How many moles of oxygen are present in 24.5g of sulphuric acid?
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OK, so a mole of an element has the same NUMBER as the atomic mass number, but in grams. So if hydrogen is 1.00794 amu, then one mole of H is 1.00794 grams.
So, add up all the masses of H, S and O in the equation: Hx2+S+Ox4 and that is you number in terms of grams per mole.
(24.5g H2SO4) x (1 mol H2SO4) / (your added number up above in g of H2SO4)
The grams cancel and you are left with a quantity of moles of H2SO4. Make sure your answer has only three significant digits, since 24.5 is your most accurate measurement.
Hope this helps.
So, add up all the masses of H, S and O in the equation: Hx2+S+Ox4 and that is you number in terms of grams per mole.
(24.5g H2SO4) x (1 mol H2SO4) / (your added number up above in g of H2SO4)
The grams cancel and you are left with a quantity of moles of H2SO4. Make sure your answer has only three significant digits, since 24.5 is your most accurate measurement.
Hope this helps.
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