Answer please ....... Thank you

Question

When Samantha analyzed a compound to find that it contains the following percentages of the elements by mass: barium, 89.56%; oxygen, 10.44 %. 

a) Assuming 100.0 g of this compound, how many grams of Ba and O are there?

b) How many moles of  Ba and O are there?

c) Determine the empirical formula of the compound. Show your calculations.

Answer 1

a) 100.0 g x 89.56% Ba = 89.56 g Ba

100.0 g x 10.44% O = 10.44 g O

b) moles Ba = 89.56 g Ba x 1 mol Ba / 137.3 g = 0.6523 moles Ba

moles O = 10.44 g O x 1 mol O / 16.00 g = 0.6525 moles O

c) mole ratio of Ba : O = 0.6523 / 0.6525 = 1 indicating 1 mole of each element.

Empirical formula = BaO