) When coal is burned completely into carbon dioxide and other gases, the total amount of matter of the gases .

This question is incomplete

Explanation:

This question is incomplete. The process described in the question is combustion; where a substance burns completely in excess oxygen to produce mainly carbon dioxide and then other gases. There is no chemical equation for this particular combustion reaction because coal is a mixture.

However, the amount of the matter of the gases produced from this combustion must be equal to the total number/amount of matter that constitutes the coal because of the law of conservation of matter that states matter can neither be created nor destroyed.

6 cos 34, 6 sin 34 trig