If a normal alkane contains 15 carbon atoms, how many hydrogen atoms does it contain?

General molecular formula CnH2n+2
 2n+2= 15
 2n=13
n = 13/2= 6.5 
 rounding off we get 7 hydrogen atoms.

Firstly, the water in the dams hold gravitational potential energy as they are above ground level. the gravitational potential energy is then transferred to kinetic energy as it falls, spinning the turbinethe turbine then spins the generator, which is a large magnet surrounded by metal coils. by doing this, the generator generates electricity. in this action, the energy transfer taken place is kinetic to electric energy