Apoint mutation that does not result in a change to the amino acid coded for is said to be a mutation.

The appropriate response is Silent mutation, a mutation in DNA that doesn't fundamentally modify the phenotype of the  organism in which they happen. Quiet changes can happen in non-coding districts, or they may happen inside exons.Hope this will help 

30litre of li2o is 1.0002mole approximately 1 mole