We have to determine whether the substance B formed by decomposition of substance A is an element or a compound.
The solid substance A decomposes to produce B and a gas C, which has the same composition as the gas which is produced by combustion of carbon.
When carbon is burned in excess oxygen, it is converted to carbon dioxide gas (CO2).
A solid white substance A is heated strongly in the absence of air. It decomposes to form a new white substance B and a gas C. The gas has exactly the same properties as the product obtained when carbon is burned in an excess of oxygen.
Based on these observations, can we determine whether solid B is an element or a compound?
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