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Thread: mole

  1. #1
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    mole

    yo can someone show the wrking out for the following questions

    a student was given a sample of 2.3g of the compound NO2. How many:
    - atoms were in the sample provided (answer: 9.0 x 10^22 atoms)
    - atoms of oxygen were in the sample provided (answer: 6.0 x 10^22 atoms)
    - moles of oxygen were in the sample in the sample provided (answer: 0.10 moles)

    AND

    Q: how many atoms are there in 36g of water?
    A: 3.6 x 10^24 atoms (2 sig. fig.)


    AND

    Q: how many moles of Ag+ ions are there in 3.71 moles of AgNo3?
    A: 3.71 mol (3 sig. fig.)
    Last edited by fires; 8 Mar 2018 at 11:29 PM.
    Assessment Task 1 = (96.67x30)/100 = 29/30
    Assessment Task 2 = (80x25)/100 = 20/25
    Assessment Task 3 = (90x20)/100 = 18/20
    Assessment Task 4 = (92x25)/100 = 23/25
    Now - 29+20+18+23 = 90
    Final raw assessment mark = 90

  2. #2
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    Re: mole

    Hope that helps

    Sent from my SM-G935F using Tapatalk
    nh0j likes this.
    HSC 2018: 3U | 4U | Chemistry | Physics | Advanced English |
    ATAR Goal: 95.00+ (98 ideal)

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