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Multiply Mr by percentagehow to find the mass from percentage by number of molecules.....
thank u for the help
for A : (2 x 89.8) + (4 x 10.2) = 220.6
for B: (2 x 80) + (4 x 19) + (16x1) =252
for C: (2x 96.3) + (4 x 3.25) + (16 x 0.45) = 213.4
for D: (2 x 82.5) + (4 x 15.2) + (16 x 2.3) = 263.8
You could have guessed the answer straight away, since CH4 is the heaviest and it's largest percentage exists in D