F.4 Chemistry mole concept 問題

let the relative atomic mass of X=r
since 1 mole of XO2 canotain 3 mole of atoms and
1 mole of XO3 contain 4 mole of atoms
also 1 mole of XO2 contains the same number of atoms as 60 g of XO3
the molar mass of XO3=(r+48)
no of mole of XO3 =60/(r+48)
所以(請用符號)
3=4[60/(r+48)]
3r+144=240
3r=96
r=32
therefor,the molar mass of XO2 =32+32=64
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點解會係咁呢?
因為XO2可以理解成X+2O ------->XO2
即1mole XO2有3mole既atoms(因為一開始唔知x係咩 所以上面條式最好都唔好寫 因為好大機會都錯)
同樣道理 1 mole既 XO3有4 mole atoms
題目又話 60g既XO3 與1mole既XO2 有相同數目既atoms
所以就可以用方程解決了