A 9.78 g sample of ibuprofen, an over-the-counter pain medication, contains 7.40 g carbon and 1.52 g oxygen. Find the mass of hydrogen in a 5.45 g sample of ibuprofen.

An unknown metal forms a compound with bromine and has the formula MBr₅. What is the atomic mass of the metal, if a 6.897-g sample of the MBr₅ contains 0.0541 mol Br?

One sample of H₂SO₄ has 2.77 g H, 43.94 g S and 87.68 g O. Another sample has 8.83 g of H. Calculate the mass of S and O in the second sample.

A sample of NaCl was decomposed into 4.26 g of sodium and 6.57 g of chlorine. 

If another sample was to undergo the same process, which of the following values would be consistent with the law of definite proportions

Identify the number of Al, S, and O atoms in the coagulating agent aluminum sulfate (Al₂(SO₄)₃).