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Ideal gas equation Watch

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    I have this multiple choice question for homework. I used the ideal gas equation to work out the number of moles that were in each answer but I did not get the right answer.
    The correct answer and how to do to it would be appreciated.

    Which of these samples of gas contains the largest number of molecules? The gas constant R = 8.31 J K-1 mol-1.
    A 5.0X10-4 m3 at 1.0x106 Pa and 300 K
    B 4.0X10-3 m3 at 2.0x105 Pa and 400 KC 3.0X101 m3 at 3.0x104 Pa and 500 KD 2.0X102 m3 at 4.0x103 Pa and 600 K

    Thanks in advance.
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    (Original post by cassie05)
    I have this multiple choice question for homework. I used the ideal gas equation to work out the number of moles that were in each answer but I did not get the right answer.
    The correct answer and how to do to it would be appreciated.

    Which of these samples of gas contains the largest number of molecules? The gas constant R = 8.31 J K-1 mol-1.
    A 5.0X10-4 m3 at 1.0x106 Pa and 300 K
    B 4.0X10-3 m3 at 2.0x105 Pa and 400 KC 3.0X101 m3 at 3.0x104 Pa and 500 KD 2.0X102 m3 at 4.0x103 Pa and 600 K

    Thanks in advance.
    Which version of the ideal gas equation did you use and what exactly have you done?
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    (Original post by morgan8002)
    Which version of the ideal gas equation did you use and what exactly have you done?
    I rearranged PV=nRT to n=PV/RT. Then I worked out the moles for each answer. I found that C had the largest number but it was wrong.
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    (Original post by cassie05)
    I rearranged PV=nRT to n=PV/RT. Then I worked out the moles for each answer. I found that C had the largest number but it was wrong.
    That's what I get. You might have dropped some units when copying the question down, so check for that. What did you get for n in each case?
 
 
 
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