Q.2 which of the following has a larger number of molecules and how? 7g of nitrogen or 1 g of hydrogen.
Wt of nitrogen = 7g
Mol .wt of nitrogen = 28g
No of moles of nitrogen = wt. in gm/mol.wt
= 7/28 = 0.25 mol.
Similarly,
Wt of hydrogen = 1g
Mol .wt of hydrogen = 2g
No. of moles of hydrogen = wt. in gm/mol. Wt
= 1/2 = 0.5 mol
Since the number of moles of hydrogen is greater, there is a larger number of molecules in 1 g of hydrogen.