which has more number of atom, 100 grams of sodiumor 100 grams of iron (given atomic mass of na = 23 u , Fe = 56 u )?
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>> In order to solve this problem, we should convert 100 grams of sodium into moles of sodium, and also 100 grams of iron into moles of iron. The element having more moles will have more atoms. Please note that since the atomic mass of sodium is 23 u , the molar mass of sodium will be 23 g / mol. Similarly, since the atomic mass of iron is 56 u , the molar mass of iron will be 56 g / mol. We will now calculate the moles of sodium atoms (Na) and iron atoms (Fe), one by one.
(i) Mass of sodium = Mass of sodium / Molar mass of sodium
= 100/23
= 4.34
(ii) Moles of iron = Mass of iron / Molar mass of iron
= 100/56
= 1.78
We find that 100 grams of sodium contain 4.34 moles of atom whereas 100 grams of iron contain 1.78 moles of atoms. Since 100 grams of sodium has more moles, it contains more atoms than 100 grams of iron.