Equal masses of iron and sulphur are heated together to form Fes. What fraction of the original mass of excess reactant is left unreacted? (Fe = 56, S = 32)
0.22
0.43
0.86
0.57

Iron oxide has formula Fe_"0.94"O. What fraction of Fe exists as Fe^(+3) ?

The composition of a sample of Wustite is Fe_(0.93)O_(1.00) . What fraction of the iron is present in the form of Fe (III) ?

1.0 g of magnesium is burnt with 0.56 g O_2 in a closed vessel. Which reactant is left in excess and how much? (At.wt: Mg=24, O = 16)

A mixture of 1.0 mole of Al and 3.0 mole of Cl_(2) are allowed to react as: 2Al(s)+3Cl_(2)(g) to 2AlCl_(3)(g) . Then moles of excess reagent left unreacted is:

The mass of 5.6 dm^3 of a certain gas at S.T.P.is 12.0 g. Calculate the relative molecular mass of the gas.

The composition of a sample of Wustite is Fe_(0.93)O_(1.00) . What fraction of iron is present in the from of Fe^(2+) ion ?

Fe_(0.94) O to Fe^(3+) , the equivalent mass of Fe_(0.94)O will be:

1.00 g of a hydrated salt contains 0.2014 g of iron, 0.1153 g fo sulphur, 0.2301 g of oxygen and 0.4532 g of water of crystallisation. Find its empirical formula. (Fe = 56, S = 32, O = 16)

The composition of a sample of Wustite is Fe_(0.93)O_(1.00) . What percentage of the iron is present in the form of Fe (III) ?

why is Fe0(s) not formed in stoichiometric compostion ?