1. There are five atoms in the methane molecule, . One of these five is a carbon atom, which is  carbon. What is the percent carbon in ethane, ? Propane, ? Butane, ? 2. Do heavier hydrocarbons tend to...

1. There are five atoms in the methane molecule,
. One of these five is a carbon atom, which is
 carbon. What is the percent carbon in ethane,
? Propane,
? Butane,
?

2. Do heavier hydrocarbons tend to produce more or less carbon dioxide upon combustion compared with lighter hydrocarbons? Why?