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[andrewloppol]

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[kamil9876]

Moles are all about ratios:

e.g: if 3 molecules have a mass of 2grams. 12 molecules has how many grams? Because there are 4 times as many molecules, the mass if 4 times as much. Formally we can describe this as the mass to molecules ratio is preserved i.e: 2:3=8:12
Mr of TNT is 227 means that 6.02*10^26 particles has a mass of 227grams.



Which you may recognise as that dogmatic mole formula you guys are supposed to learn. Notice that this is the exact same to the small example I provided above, just with nastier numbers. (if you relate it to that math-friendly example you will understand)

Your third question uses the same strategy.

Now as to you're second question:

You recognised that moles are just a count of particles (just like dozen counts things too, it's just a mere 12 rather than 6.02*10^26)

For every three we have an . Hence for every TNT molecule there are three molecules. THat means that if we have TNT molecules then we have three times as much () So you see, no matter what our number is we always have three times as much . Hence if we have 0.2mol of TNT we have 0.6mol in those TNT's.

[ilovevce]

What kamil says is true, except 1 mole = not .

You have been given the number of molecules of TNT. You can work out how many moles this is equal to.



If you know that onle mole of TNT weighs 227 grams, then 1000 moles of TNT must weigh 1000 times as much. That would be 227 kilograms.

The second question is worded a bit dodgy. There are no molecules in the TNT. You can't actually separate them from the molecule. So it's just a theoretical idea.

Each TNT molecule contains 6 atoms and each molecule contains 2. So from one TNT molecule you would get 3 molecules.

This means that the number of moles of is 3 times as much as the number of moles of TNT you have.
Therefore  

For the last part, you need to work out how many moles of TNT you have. Since you know the mass of 1 mole, you can simply multiply this by the number of moles of TNT you work out.

[kamil9876]

What kamil says is true, except 1 mole = not .

Lol sorry for that, it's been a long time. Knew something bad would go wrong with my first chem post