Question

If, from 10 moles NH3 and 5 moles of H2SO4, all the H-atoms are removed in order to form H2 gas, then
find the number of H2 molecules formed.
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Answer 1

1 mole ammonia contains 3 moles of hydrogen atoms.

So 10 moles of ammonia will contain 30 moles of hydrogen atoms .

1 mole of sulphuric acid contains 2 moles of hydrogen atoms .

So 5 moles of sulphuric acid will contain 10 moles atoms.

Total number of moles of hydrogen atoms = 30+10 = 40 moles

2 moles of hydrogen atoms make 1 mole of hydrogen gas

So 40 moles of hydrogen atoms will make 20 moles of hydrogen gas.

1 mole hydrogen gas contains 6.023*10^23 molecules.

20 moles of hydrogen gas will contain 20*6.023*10^23 molecules

=120.46*10^23 molecules.

Answer 2

Explanation:

1 mole ammonia contains 3 moles of hydrogen atoms.

So 10 moles of ammonia will contain 30 moles of hydrogen atoms .

1 mole of sulphuric acid contains 2 moles of hydrogen atoms .

So 5 moles of sulphuric acid will contain 10 moles atoms.

Total number of moles of hydrogen atoms = 30+10 = 40 moles

2 moles of hydrogen atoms make 1 mole of hydrogen gas

So 40 moles of hydrogen atoms will make 20 moles of hydrogen gas.

1 mole hydrogen gas contains 6.023*10^23 molecules.

20 moles of hydrogen gas will contain 20*6.023*10^23 molecules

=120.46*10^23 molecules.