رد: Chemistry Study Group تجمع الطـالبات ~
3. Which of the following samples contains the greatest number of atoms?
A. 100 g of Pb
B. 2.0 mole of Ar
C. 0.1 mole of Fe
D. 5 g of He
E. 20 million O2 molecules
بنااااااات بلييييييييز مو فاهمه ايش يبغى هدا السؤال ؟؟؟؟
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