Two elements X and Y combine to form two compounds $XY_2$ and $X_2Y_3$. If 0.05 moles of $XY_2$ weighs 5 g and 0.10 moles of $X_2Y_3$ weighs 20 g, find the atomic masses of X and Y.

Which law explains the observation that 1g of hydrogen always combines with 8g of oxygen to form 9g of water?

Iron filings are added to a solution of copper sulfate. Which observation indicates a metal displacement reaction has occurred?

10 g of a metal oxide on strong heating gave 6.4 g of metal. If the formula of the metal oxide is $M_2O_3$, what is the atomic mass of the metal M?

A sample of hydrated copper sulfate ($CuSO_4 \cdot xH_2O$) weighs 25 g. Upon heating to drive off all the water, the anhydrous copper sulfate ($CuSO_4$) remaining weighs 16 g. What is the value of 'x' (the number of water molecules of crystallization)?

If two elements A and B combine in different ratios to form two compounds, the masses of B that combine with a fixed mass of A are in a small whole number ratio. This is a statement of:

Which of the following experiments definitively proved the Law of Conservation of Mass?

A mixture of $CO$ and $CO_2$ weighing 1.12 g is treated with an excess of red hot $CuO$. The $CO$ is converted to $CO_2$. The total weight of $CO_2$ produced is 1.6 g. What was the weight percentage of $CO$ in the original mixture?

Which of the following postulates of Dalton's atomic theory explains the Law of Conservation of Mass?

Which of the following reactions is the metal displacement reaction? Choose the right option.

Which law explains why 18g of water always decomposes into 2g of hydrogen and 16g of oxygen?