Ammonia reacts with oxygen according to the equation 4NH3(g)+5O2(g)→4NO(g)+6H2O(g),ΔHrxn =−906 kJ

Calculate the heat (in kJ) associated with the complete reaction of 155 g of NH3. For this problem, be sure to include the correct sign for q to indicate the direction of heat flow.

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

Consider the reduction reactions and their equilibrium constants. cu+(aq)+e−↽−−⇀cu(s)pb2+(aq)+2e−↽−−⇀pb(s)fe3+(aq)+3e−↽−−⇀fe(=6.2×108=4.0×10−5=9.3×10−3 cu + ( aq ) + e − ↽ − − ⇀ cu ( s ) k =6.2× 10 8 pb 2 + ( aq ) +2 e − ↽ − − ⇀ pb ( s ) k =4.0× 10 − 5 fe 3 + ( aq ) +3 e − ↽ − − ⇀ fe ( s ) k =9.3× 10 − 3 arrange these ions from strongest to weakest oxidizing agent.

Measurements that have similar values are: a. usually accurate b. sometimes accurate c. always accurate d. never accurate