chemistry PLEASE HELPPPP

10.0 grams of carbon dioxide and 20.0 grams of oxygen are mixed in a 50.0 L container at 30.0 degrees celcius. What is the pressure of this mixture in mm Hg? I defined my variables. so i had Mass=30.0g Volume=50.0L Temperature=303 Kelvin pressure=x.
then i used PV*GFM=mRT.
(x)(50.0L)(60)=30.0G(62.4)(303). The correct answer is 322 mmHG. But i'm not getting that. can anyone help? thanks:)

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  1. Do the O2 and the CO2 SEPARATELY.
    Add the two pressures at the end to get total pressure.

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  2. okay thanks:) I really appreciate your help:)

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  3. I didn't get the right answer....

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  4. First CO2
    10 grams CO2 is how many moles?
    C = 12
    O2 = 32
    CO2 = 44 grams per mole
    so
    n of CO2 = 10/44 = .227 moles
    P V = n R T
    P of CO2 = .227 R ( T/V)
    NOW O2
    20 grams O2
    32 grams / mole
    so 20/32 = .625 moles O2
    P of O2 = .625 R (T/V)

    add P of CO2 to P of O2 to get total pressure

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  5. we learned that R is 62.4mmHG. so how would i do the problem using that value?

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  6. hmm
    in chemistry units usually R = .08206 liter atmospheres / moles degree Kelvin
    let me see if I can convert that to mm Hg

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  7. OK, multiply by 760 mm Hg / atm and I get
    R = 62.37 L mmHg/mol deg K
    now I will try to do it your class' way

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  8. you're right .0821 is atm and 8.31 is kPa and 62.4 is mmHG.

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  9. this is what i tried doing, (x)(50.0)(44)=(20.0)(62.4)(303) for carbon dioxide then i did the same for water but plugged in different numbers for the GFM and the grams.

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  10. First CO2
    10 grams CO2 is how many moles?
    C = 12
    O2 = 32
    CO2 = 44 grams per mole
    so
    n of CO2 = 10/44 = .227 moles
    P V = n R T
    P of CO2 = .227 R ( T/V)
    P of CO2 = .227* 62.4 * 303/50 = 85.83
    NOW O2
    20 grams O2
    32 grams / mole
    so 20/32 = .625 moles O2
    P of O2 = .625 R (T/V) =.625*62.4*303/50 = 236.34
    sum = P = 236 + 86 = 322 mmHg
    I agree

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  11. THANK YOU DAMON, YOU'RE THE MANNN!!!

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  12. Not water, CO2 and O2

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  13. huhh, what??

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