O Level Chemistry: Mole Concepts / Chemical Calculations

A very interesting questions sent in by a local students on Mole Calculations / Mole Concepts / Chemical Calculations:

Try this out and leave your suggested answers in the “Comments” section below this post.

Questions:
A sample of sea-water contains 0.1 g/dm^3 of bromide ions.

(i) What volume of this sea-water produces one mole of bromine molecules?

(ii) What volume of chlorine gas is required to produce 8g of bromine from this sea water?

Suggested Answers:

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3 Responses to O Level Chemistry: Mole Concepts / Chemical Calculations
  1. Kay
    September 8, 2009 | 7:33 pm

    I really had difficulty to answer this, …! I m self-teaching AS chemistry .. its tough, and things like this, are pure hard.;. ! but thanks for posting this!

    – from Morocco

    Reply

  2. Kay
    September 13, 2009 | 6:27 pm

    hello i was wondering from where did 80 come from ? thats not avogadro’s number… (6X10^23) then what is it?

    Please reply
    Thnx alot!

    Reply

  3. rose
    October 21, 2010 | 6:22 pm

    that is the relative atomic mass of br-

    Reply

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