Vanillin, the flavoring agent in vanilla, has a mass percent composition of 63.15%C, 5.30%H, and 31.55%O. Determine the empirical formula of vanillin. You may use decimals or whole number in the atomic weights

Choices   : C3H3O , C8H8O3,   C6H6O,   C8H8O

A compound is found to contain 50.05% sulfur and 49.95% oxygen by weight.  The molecular weight for this compound is 64.07. What is its molecular formula? NO SPACES BETWEEN SYMBOLS. You may use decimals or whole number in the atomic weights.

Acetic acid has the formula CH₃COOH. What is the empirical formula?  No spaces between symbols like H2O

For the combustion of sucrose:

C₁₂H₂₂O₁₁ + 12O₂ ---> 12CO₂ + 11H₂O

there are 10.0 g of sucrose and 10.0 g of oxygen reacting. Which is the limiting reagent? You may use decimals or whole number atomic weights.  Your answer must be symbols . No space like H2O

The reaction of 4.25 g of Cl₂ with 2.20 g of P₄ produces 4.28 g of PCl₅. What is the percent yield? your answer should have one decimal place for example 76.9% . Use decimals for atomic weights as you see in the periodic table.