Posted by Lisa on Thursday, December 6, 2012 at 7:01pm.
Si + O2 ==> SiO2
28.1 x (1 mol SiO2/1 mol Si) = 28.1 x (60.1/28.1) = 60.1
I suppose that's what is wanted for dimensional analysis; however, there is a quicker way to get it.
Simply add the atomic masses to obtain 28.1 + 2*16 = 60.1
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