How many moles are present in 11.5 g of sodium ?

Explanation

Gram atomic mass of sodium = 23 g
23 g of sodium represent = 1 mole
`therefore 11*5` g of sodium represent `= ("(1 mol )" xx 11 * 5)/(23*0 g) = 0.5` mol
`6.022` atoms of element will have mass = `2xx 10^(-23) g xx 6*022 xx 10^(23)`
`= 12*044 g = 12 * 0` gram