Mass – Volume Relationship (Stoichiometry)

S.I. UNIT OF QUANTITIES: LENGTH, MASS VOLUME ETC

S.I. UNITS OF QUANTITIES

S.I.  unit means international system [used to describe units of measurements from French ‘system international’] S.I. units

For example,

Relationship between quantities

(a) M \(= \frac{m}{n}\) i.e molar mass \(= \frac{mass}{amount}\)

Molar volume  \(= \frac{mass}{amount}\)

(b) Molar volume \(= \frac{Numbers}{amount} = \frac{N}{A}\)

(c) Avogadro’s constant \(= L = \frac{N}{A} = \frac{Numbers}{amount}\)

TYPES OF MASS AND VOLUME PROBLEMS

There are two types of mass and volume relationship problems namely:

1. Mass- mass problem:

In this type of problem, the reacting mass of substance and its molar mass is usually given and we may be required to determine the mass of another substance produced and its molar mass also given. The reversed form of this is when the mass of another substance product produced is given and one is asked to find the mass of the substance which produced it.

2. Mass- gas volume problem:

In this case, you may be given a certain reacting mass of a reactant and required to find the volume of another substance produced at S.T.P.