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       #Post#: 93--------------------------------------------------
       Chemistry
   DIR By: Kizitombano
       Date: April 24, 2012, 3:26 pm
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       1). a car tyre,pumped in the morning at 10 degree C to a
       pressure of 0.20N per mm squared, increases in pressure as its
       temperature rises. if the temperatures reaches 18 degree C,what
       is the new pressure,the volume being constant?
       2). 400cm cubed of nitrogen at 30 degree C is heated at constant
       pressure to a temperature of 50 degree C find the new volume of
       hydrogen..
       please i need the answers today.
       #Post#: 94--------------------------------------------------
       Re: Chemistry
   DIR By: Michel
       Date: April 24, 2012, 4:10 pm
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       For question 1.
       Use the pressure law
       P1/T1 =P2/T2
       You have the initial pressure, ie the pressure in the morning as
       0.2N/mm
       The initial temperature, 10'C, convert into Kelvin temperature
       then you have the final temperature as 18'C, convert this to
       kelvin
       The remaining variable is the final pressure, P2. You can now
       solve for P2.
       For Question 2.
       Use charle's law, V1/T1=V2/T2
       V1 is the initial volume, 400cm3
       T1=initial temperature=30'C, convert to K.
       T2=50'C, convert to K
       then solve for V2
       
       --- Quote from: Kizitombano link ---
       >
       > find the new volume of hydrogen..
       >
       --- End Quote ---
       #Post#: 95--------------------------------------------------
       Re: Chemistry
   DIR By: Michel
       Date: April 24, 2012, 4:11 pm
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       In question 2
       Volume of hydrogen? We were talking about Nitrogen
       #Post#: 96--------------------------------------------------
       Re: Chemistry
   DIR By: Kizitombano
       Date: April 24, 2012, 4:51 pm
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       that mistake was from me... i meant to type nitrogen not
       hydrogen..
       #Post#: 97--------------------------------------------------
       Re: Chemistry
   DIR By: Kizitombano
       Date: April 24, 2012, 5:43 pm
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       that mistake was from me... i meant to type nitrogen not
       hydrogen..
       #Post#: 99--------------------------------------------------
       Re: Chemistry
   DIR By: Michel
       Date: April 24, 2012, 6:04 pm
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       [/quote]
       --- Quote from: Kizitombano link ---
       >
       > that mistake was from me... i meant to type nitrogen not
       hydrogen..
       >
       --- End Quote ---
       yes, but
       --- Quote from: Michel link ---
       >
       >
       > For Question 2.
       > Use charle's law, V1/T1=V2/T2
       > V1 is the initial volume, 400cm3
       > T1=initial temperature=30'C, convert to K.
       > T2=50'C, convert to K
       > then solve for V2
       >
       > [quote author=Kizitombano link=topic=83.msg93#msg93
       date=1335299193]
       >
       >
       --- End Quote ---
       Can you see that we have V1,T1 and T2, all that's left is V2 so
       we substitute V1,T1 and T2 into the equation to get V2
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