Question

A compound containing only carbon and hydrogen is found to contain 80.0% carbon. It has a molecular weight of 30.0. What is its molecular formula

Answer 1

(80.0, 20.0) The statement states that 80% of the compound is carbon. To acheive the amount of carbon in a 100 g sample, you need to multiply the weight of the sample by the percentage of carbon in the compound. Recall that 80%=80/100=.8 .8*100g=80g of carbon. The same process goes for the hydrogen. .2*100g=20g hydrogen. Explanation: