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+2 Number of hydrogen atoms (H)=2*49+2 Number of hydrogen atoms (H)=98+2 Number of hydrogen atoms (H)=100 So, an alkane with 49 carbon atoms contains 100 hydrogen atoms.