Aparticular coal contains 2.5% sulfur by mass. when this coal is burned, the sulfur is converted into sulfur dioxide gas. the sulfur dioxide reacts with solid calcium oxide to form solid calcium sulfite.

Although your question is incomplete I have provide more general answer is provided

The  Reaction equation between sulfur dioxide and solid calcium oxide :

Given that your question is vague I have provided the reaction equation between the Sulphur dioxide and calcium oxide, and the chemical conversion equation of Sulphur to Sulphur dioxide ( gas )

conversion of Sulphur to Sulphur dioxide

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zfoods? ok, pressure is used to keep the heat inside and to keep the food perfect.

the formula mass of a molecule or a compound is the sum of the atomic weights of the atoms in its empirical formula

(that's what i know about formula mass)