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Thread: Q18 2011

  1. #1
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    Q18 2011

    Can someone do the working for it. I keep getting 122g
    2015 HSC: ENGLISH ADVANCED (90), EXTENSION 1 MATHS(100), EXTENSION 2 MATHS(94), CHEMISTRY(95), PHYSICS(94), SDD(96)
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  2. #2
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    Re: Q18 2011

    No. moles HCl= 24.4/1000 x 0.1= no.moles NaX in 20mL sample ( includes 0.2 g NaX)
    Therefore, Molar mass NaX= mass/no.moles= 0.2 x 1000/ 24.4 x 0.01 = 81.97... (A)

  3. #3
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    Re: Q18 2011

    Let me know if the answer is A though?

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    Re: Q18 2011

    yeah it is. Thanks mate
    2015 HSC: ENGLISH ADVANCED (90), EXTENSION 1 MATHS(100), EXTENSION 2 MATHS(94), CHEMISTRY(95), PHYSICS(94), SDD(96)
    ATAR: 99.55

  5. #5
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    Re: Q18 2011

    I got C. Can you explain what you did and why please?
    Advanced Science & Computer Science - UNSW

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    Set man on fire, and he's warm for the rest of his Life!"

  6. #6
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    Re: Q18 2011

    bump
    Advanced Science & Computer Science - UNSW

    "Give a man a fire, and he's warm for a day.
    Set man on fire, and he's warm for the rest of his Life!"

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