How much sulphur dioxide is produced on complete combustion of 1 kg of coal containing 6.23percent sulphur?

Approximately , assuming that all sulfur in that coal was converted to .

Explanation:

Look up the relative atomic mass of and on a modern periodic table:

Convert the unit of the mass of coal to grams:

.

Mass of sulfur in that much coal:

.

The relative atomic mass of sulfur is . Therefore, the mass of each mole of sulfur atoms would be . Calculate the number of moles of atoms in that of sulfur:

.

Each molecule contains one sulfur atom. Therefore, assuming that all those (approximately) of sulfur atoms were converted to molecules through the reaction with , (approximately) of molecules would be produced.

Calculate the mass of one mole of molecules:

.

The mass of that of molecules would be:

.

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