How many hydrogen atoms are in an unbranched alkene with one double bond and 3 carbon atoms?

An unbranched alkene with 3 carbon atoms and one double bond will have a chemical formula of C₃H₆. Since each carbon atom forms 4 bonds (including the double bond), we can calculate the number of hydrogen atoms by subtracting the number of carbon atoms (3) from the total number of atoms (6), which gives us 3 hydrogen atoms.