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Higher - Gas Volumes Question

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  • Message 1. 

    Posted by MissChemTeacher_Bitesize (U15172316) on Tuesday, 6th November 2012

    Hey Guys!

    A wee question on gas volumes to get you thinking:

    Silver (I) oxide decomposes when heated as shown in the equation below.
    2Ag₂O --------> 4Ag + O₂

    Calculate the mass of silver (I) oxide that would release 120cm³ of oxygen, measured at room temperature and pressure. (The molar Volume of Oxygen in 24.0 litres per mole)

    I'll post a solution in a few days.

    Miss_Chem smiley - cool

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  • Message 2

    , in reply to message 1.

    Posted by MissChemTeacher_Bitesize (U15172316) on Saturday, 10th November 2012

    Solution to the problem:

    2Ag₂O --------> 4Ag + O₂

    Number of moles of oxygen = volume / molar volume
    Number of moles of oxygen = 0.12 / 24.0
    Number of moles of oxygen = 0.005 moles

    Looking at the ratios:…..O₂……..:………2Ag₂O
    Looking at the ratios:……1…………………….2
    n of moles from Q:……….0.005 ------> 0.01 moles

    mass of silver oxide = number of moles x gfm
    mass of silver oxide = 0.01 x 231.8
    mass of silver oxide = 2.318g

    Hope this helps you out Miss_Chem smiley - cool

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