not mine coal itself, nor does it even store or handle the coal. instead, miner's solicits orders for low sulfur coal from other firms, then purchases the required amount from suppliers and directs them to ship the coal to its customers. what is miner's

Astudent completes a titration by adding 12.0 milliliters of naoh(aq) of unknown concentration to 16.0 milliliters of 0.15 m hcl(aq). what is the molar concentration of the naoh(aq)? 1)5.0 m 2)0.20 m 3)0.11 m 4)1.1 m

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