Nitrogen gas can be prepared in the laboratory by the reaction of ammonia with c

Question

Nitrogen gas can be prepared in the laboratory by the reaction of ammonia with copper (II) oxide according to the following unbalanced equation. (balanced the equation first) NH3 (g) + CuO (s) rightarrow N2 (g) + Cu (s) + H2O (1) How many grams of copper (II) oxide is required to produced 2.74 liters of nitrogen gas collected at 35 degree C and 578 mmHg? Sodium thiosulfate, Na2S2O3, is used as a fixer in black and white photography. Assume you have a bottle of sodium thiosulfate and want to determine its purity. The thiosulfate ion can be oxidized with iodine (I2) according to the equation: I2 (aq) + 2 S2O23 2- (aq) rigtharrow 21 (aq) + S4O6 2- (aq) If it takes 40.21 ml of a 0.246 M solution of I2 to neutralize an impure 3.232 gram sample of sodium thisulfatem what is the weight percentage of Na2S2O3 in the impure sample? (Hint: find the mass of sodium thiosulfate in the original sample).

Explanation / Answer

1) 2NH3+ 3CuO ---> N2 + 3Cu + 3H2O

determine the moles of N2:

T= 35

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