Question

1. ethane, with the chemical formula $c_2h_6$, is an example of ____.

$circ$ an isotope
$circ$ a hydrocarbon
$circ$ a gasoline
$circ$ a kind of coal

Explanation:

Hydrocarbons are organic compounds composed only of hydrogen and carbon atoms. Ethane has the formula $\text{C}_2\text{H}_6$, containing only these two elements. Isotopes are variants of the same element with different neutron counts, which does not describe ethane. Gasoline is a mixture of hydrocarbons, not a single compound like ethane. Coal is a solid fossil fuel made of complex carbon-based materials, not ethane.

Answer:

a hydrocarbon