If $100$ grams of calcium carbonate (whether in the form of marble or chalk ) are decomposed completely, then $56$ grams of calcium oxide and $44$ grams of carbon dioxide are obtained. Which law of chemical combination is illustrated by this statement?

Q. 2 kg of calcium carbonate (lime stone) decomposes completely on heating, forming calcium oxide (lime) and carbon dioxide. If 880 grams of carbon dioxide is formed, what is the mass of calcium oxide formed?

Q. If $100$ grams of pure water taken from different sources is decomposed by passing electricity. $11$ grams of hydrogen and $89$ grams of oxygen are obtained. Which chemical law is illustrated by this statement?

Q. Calcium carbonate decomposes completely, on heating, into lime $\left(CaO\right)$ and carbon dioxide $\left(C{O}_2\right)$. 1 kg of calcium carbonate is completely decomposed by heat, when 560 g of lime are obtained. How much quantity of carbon dioxide in grams, moles and litres at NTP is produced in the process ?

Q. 'If 100 grams of pure water taken from different sources is decomposed by passing electricity, 11 grams of hydrogen and 89 grams of oxygen are always obtained'. Which chemical law is illustrated by this statement ?

Q. When 5 gram of calcium is burnt in 2 gram of oxygen then 7 gram of calcium oxide is produced. What mass of calcium oxide will be produced when 5 gram of calcium is burnt in 20 gram of oxygen? Which law of chemical combination will govern your answer?