Comments on: O Level Chemistry: Mole Concepts / Chemical Calculations

By: Student Blog Project :: Effective Study Tips, Strategies, and Methods » Blog Archive » Chemistry Question - Mole Concepts/Chemical Calculations

Mon, 31 Mar 2008 04:36:00 +0000

[...] to get the answer? Click here to view the [...]

By: sean

sean — Fri, 21 Mar 2008 06:39:20 +0000

Hi Jennifer,

I congratulate you on your active participation and willingness to open in an open mind. The greatest way of learning is through active participation – where the knowledge will be in-grained into your cellular structures and be life-long.

I am glad that both Gary and yourself and actively correcting and teaching each other. Hope you are enjoying your preparation and find this platform useful.

Keep up the good work!

One who Conquers Oneself,
Sean

By: sean

sean — Fri, 21 Mar 2008 06:32:27 +0000

Hi Gary,

You are spot on for this one! The tricky part of this question is indeed to realise:
1) That “Hydrogen” means H2 gas molecule
2) Mr of “Hydrogen” is 2 instead of 1 (alot of students missed out on this part)

I comgratulate you on your participation. The greatest way of learning is through
active participation – where the knowledge will be in-grained into your cellular
structures.

Keep up the good work!

One who Conquers Oneself,
Sean

By: Jen

Jen — Fri, 21 Mar 2008 04:15:25 +0000

Hi Gary,

Oh! no wonder I could not get the answer. ok, thank you for correcting me!

By: Gary

Gary — Thu, 20 Mar 2008 15:05:13 +0000

Hello Jen,

Answer should be A .

Like what you said,Chlorine has 2 atoms because its Cl2.As such,this should apply to hydrogen too.Right Sean?

But remember,when you find the number of moles of H2…it should be 0.25/2 not 0.25/1.Otherwise,your working is the same as mine! =D