Question

The percent composition of a compound was found to be 63.5 % silver, 8.2 % nitrogen, and 28.3 % oxygen. Determine the compound's empirical formula. A 170.00 g sample of an unidentified compound contains 29.84 g sodium, 67.49 chromium, and 12.61 g oxygen. What is the compound's empirical formula? A 60.00 g sample of tetraethyl lead, a gasoline additive, is found to contain ' g lead, 17.83 g carbon, and 3 74 g hydrogen. Find its empirical formula.

Answer 1

Q2.

MW of Silver = 107.8682 g/mol

MW of Nitrogen = 14 g/mol

MW of Oxygen = 16 g/mol

so..

assume a basis of 100 g

so

63.5 g of Silver, 8.2 g of N, 28.3 g of O

mol of Ag = mass/MW = 63.5/107.8682 =0.588681 mol

mol of N= mass/MW = 8.2/14= 0.5857 mol

mol of O= mass/MW = 28.3/16=1.76875 mol

ratio is:

1.76875/0.588681 = 3

Ag:N:3O

Empiricla formula:

AgNO3

i.e.

Silver Nitrate