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Science Clinic => Chemistry => Topic started by: imanialler on Nov 18, 2019

Title: How much heat is absorbed/released when 40.00 g of NH3(g) reacts in the presence of excess O2(g) to ...
Post by: imanialler on Nov 18, 2019

Question 1

At 1.0133 bar, the heat of sublimation of gallium is 277 kJ mol^-1 and the heat of vaporization is 271 kJ mol^-1. To the correct number of significant figures, how much heat is required to melt 5.50 mol of gallium at 1.0133 bar?
◦ 33 kJ
◦ 6 kJ
◦ 244 kJ
◦ 274 kJ

Question 2

How much heat is absorbed/released when 40.00 g of NH3(g) reacts in the presence of excess O₂(g) to produce NO(g) and H2O(l) according to the following chemical equation?

4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(l)

Δ rH° = 1168 kJ

◦ 685.8 kJ of heat are absorbed.
◦ 2743 kJ of heat are released.
◦ 2743 kJ of heat are absorbed.
◦ 685.8 kJ of heat are released.

Title: How much heat is absorbed/released when 40.00 g of NH3(g) reacts in the presence of excess O2(g) to ...
Post by: nixon_s on Nov 18, 2019

Answer 1

33 kJ

Answer 2

685.8 kJ of heat are absorbed.

Title: Re: How much heat is absorbed/released when 40.00 g of NH3(g) reacts in the presence of excess O2(g)
Post by: Sentha Saravanabavan on Nov 28, 2020

Thank you