There are b) 3.010 * 10 ^ 24 molecules in 5 moles of O2
The mole is the amount of substance of a system which contains as many elementary entities as there are atoms in 0.012 kilograms of carbon 12 .
Number of moles = 5 moles
Number of molecules = ?
Avogadro's number = 6.022 * 10^23
Number of molecules in 5 moles of O2= number of moles * Avogadro's number
= 5 * 6.022 * 10^23
= 30. 10* 10 ^23 = 3.011 * 10 ^ 24 molecules
There are b) 3.010 * 10 ^ 24 molecules in 5 moles of O2
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