A) 30.22 g nacl x 1 mol nac l = 58.4430 molar mass (g) nacl=0.5171 mol nacl
b) 0.5171 mol nacl x 1 mol na = 1 mol nacl=0.5171 mol na
0.5171 mol nacl x 1 mol cl = 1 mol nacl= 0.5171 mol cl

a sample of sodium chloride (nacl) has a mass of 30.22g.

a) i have to calculate the number of moles of nacl in the sample. b) calculate number of moles in each element in nacl c) calculate the number of each element in nacl. 

i have a and b done im confused on c.

a. the law of proportion states the combination of 2 atoms in a specific ratio to produce multiple compounds such as the given statement of question ‘1st compound contains 88.8 % cu ’ indicates 88.8 g of cu is present along with 11.2 g oxygen in 100 g of compound whereas the statement ‘2st compound contains 79.9 % cu ’ indicates 79.9 g of cu is present along with 20.1 g oxygen in 100 g of compound

1st compound contains 88.8 g cu

for cu

m = 63 g /mol

atomic % = 88.8 /63 = 1.42

for o

m = 16 g /mol

atomic % = 11.2 /16 = 0.7

b. the emperical formula of 1st compound is

cu1.4o0.7

cu2o