How does the mass of 1 mole of carbon compare to the mass of 1 mole of magnesium?

a. 1 mole of carbon is heavier than of 1 mole of magnesium.
b. 1 mole of carbon lighter than of 1 mole of magnesium.
c. they have equal masses
d. it is impossible to compare the mass of different elements
e. none of the above

B one mole of carbon is lighter than one mole of magnesium

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