How many number of hydrogen atoms are present in 6.8 gram of ammonia
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Gram atoms means gram atomic weight. This is the mass of 1 mol of that substance.
mass of 1 mol of ammonia=17
mass of H atom per mol of NH3 =3
thus 8.5 g NH3 will have 8.5*3/17 g of H/mol of NH3 =1.5 g of H/mol.
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