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First you need to balance any equation given. then you need to figure the mole ratios.say 2 moles of iron (II) sulfide form 1 mole of iron (II) chloride, then it is a 2 to 1 ratio, then you say you have~ 1 mole of iron sulfide X 2 moles of iron chloride/1mole of iron sulfide X of iron sulfide/1 mole of iron sulfide. Just make sure to start with a balanced equation.

there is a formula which is importent : (n) moles = (m) mass / (M)molar mass
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Thanks bro
Avogadros number is the number of molecules in one mole. You would use Avagadros number for calculating a mass if you new you had a mole of something (that means Avagadros number of different particles) and you knew the mass of those particles. The avogrado number is 6.0221415×10^23.
Ok I got it.
Sir the answer given by her is different
Thanx sir
1 4 1
Nothing but I'm smart.
Just kidding.
Just kidding.....
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finally you accepted the truth
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