The formula which shows the simplest whole number ratio between the atoms of a molecule is called empirical formula. For example, empirical formula of benzene and glucose is CH and CH₂O respectively.
The formula which shows the actual or total number of atoms in a molecule is called molecular formula. For example, molecular formula of benzene is C₆H₆.
A type of analysis in which a chemist is associated with the quality of a substance is called qualitative analysis. For example, qualitative analysis of glucose means it contains carbon, hydrogen and oxygen.
A type of analysis in which a chemist is associated with the quantity of each element present in a compound is called quantitative analysis. For example, if we say that glucose contains 50% carbon, 30% hydrogen and 20% oxygen, then it is called quantitative analysis.
The number of particles present in one mole of a substance is called Avogadro's number. It is represented by NA and its numerical value is 6.022 × 10²³ particles.
Avogadro's number is equal to the molar mass of the substance.
Ans. Limiting Reactant
Limiting reactant is the reactant which disappears first from the reaction mixture thus stopping the reaction and further product is not formed. So we can say that limiting reactant controls the amount of product formed.
6. How will you identify the limiting reactant?
Ans. Identification of Limiting Reactant
Limiting reactant is determined through the following steps;
(i) Calculate the number of moles of given amount of reactants.
(ii) Calculate the number of moles of given amount of products.
(iii) Identify the limiting reactant which produces less number of moles of products.