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Parents Pricing Home Leaving Cert Chemistry Stoichiometry, Formulae & Equations From July 2008 changes will apply to the way in which taxes are levied on new cars bought in Ireland
From July 2008 changes will apply to the way in which taxes are levied on new cars bought in Ireland - Leaving Cert Chemistry - Question (b) - 2008 Question (b)
View full question From July 2008 changes will apply to the way in which taxes are levied on new cars bought in Ireland. Vehicles that, in controlled tests, have higher levels of carbo... show full transcript
View marking scheme Worked Solution & Example Answer:From July 2008 changes will apply to the way in which taxes are levied on new cars bought in Ireland - Leaving Cert Chemistry - Question (b) - 2008
Calculate the mass of CO2 Only available for registered users.
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To find the mass of CO2 produced per day, use the formula:
e x t M a s s o f C O 2 = e x t E m i s s i o n p e r k m i m e s e x t D i s t a n c e t r a v e l l e d ( k m ) ext{Mass of } CO2 = ext{Emission per km} imes ext{Distance travelled (km)} e x t M a sso f CO 2 = e x t E mi ss i o n p er km im ese x t D i s t an ce t r a v e ll e d ( km )
Substituting the values:
e x t M a s s o f C O 2 = 143 e x t g / k m i m e s 8 e x t k m = 1144 e x t g ext{Mass of } CO2 = 143 ext{ g/km} imes 8 ext{ km} = 1144 ext{ g} e x t M a sso f CO 2 = 143 e x t g / km im es 8 e x t km = 1144 e x t g
Calculate the number of moles of CO2 Only available for registered users.
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The number of moles of CO2 can be calculated using the formula:
ext{Moles of } CO2 = rac{ ext{Mass of } CO2}{ ext{Molar mass of } CO2}
The molar mass of CO2 is approximately 44 g/mol. Therefore:
ext{Moles of } CO2 = rac{1144 ext{ g}}{44 ext{ g/mol}} ext{ } = 26 ext{ moles}
Calculate the volume of CO2 at room temperature and pressure Only available for registered users.
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At room temperature and pressure (RTP), one mole of gas occupies approximately 24 liters. Thus, the volume of CO2 produced is:
e x t V o l u m e o f C O 2 = e x t M o l e s o f C O 2 i m e s 24 e x t L / m o l ext{Volume of } CO2 = ext{Moles of } CO2 imes 24 ext{ L/mol} e x t V o l u m eo f CO 2 = e x t M o l eso f CO 2 im es 24 e x t L / m o l
Calculating this gives:
e x t V o l u m e o f C O 2 = 26 e x t m o l e s i m e s 24 e x t L / m o l = 624 e x t L ext{Volume of } CO2 = 26 ext{ moles} imes 24 ext{ L/mol} = 624 ext{ L} e x t V o l u m eo f CO 2 = 26 e x t m o l es im es 24 e x t L / m o l = 624 e x t L
Calculate the additional litres of CO2 for the SUV Only available for registered users.
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For the large SUV with a CO2 emission rating of 264 g/km:
First, calculate the mass of CO2:
e x t M a s s o f C O 2 = 264 e x t g / k m i m e s 8 e x t k m = 2112 e x t g ext{Mass of } CO2 = 264 ext{ g/km} imes 8 ext{ km} = 2112 ext{ g} e x t M a sso f CO 2 = 264 e x t g / km im es 8 e x t km = 2112 e x t g
Likewise, calculate the number of moles:
ext{Moles of } CO2 = rac{2112 ext{ g}}{44 ext{ g/mol}} = 48 ext{ moles}
Now, the volume of CO2 produced by the SUV:
e x t V o l u m e o f C O 2 = 48 e x t m o l e s i m e s 24 e x t L / m o l = 1152 e x t L ext{Volume of } CO2 = 48 ext{ moles} imes 24 ext{ L/mol} = 1152 ext{ L} e x t V o l u m eo f CO 2 = 48 e x t m o l es im es 24 e x t L / m o l = 1152 e x t L
Finally, the additional volume of CO2 produced by the SUV compared to the diesel car:
e x t A d d i t i o n a l V o l u m e = 1152 e x t L − 624 e x t L = 528 e x t L ext{Additional Volume} = 1152 ext{ L} - 624 ext{ L} = 528 ext{ L} e x t A dd i t i o na l V o l u m e = 1152 e x t L − 624 e x t L = 528 e x t L Join the Leaving Cert students using SimpleStudy...97% of StudentsReport Improved Results
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