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# 3g of hydrocarbon on combustion with 11.2g of oxygen produce 8.8g of $CO_2$ and 5.4g of $H_2O$.The data illustrates the law of

$\begin{array}{1 1}Conservation \;of\;mass \\ Multiple\;proportions \\ Constant \;proportions \\ Reciprocal \;proportion \end{array}$

$\sum$ Masses of reactant=$\sum$ Masses of products
$\;\;\;\;(3+11.2)g\;\;\;\;\;\;=\;\;\;(8.8+5.4)g$
$\therefore$Law of conservation of mass is verified.
Hence (a) is the correct option.