### 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

• #### 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

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