$A$ sample of pure carbon dioxide,irrespective of its source,contains $27.27\%$ carbon and $72.73\%$ oxygen. This data supports:

Which of the following pairs of compounds demonstrates the law of multiple proportions?

After a chemical reaction,the total mass of reactants and products

Write about Dalton's Atomic Theory.

The law of definite proportions is not applicable to nitrogen oxides because

$5.06 \ g$ of pure cupric oxide $(CuO)$ on complete reduction gives $4.04 \ g$ of metallic copper. In another experiment,$1.3 \ g$ of metallic copper is dissolved in nitric acid and the resulting solution is carefully dried to yield $1.63 \ g$ of $CuO$. Which law of chemical combination is illustrated by these results?