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Baseballguy101

  • one year ago

If 21.3 grams of lithium react with excess water, how many liters of hydrogen gas can be produced at 297 Kelvin and 1.40 atmospheres? Show all of the work used to solve this problem. 2 Li (s) + 2 H2O (l) yields 2 LiOH (aq) + H2 (g)

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  1. Baseballguy101
    • one year ago
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    @taramgrant0543664

  2. taramgrant0543664
    • one year ago
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    So your first step is to determine the moles of lithium to do this you take the mass (21.3g) divided by the molar mass of lithium

  3. Baseballguy101
    • one year ago
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    so i take 21.3/ 6.94

  4. taramgrant0543664
    • one year ago
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    Yep so you get 3 moles of lithium reacting with excess water

  5. taramgrant0543664
    • one year ago
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    So now we look at the stoichimometric coefficients. The ratio between lithium to hydrogen gas is 2:1. We found in the previous step that there are 3 moles of lithium so using the ratio we can relate to determine how many moles of hydrogen gas are produced. So how many moles of hydrogen gas are produced

  6. Baseballguy101
    • one year ago
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    3 moles lithium x 1H / 2Li = 1.52moles H. Correct?

  7. taramgrant0543664
    • one year ago
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    Yes! So now you can put it into the ideal gas formula PV=nRT where P=1.4atm, n is the moles you solved for, R is the ideal gas constant and T is your temperature and solve for V your volume

  8. taramgrant0543664
    • one year ago
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    R would be 0.082 thought I should mention that too

  9. Baseballguy101
    • one year ago
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    ok so the formula would be v = nrt/p. plugging that in would be 1.52moles x 0.082 x 297K / 1.4atm

  10. taramgrant0543664
    • one year ago
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    Yes

  11. Baseballguy101
    • one year ago
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    then which would = 20.97 right?

  12. Baseballguy101
    • one year ago
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    20.87*

  13. Baseballguy101
    • one year ago
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    wait I did something wrong i got 26.44

  14. taramgrant0543664
    • one year ago
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    Ya I got 26.4 I was trying to figure out how you got that other number lol

  15. Baseballguy101
    • one year ago
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    im not too sure either haha but thank you!

  16. taramgrant0543664
    • one year ago
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    Haha happens to everyone! Happy to help!!

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