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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)
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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Baseballguy101
 one year ago
Best ResponseYou've already chosen the best response.0@taramgrant0543664

taramgrant0543664
 one year ago
Best ResponseYou've already chosen the best response.3So 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
 one year ago
Best ResponseYou've already chosen the best response.0so i take 21.3/ 6.94

taramgrant0543664
 one year ago
Best ResponseYou've already chosen the best response.3Yep so you get 3 moles of lithium reacting with excess water

taramgrant0543664
 one year ago
Best ResponseYou've already chosen the best response.3So 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
 one year ago
Best ResponseYou've already chosen the best response.03 moles lithium x 1H / 2Li = 1.52moles H. Correct?

taramgrant0543664
 one year ago
Best ResponseYou've already chosen the best response.3Yes! 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
 one year ago
Best ResponseYou've already chosen the best response.3R would be 0.082 thought I should mention that too

Baseballguy101
 one year ago
Best ResponseYou've already chosen the best response.0ok so the formula would be v = nrt/p. plugging that in would be 1.52moles x 0.082 x 297K / 1.4atm

Baseballguy101
 one year ago
Best ResponseYou've already chosen the best response.0then which would = 20.97 right?

Baseballguy101
 one year ago
Best ResponseYou've already chosen the best response.0wait I did something wrong i got 26.44

taramgrant0543664
 one year ago
Best ResponseYou've already chosen the best response.3Ya I got 26.4 I was trying to figure out how you got that other number lol

Baseballguy101
 one year ago
Best ResponseYou've already chosen the best response.0im not too sure either haha but thank you!

taramgrant0543664
 one year ago
Best ResponseYou've already chosen the best response.3Haha happens to everyone! Happy to help!!
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