calculate the number of molecules present in 22g of carbon dioxide

no. of molecules = moles * avagadro no. 

moles = given weight / molecular wt 

             = 22 / 44 

             = 1/2

             = .5

no. of molecules = 0.5 * 6.022 * 10 23

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 no of molecules = mass /molar mass *6.02*1023

  = 22/44*100 =0.5*6.02*1023

 = 3.01*1023 molecules

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