Question

how many moles are there in 2 g hydrogen

Answer 1

no of moles = given mass/ atomic
therefore 2/1 = 2 moles

Answer 2

Hi.............................
the answer for your question is answered below:
so, first we should write the formula which is 
                   no.of moles = given mass/atomic number
so,second we should give them the certain numerical value
                   therefore, no.of moles = 2 / 1 = 2 
the answer for your question is 2 moles
Thank you...........................