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Thread: Q18 2011

  1. 3 Oct 2015, 2:58 PM #1
    Mathsisfun15
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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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    Bachelor of Advanced Science at UNSW: major in Physics and WAM of 90.917

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  3. 3 Oct 2015, 3:09 PM #2
    michaelhannigan
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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)
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  4. 3 Oct 2015, 3:10 PM #3
    michaelhannigan
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    Re: Q18 2011

    Let me know if the answer is A though?
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  5. 3 Oct 2015, 4:05 PM #4
    Mathsisfun15
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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

    Bachelor of Advanced Science at UNSW: major in Physics and WAM of 90.917

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  6. 3 Oct 2015, 11:54 PM #5
    Mr_Kap
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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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  7. 4 Oct 2015, 12:44 AM #6
    Mr_Kap
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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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