So easy but yet I can't solve it

lundi 27 janvier 2014

Hello.

I am doing a chemistry problem but it is mainly mathematics



Here it is.







A little info that is useful to this problem.



Molar mass is always an average, given by



Molar Mass = (mass of isotope1 * abundance of isotope 1) + (mass of isotope2 + abundance of isotope 2)



Masses of isotopes are always constant, they do not vary from place to place.



So how do I solve this?





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