What is % of phosphorus in calcium phosphate?
`(Ca=40,P = 31,O= 16)

What is the percentage of P_(2)O_(5) in calcium phosphate [Ca_(3)(PO_(4))_(2)] ?

Calculate the amount of sulphuric acid (75% by weight) which is needed to decompose 0.5 mole of calcium carbonate (Ca=40, C=12, S=32).

What is the mass in grams of a calcium atom, Ca?

What is the number of H_2 atom in 0.9 gm of water? (H = 1, O = 16)

Howmany gram of CO_2 would be required to be passed through a tank of lime water to proudce 100 grams of CaCO_3 ? (Ca= 40,C = 12,0= 16).

How many gram of CaCO_3 will react with exces of dilute HCl to produce 66 gm of CO_2 ? (Ca = 40, C = 12, O = 16)

A compound has the following composition Mg = 9.76%,S = 13.01%, 0 = 26.01, H_2O = 51.22, what is its empirical formula? [Mg = 24, S = 32, O = 16, H = 1]

To prepare 66 gm CO_2 how much quantity of CaCO_3 will be required? [Ca = 40, C = 12, O = 16]

6g of an impure sample of potassium chlorate gives 1.9g of oxygen on heating in presence of a catalyst. What is the percentage of purity of the sample. [K = 39,Cl = 35.5, O = 16]