The study of relationship between the amounts of reactants and products as indicated by the balanced chemical equation is called stoichiometry. Explanation: Stoichiometry is used to calculate the amount of the product formed or that of the reactant required in a reaction. Stoichiometric calculations are performed by the following assumptions in hand: Reactants are completely…
The volume of one mole of an ideal gas at standard temperature and pressure is called molar volume of a gas and is equal to 22.414 dm3 at STP (Standard temperature & pressure) & 24 dm3 at RTP (Room temperature & pressure). Explanation: At standard temperature and pressure: 2 g of hydrogen (H2) = 1…
An analytical procedure in which an organic compound is burnt to determine the percentage of each element present in the compound is called combustion analysis. In combustion analysis, weighed amount of an organic compound is burnt in the stream of oxygen in a closed tube known as combustion tube. At the end of this tube…
A formula which tells the relative number of atoms present in a compound is known as empirical formula. Examples: NaCl, HO and CH2O are the empirical formulas of sodium chloride, hydrogen peroxide and glucose respectively. Determination of Empirical Formula for Organic Compounds: To determine empirical formula percentage of each element present in a compound is…
A formula which tells the actual number of atoms present in a molecule of a substance is known as molecular formula. Examples: H2O2 and C6H12O6 are the molecular formulas of hydrogen peroxide and glucose respectively.
Many elements exist as a mixture of their isotopes. The atomic masses of such elements depend upon the number of their isotopes and their natural abundances. This is why their atomic masses are in fraction. This can be explained through following example, EXAMPLE: A sample of neon is found to consist of 20Ne, 21Ne and…