Question

Calculate the number of hydrogen molecules formed when 5.6 mL of ammonia at STP is decomposed by the following reaction:
___NH3 „³ ___ N2 + ___ H2

Answer 1

ammonia gas?

You will have to know the temp,pressure to convert that volume to moles, then to molecules.

Recommend balance the equation first.

Answer 2

You have 5.6 mL of NH3.

There are 22.4 L per mole of gas at STP.

So 5.6e-3 / 22.4 mole of NH3.

Balance the equation to determine the corresponding number of H2.

Answer 3

Correct, Graham, I missed the STP statement.