Ammonia is made from the reaction of hydrogen gas and nitrogen gas. If 1.2 X I0J

Question

Ammonia is made from the reaction of hydrogen gas and nitrogen gas. If 1.2 X I0J grams of nitrogen gas are used, how much hydrogen gas is needed for a complete reaction? Consider the reaction of phosphorus with chlorine to form phosphorus trichloride. If 37.2 grams of phosphorus and 170.4 grams of chlorine are used, what is the yield of phosphorus trichloride? When potassium chlorate is heated, potassium chloride and oxygen gas are formed. The percent yield of the reaction is 83.2%. How much potassium chlorate must be decomposed to produce 198.5 grams of oxygen?

Explanation / Answer

N2 + 3H2 ==> 2NH3

1 mole of n2 reacts with 3moles of H2.

moles of N2 used = 1.2*10^3gm/28gmmol^-1 = 0.043 *10^3 moles

moles of H2 required = 3*0.043 *10^3 moles =0.129*10^3 moles

mass of H2 = 0.129*10^3 moles*2gmmol^-1 =0.257*10^3 gm

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