A hydrocarbon was found to contain approximately 75% carbon and 25% hydrogen by mass. Calculate the empirical formula of the hydrocarbon, assuming relative atomic masses of carbon and hydrogen as 12 and 1.

The number of carbon atoms in a hydrocarbon molecule is 2. Write down the name and molecular formula of the hydrocarbon if it is an: i) alkane

The number of carbon atoms in a hydrocarbon molecule is 2. Write down the name and molecular formula of the hydrocarbon if it is an: ii) alkene

The number of carbon atoms in a hydrocarbon molecule is 2. Write down the name and molecular formula of the hydrocarbon if it is an: iii) alkyne

Determine the Empirical formulae of an oxide of iron which has 69.9% iron and 30.1% dioxygen by mass.

A solution is obtained by mixing 300 g of 25% solution and 400 g of 40% solution by mass. Calculate the mass percentage of the resulting solution.

Calculate the mole fraction of benzene in solution containing 30% by mass in carbon tetrachloride.

Calculate the formula unit masses ofZnO, Na_2O, K_2CO_3 , given atomic masses of Zn = 65u, Na = 23u, K = 39u, C =.12u, and O = 16u.

If one mole of carbon atoms weighs 12 grams, what is the mass (in grams) of 1 atom of carbon?

An organic compound contains 69.77% carbon, 11.63% hydrogen and the rest is oxygen. The molecular mass of the compound is 86u. The compound does not reduce Tollens reagent but reacts with Brady's reagent to give yellow precipitate. On vigorous oxidation the molecule produces ethanoic acid and propanoic acid. The compound also shows iodoform test. Identify and name the compound and write the reactions.

The standard enthalpy of combustion of acetic acid, carbon and hydrogen is -867, -393.5 and -285.9 KJ mol^(-1) respectively Calculate the enthalpy of formation of acetic acid.