Determine the number of moles of oxygen in 7.20mol of H. SO.

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The key about the unit mole is that it does not reference which type of entity is specified. Using the mole only makes sense if you define what you are using the mole for. This could be:

protons

atoms

ions

molecules

formula units of an ionic or metallic solid

aggregates

apples

stars

…

The mole is basically just a large number that you can use instead of e.g. the number 1,000,000 or the number 0.5.

So in your question, 1.3 mol of H2SO4 means that you have 1.3×6.022×1023 molecules of H2SO4, each of which contains one sulphur atom, two hydrogen atoms and four oxygen atoms. Thus, in one mole of H2SO4 you can find:

2 mol of hydrogen atoms

1 mol of sulphur atoms

50 mol of protons

50 mol of electrons

and 4 mol of oxygen atoms.

The correct solution is thus:

n(O)=4×n(H2SO4)=4×1.3×6.022×1023=3.13×1024

Explanation:

The key about the unit mole is that it does not reference which type of entity is specified. Using the mole only makes sense if you define what you are using the mole for. This could be:

protons

atoms

ions

molecules

formula units of an ionic or metallic solid

aggregates

apples

stars

…

The mole is basically just a large number that you can use instead of e.g. the number 1,000,000 or the number 0.5.

So in your question, 1.3 mol of H2SO4 means that you have 1.3×6.022×1023 molecules of H2SO4, each of which contains one sulphur atom, two hydrogen atoms and four oxygen atoms. Thus, in one mole of H2SO4 you can find:

2 mol of hydrogen atoms

1 mol of sulphur atoms

50 mol of protons

50 mol of electrons

and 4 mol of oxygen atoms.

The correct solution is thus:

n(O)=4×n(H2SO4)=4×1.3×6.022×1023=3.13×1024