What is the relative molecular mass (mr) of ammonia, formula NH3?

They are like other investigations? say there was a murder u have to do blood test and finger prints which run through a lab. 

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