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A sample of ammonia gas is completely decomposed to nitrogen andhydrogen gases over heated iron wool....

A sample of ammonia gas is completely decomposed to nitrogen andhydrogen gases over heated iron wool. If the total pressure is 639mmHg, calculate the partial pressure of N2 and H2. Enter your answers in scientific notations

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Expert Solution

The reaction takes place is   NH3 (g) (1/2) N2 (g) + (3/2)H2 (g)

Given that ammonia gas is completely decomposed to nitrogen and hydrogen gases , so there is no ammonia left in the mixture.There is only N2 & H2 in the mixture.

According to Dalton's law of partial pressures ,

partial pressure of N2 + partial pressure of H2 = toatl pressure = 639 mm Hg

Since there is 1/2 mole N2 & 3/2 moles H2 in the mixture.

Let a be the partial pressure of N2, the partial pressure of H2 is therefore 3a.

So total pressure = a + 3a = 639 mm Hg

                                     4a = 639

                                       a = 159.75 mm Hg

The partial pressure of N2 is , pN2 is a = 159.75 mm Hg

      partial pressure of H2 is , pH2 is 3a = 3x159.75 mm Hg

                                                            = 479.25 mm Hg

queen_honey_blossom answered 5 months ago
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