How many moles of nitrogen are present in70 g of nitrogen?? explain..
1mole of nitrogen = 14 g (1 mole of an element= gram weight of that element)
Number of moles of nitrogen in 1g = 1/14 = 0.0714 moles.
1 g of nitrogen contains 0.0714 moles, therefore
70 g of nitrogen contains = 70 x 0.0714 = 5 moles