Author Question: Consider the reaction:2ClF3(g) + 2NH3(g) N2(g) + 6HF(g) + Cl2(g)When calculating the Hrxn, why is ... (Read 538 times)

asd123 · **on:** Mar 21, 2021

Question 1

Consider the reaction:

When a 19.2-g sample of ethyl alcohol (molar mass = 46.07 g/mol) is burned, how much energy is released as heat?

◦ 0.417 kJ
◦ 0.571 kJ
◦ 5.71 × 10² kJ
◦ 2.63 × 10⁴ kJ
◦ 2.40 kJ

Question 2

Consider the reaction:

2ClF₃(g) + 2NH₃(g) → N₂(g) + 6HF(g) + Cl₂(g)

When calculating the ΔH°_rxn, why is the ΔH_f° for N₂ not important?

◦ Because nitrogen is in its standard elemental state and no energy is needed for this product to exist.
◦ Because any element or compound in the gaseous state requires a negligible amount of energy to exist.
◦ Because the products are not included when calculating ΔH°_rxn.
◦ Because nitrogen is in its elemental state and does not contribute to the reaction itself.
◦ Two of these statements explain why N₂is not important when calculating ΔH°_rxn.

onowka · **Reply #1 on:** Mar 21, 2021

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