What is the maximum amount of ethanol (in grams) that can be produced when 0.30 kg of ethylene (C2H4) and 0.029 kg of steam are placed into the reaction vessel?

Answer 1

Do you have an equation? If so then this is a limiting reagent problem. I solve these problems the long way by solving two stoichiometry problems. Here is a worked example of a stoichiometry problem. Just follow the steps AND the directions below the link.
http://www.jiskha.com/science/chemistry/stoichiometry.html

First use the amount of ethylene listed, assume you have all of the steam you need, and calculate, following the example problem, the moles ethanol produced. Then use the grams steam, assume you have all of the ethylene you need, and follow the example to calculate the moles ethanol. You will obtain two answers; both can't be right. The correct answer, in limiting reagent problems, is ALWAYS the smaller value. Using that value, follow the example to find grams ethanol.