Which of the following has maximum number of atoms


Asked by admin @ in Chemistry viewed by 309 People


Which of the following has the maximum number of atoms and how?

a) 18g of O2 b)18g of H2Oc) 18g of CO2d) 18g of CH4

Answered by admin @



The greater the no.of moles of the substance , the higher the number of molecules or atoms of that substance.

So, we'll check which substance is having the most number of moles.

a) 18 g of O2
no of moles = 18/2*16 = 18/32 = 9/16

b) 18 g of H2O
no of moles = 18/18 = 1 mole

c) 18 g of CO2
no. of mole = 18/44 = 9/22

d) 18 g of CH4
no. of mole = 18/16 = 9/8 = 1.125

So, CH4 has the most number of moles and thus most number of molecules.



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