" 18.How many moles are there in "34.5g" of sodium? (Atomic mass of "Na=23u" ) "

How many moles are there in 34.5 g of sodium ? (Atomic mass of Na = 23 u )

How many moles are present in 11.5 g of sodium?

How many moles are present in 11.5 g of sodium?

How many moles are present in 11.5 g of sodium ?

How many moles are 5 grams of calcium ? (Atomic mass of calcium = 40 u ).

(a)How many moles are present in 11.5g of sodium? (b)The mass of an atom of element (X) is 2.0xx10^(-23)g . Calculate its atomic mass.

Sodium crystallizes in a bcc unit cell. Calcuate the approximate number of unit cells in 9.2 g of sodium (Atomic mass of Na=23)

Sodium crystallizes in a body-centred cubic (bcc) unit cell. Calculate the approximate number of unit cells in 9.2g of sodium. (Atomic mass of Na = 23u).

How many moles and atoms of gold are present in 49-25 g of gold? (Atomic mass of gold=97u)