Identify the reactant compound in each of the following cases : • CO2 gas is evolved.
• Water vapour is the only gas evolved.
•Two different gases are evolved and the oxide residue remains.

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well, they made a movie about how animals lived there.

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beta decay is the answer

in 1783 cavendish was working with his hydrogen gas and found that when he burned it and condensed the vapor it was water. this was very significant since it disproved the greek theory of elements completely since water was not a simple substance but the product of two gases. it was lavoisier who hearing of the experiment gave cavendish's gas the name hydrogen ("water-producer") and added that hydrogen burned by combining with oxygen and that water was a hydrogen-oxygen combination.

explanation:

the answer is 0.42 is that is an option. this question provides no info