The general formula for alkanes is CnH2n+2. For an alkane with 49 carbon atoms (n=49), the number of hydrogen atoms can be calculated as follows:Number of hydrogen atoms (H)=2n+2Number of hydrogen atoms (H)=2⋅49+2Number of hydrogen atoms (H)=98+2Number of hydrogen atoms (H)=100So, an alkane with 49 carbon atoms contains 100 hydrogen atoms.