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  4. 50 gram of calcium carbonate was completely burnt in air. What is the weight (in grams) of the residue?

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Q. $50$ gram of calcium carbonate was completely burnt in air. What is the weight (in grams) of the residue?

Some Basic Concepts of Chemistry

Solution:

$ CaCO _{3} \longrightarrow CaO $ (residue) $+ CO _{2} \uparrow $
$100$ gram $ \longrightarrow 56 $ gram
$50$ gram gives $56 / 2=28$ gram.