Short Questions on Stoichiometry
This page consists of solutions of short questions included in the Stoichiometry course of First Year.
Statement of the question
(a) What do you mean by percentage composition of a compound? How the percentage of an element is calculated in a compound?
(b) Calculate the percentage composition of each of the following compounds. (Given atomic weights of the elements).
(i) MgSO4 (ii) C3H6O (iii) KMnO4 (iv) C6H6 (v) NaAl(SO4)2 (vi) CaCO3 (vii) CH4
[Mg = 24, S = 32, O = 16, C = 12, K = 39, Na = 23, Mn = 55, Ca = 40, Al = 27, H = 1]
(a) Differentiate between a “limiting reagent” and a “reagent in excess”. How will you identify the limiting reagent in a chemical reaction?
(b) How does a limiting reagent control the amount of the product formed? Give an example.