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Can anyone answer this please;

Calculate the mass of magnesium needed to make 25g of magnesium oxide

Is enough information given to be able to work out the question?

Thankyou :))

Posted: 15-12-12 16:22 by :) PurpleJaguar (: - Team GR

Mg + O ---> MgO

1: Moles of MgO = Mass/RMM = 25/30 = 0.8333

2: It is a 1:1 ratio so the moles of MgO = the moles of Mg

3: Mass of Mg = moles x RMM = 0.8333 x 24 = 20g

Hope this helps!

Posted: 15-12-12 17:05 by Sophie

Thankyou so much :)

What is RMM is it the same as RFM?

Posted: 15-12-12 18:56 by :) PurpleJaguar (: - Team GR

RMM is the relative molecular mass. not sure what RFM is though.

Posted: 16-12-12 11:10 by Sophie

RFM is relative formula mass :/ I kinda get the method you did ^ 

:S:S:S

Posted: 16-12-12 11:34 by :) PurpleJaguar (: - Team GR

Cool - Im glad I was able to help!!

Posted: 16-12-12 12:06 by Sophie