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question 11 n9 trial

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fathiah amran
Fairuz Saiyida Saidin
hazirah ahmad
miadisini10
anissuaidah
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question 11 n9 trial Empty question 11 n9 trial

Post by anissuaidah Thu Sep 02, 2010 6:59 am

why the volume of oxygen is 12dm3???
why not 24 dm3?? Twisted Evil
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question 11 n9 trial Empty hm.suai

Post by miadisini10 Thu Sep 02, 2010 7:01 am

thats why .i also dont know how to do this question .Sad
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Post by hazirah ahmad Thu Sep 02, 2010 7:02 am

because oxygen has 1 mole.hydrogen peroxide has 2 mole. so must divide by two
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Post by Fairuz Saiyida Saidin Thu Sep 02, 2010 7:03 am

i answered 48 dm3..... who got the same answer with me? Question
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Post by fathiah amran Thu Sep 02, 2010 7:04 am

OH OK! like that ahhh, afro

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question 11 n9 trial Empty Guide to answer Question 11

Post by Admin Thu Sep 02, 2010 7:04 am

Look at the chemical equation.

1) What is the relationship between number of moles hydrogen peroxide & oxygen gas?
2) When one mole of hydrogen peroxide is decomposed, find the moles of oxygen gas produced.
3) Find the volume of gas by using relationship with Avogadro Constant

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question 11 n9 trial Empty Question 11

Post by fatin izzati>kurtdorisia Thu Sep 02, 2010 7:05 am

2 mol of H2O2 produce
1 mol of O2
so volume of 1 mol of gas is 24 dm3
then volume of 1 mol of O2 is
24 divide 2 = 12dm3
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question 11 n9 trial Empty hmm.....

Post by azie noo Thu Sep 02, 2010 7:05 am

i got it correct...
check no of mole die btol2
2 mol of H2O2 = 1 mol of O
hence.. 1 mol of H2O2 = 1/2 mol of O .. okayh Very Happy

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Post by diyana adibah Thu Sep 02, 2010 7:07 am

my answer is 24..
but now i understand Very Happy
thanks !
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Post by anissuaidah Thu Sep 02, 2010 7:08 am

got the answer already..tq.. lol!
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Post by nur farah anis Thu Sep 02, 2010 7:11 am

0.5x24= 12.. you have to do based on the equation... then..u can see the works clearly..
flower
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