Chemistry Mole,Gram molar volume, Chemical equation
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Mole

A mole is the amount of substance that contains as many as particles that are present in `12 g` of carbon-12 isotope. There are `6.023xx 10^(23)` atoms in `12 g` carbon-12.

Number of mole ` = text(Weight of substance in grams)/text(Gram molecular weight)`

`= text(Number of particles/atoms)/text(Avogadro's number)`

`= text(Volume of gas in litres at STP)/(22.4 L)`

Gram Molar Volume

The volume occupied by 1 mole of a substance is called the gram molar volume of the substance. For perfect gas, gram molar volume is 22.4 L at STP or NTP . STP or NTP means 273.15 K (`0^0`C) temperature and 1 bar (`10^5` pascal) pressure.

e.g. volume of 1 mole of `H_2` at STP `22.4 L` voIume of `1/4` mole of `H_2 = (22.4)/4 = 5.6L`

Chemical Equation

A chemical equation uses chemical symbols to show what happens during a chemical reaction. In a chemical reaction, the substance which undergoes a chemical change is called the reactant and the substance which is formed as a result of a chemical change is called the product.

e.g. `Zn+H_2SO_4 → ZnSO_4 + H_2↑`

A chemical equation represents :

• Compounds taking part in the reaction.
• Products or compounds formed during the reaction.
• Catalysts used for the reaction (if any).

 
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