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# Iron and manganate question watch

But I do not understand how the mark scheme got to it :/ ?
I know the ratio is 1:5
2. 1) Unit conversion
2) Mole equation

3. (Original post by AlphaArgonian)
1) Unit conversion
2) Mole equation

4. (Original post by Hazel99)
Convert mg to grams. So 10mg to grams is 10/1000 = 0.01 grams of Fe2+

Then, to find moles, do mass/molecular mass which is 0.01/55.8 = your answer.
5. moles = mass/mr

10mg = 0.01g (mass)
Fe (Iron) Mr = 55.8

moles = 0.01/55.8

Just remember the equation moles = mass/Mr.

6. (Original post by Hazel99)
So yeah convert mg to g (10mg = 0.01g) then use the n=M/Mr equation

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Updated: January 15, 2017
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