Question

What is the molecular mass of substance each molecule of which conatins 4 atmos of carbon?

Answer 1

Well, you got butane, i.e. C4H10…

And so we take the SUM (with reference to the Periodic Table for the atomic masses of carbon and hydrogen)…

[4×12.011+10×1.00794]∙g∙mol−1=??∙g∙mol−1