## General Chemistry

### Matter

Question
12 out of 14

The following reactions were conducted in a lab for studies related to reaction kinetics. Consider the reactions shown below:

In Reaction 2, if 54 g of water was formed, how much ethane and oxygen must have reacted?

 A 30 g of ethane and 224 g of oxygen B 60 g of ethane and 224 g of oxygen C 30 g of ethane and 112 g of oxygen D 60 g of ethane and 112 g of oxygen
Ans. C

According to Reaction 2, two moles of ethane will react with 7 moles of oxygen to form 4 moles of carbon dioxide and 6 moles of water. In the question, it is given that 54 g of water was formed. This corresponds to 3 moles of water. From the equation, we can say that 1 mol of ethane must have reacted to form 3 moles of water. We can also say that 3.5 moles of oxygen must have reacted in the formation of 3 moles of water. The last step is the conversion of moles to grams. The corresponding quantities in grams are 30 g of ethane and 112 g of oxygen.