itscheesycheedar
16.10.2019 •
Chemistry
A334-ml cylinder for use in chemistry lectures contains 5.363 g of helium at 23 ∘c. you may want to reference (pages 404 - 407) section 10.4 while completing this problem. part a how many grams of helium must be released to reduce the pressure to 65 atm assuming ideal gas behavior?
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Ответ:
7,15 g of helium must be released to reduce the pressure to 65 atm assuming ideal gas behavior
Explanation:
If we assume an ideal gas behaviour we must use the general gas equation.
P.V = n R T
where P is pressure (65 atm)
where V is volume (0,334 L)
n the number of moles (in this case He2)
R the Ideal gas constant (0,082 L.atm/mol.K)
T is temperature in K (ºC + 273) (296K)
We need to convert mL in L for the Ideal gas constant, because we have L as unit, so 334mL /1000 = 0,334 L
65 atm . 0,334 L = n . 0,082 L.atm/mol.K . 296K
(65 atm . 0,334 L) / (0,082 mol.K/L.atm . 296K) = n
Look how the units are cancelled
(21,71 / 24,272) moles = n
0,894 moles = n
Moles . molar mass = gr.
0,894 moles . 8 g/m = 7,15 g
Ответ:
0.65 percent
Step-by-step explanation:
because 13/21 was doing it and therefor you divide 13 by 21 and get 0.65