A sample of hydrated copper sulfate weighs 25g. After heating to remove the water of crystallization, the anhydrous copper sulfate weighs 16g. What is the percentage of water of crystallization in the original sample?

Which law implies that the mass ratio of elements in a compound is always a whole number ratio?

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

Hydrogen and oxygen combine to form water (H2O). If 4g of hydrogen reacts completely with oxygen to form water, what mass of oxygen is required?

Two different samples of copper(II) oxide were analyzed and found to contain the same percentage of copper by mass. Which law does this illustrate?

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)?

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?

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

Which law states that a chemical compound always contains the same elements combined together in the same fixed proportion by mass?

If two elements A and B combine to form two compounds AB and AB2, and 1g of A combines with 0.5g of B in AB, how much of B will combine with 1g of A in AB2 according to the Law of Multiple Proportions?