i want to know about mole concept
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MOLE CONCEPT
1mole is the amount of the substance that contain as many particles as there are atoms in exactly 12g of the 2^C isotope .
Always put 1 mole = 6.022* 10^23. 1 mole of oxygen atom contains 6.022*10^23 atom wch weighs 16 g .
1 molecule of O2 contains 6.022*10^23 molecules wch weighs 32 g.
U may understand it further by an example ..see ..suppose the question is to calculate the mass of an atom of silver,
Ans . 1 mole =6.022*10^23 =108g . Mass of 1 atom = 108/6.022*10^23 =108*10^-23/6.022
Now after solving this ..we will get 17.93 * 10^-23.
if the question is to calculate the mass of a molecule of CO2 , in this also u may follow the same steps as given above.
Now , if the question is to calculate the number of molecules in 34.2g of cane sugar (C12H22O11)..
Ans. 6.022 * 10^23 = it's molar mass. =12(12)+22(1)+11(16)=342g.
So , 342g = 6.022*10^23 molecules. 1g = 6.022*10^23/342
therefore , 34.2g = 6.022*10^23 /342 *34.2
= 6.022*10^23 .
HOPE IT HELPED :)
Regards ilml
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