Define mole and find the no of moles present in 12g of oxygen gas
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A mole of a substance is defined as: The mass of substance containing the same number of fundamental units as there are atoms in exactly 12.000 g of 12C. Fundamental units may be atoms, molecules, or formula units, depending on the substance concerned.
Oxygen = O2=32g=6.022*10^23 molecules.
since, 1moleO2=32g
1g=1/32
12g=1/32*12=3/8moles
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