Baseballguy101
  • Baseballguy101
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)
Chemistry
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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Baseballguy101
  • Baseballguy101
@taramgrant0543664
taramgrant0543664
  • taramgrant0543664
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
Baseballguy101
  • Baseballguy101
so i take 21.3/ 6.94

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taramgrant0543664
  • taramgrant0543664
Yep so you get 3 moles of lithium reacting with excess water
taramgrant0543664
  • taramgrant0543664
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
Baseballguy101
  • Baseballguy101
3 moles lithium x 1H / 2Li = 1.52moles H. Correct?
taramgrant0543664
  • taramgrant0543664
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
taramgrant0543664
  • taramgrant0543664
R would be 0.082 thought I should mention that too
Baseballguy101
  • Baseballguy101
ok so the formula would be v = nrt/p. plugging that in would be 1.52moles x 0.082 x 297K / 1.4atm
taramgrant0543664
  • taramgrant0543664
Yes
Baseballguy101
  • Baseballguy101
then which would = 20.97 right?
Baseballguy101
  • Baseballguy101
20.87*
Baseballguy101
  • Baseballguy101
wait I did something wrong i got 26.44
taramgrant0543664
  • taramgrant0543664
Ya I got 26.4 I was trying to figure out how you got that other number lol
Baseballguy101
  • Baseballguy101
im not too sure either haha but thank you!
taramgrant0543664
  • taramgrant0543664
Haha happens to everyone! Happy to help!!

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