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    Ok, this is a question from my chemistry mock, I'll provide any information needed, I need to know how to work this out - in case it's in my real GCSE tomorrow. So help would be greatly appreciated!

    Oops - forgot the formula of the compound! it's Ca Cl2 O2
    Relative atomic masses:

    Oxygen = 16, Chlorine = 35.5 Calcium = 40.

    I already worked out that the relative atomic mass of calcium hypochlorite is 143.

    The percentage by mass of chlorine in calcium hypochlorite works out to be: 49.7% - I worked that out too.

    What I'm having difficulty with is:

    They're asking me to calculate the mass of chlorine in a 20g tablet of calcium hypochlorite.

    Can anyone shed light on how to do this?
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    You've worked out that the 49.7% of the mass of calcium hypochlorite is due to chlorine. So the mass of chlorine in a 20 g sample is simply 49.7 % of 20 g
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    Oh my god, I love you. Thank you so much! I have been near-tears over this question for hours, and you've solved it for me in less than 5 minutes! I'm going to rep you, if I can!
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    You're welcome . Good luck with your exam tomorrow.

    EDIT: Lol you actually neg repped me but don't worry about it.
 
 
 
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