Question

Define chemical formula.

Write down the formula of:

Ammonium sulphate, calcium hydroxide ,Iron (II) nitrite & copper bromide​

Answer 1

Answer:

A chemical formula identifies each constituent element by its chemical symbol and indicates the proportionate number of atoms of each element. In empirical formulae, these proportions begin with a key element and then assign numbers of atoms of the other elements in the compound, by ratios to the key element.

Explanation:

Ammonium sulfate is made by treating ammonia, often as a by-product from coke oven, with sulfuric acid: 

2NH3 + H2SO4→   (NH4)2SO4