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calculate the mass of the following 1.2molhydrogen gas 2.11.2l of ammonia gas at STP 3.6.00
1. mass number of hydrogen = 2.
 The equivalence is 1 mol hydrogen : 2 grams hydrogen 
1.2 mol hydrogen = 2*1.2 grams of hydrogen 
= 2.4 grams.
2. molar mass of ammonia gas (NH3) is 17 grams [14g of nitrogen and 3g of hydrogen].The molar volume is 22.4 litres at STP. 
22.4 l of ammonia gas : 17g
11.2 l of ammonia gas : {17/22.4}* 11.2 grams
: 8.5g


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