The atomic number of an element tells you the number of protons that an atom of the given element has.
Y2O3 is the molecular formula. Yttrium (III) oxide is also called yttria. It is a white substance and is air-stable. The usual application for this compound is a starting material for inorganic compounds and in material science. IT is insoluble in water and has a high melting point.
We can use evaporation and as well filtration to separate solid to liquid.
To balance the reaction, we look at the number of atoms of each element we have. It should be equal for both sides. The balanced reaction is:
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Al2(SO4)3 + 3Ca(OH)2 = 2Al(OH)3 + 3CaSO4
The ratio of calcium hydroxide and aluminum hydroxide is 3:2.</span>
