please explain it as easily as you can. and give some example for each of them.
Asked by BHAVYA PREETI | 19th Aug, 2014, 07:03: PM
Strength: The strength of a solution is defined as the amount of a solute in grams present in one litre of the solution, and hence is expressed in g/litre and is usually written as g L-1.
Strength = Mass of the solute in grams / Volume of the solution in litres
Normality: Normality of a solution is defined as the nuber of gram equivalent of the solute dissolved per litre of given solution. It is expressed by "N".
N = Number of gram equivalent of solute / Volume of the solution in litres.
N = Strength in grams per litre / Eq. mass of solute
Ex. If eq. mass of sulphuric acid is 49 then, a solution of sulphuric acid having 0.49 gram of it dissolved in 350 ml of solution will have its normality as follows:
N = (0.49 g / 49 g eq-1) x ( 1000 cm3L-1/350cm3) = 0.03 g eq L-1
Answered by Prachi Sawant | 20th Aug, 2014, 11:41: AM
- When lead sulphide, PbS and lead oxide, PbO, are heated together the products are lead metal and sulphur dioxide, SO2. PbS(s) + 2PbO(s) 3Pb (l) + SO2 (g). If 14.0 g of lead oxide reacts according to the above equation, how many (a) moles of lead (b) grams of lead, (c) atoms of lead and (d) grams of sulphur dioxide are formed? (Atomic mass : Pb = 207.0, S = 32.1 ; O =16.0)
- 1) Calculate the number of Cl2 molecules and Cl atoms in 0.25 mol of Cl2 gas. 2) Molar mass of O is 16 g mol-1. What is the mass of one atom and one molecule of Oxygen?
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