ce 2007 Q14

2010-04-20 2:07 am
How many moles of ethane contain y hydrohen atom?
(L = the avogadro's constant)


1. y/L

2. L/y

3. y/6L

4. 6y/L

P.S. please show the steps, thx!

回答 (1)

2010-04-20 2:57 am
✔ 最佳答案
The answer is 3. y/6L.

Each C2H6 molecule contains 6 H atoms.
No. of C2H6 molecules = y/6

Each mole of C2H6 molecules contains L molecules.
No. of moles of C2H6 = (y/6)/L = y/6L
參考: fooks


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