Answers

2016-03-08T09:05:16+05:30
Atomic mass of Fe_2O_3 is 159.7 u

320 kg = 320000 gm

159.7 gm = 6.022*10^{23} atoms
1 gm =  \frac{6.022*10^{23}}{159.7} 

320000 gm =  \frac{6.022*10^{23}}{159.7}*320000 = 120.66 * 10^{25} atoms
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