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Greeley [361]
3 years ago
8

A sample of helium gas has a volume of 900. milliliters and a pressure of 2.50 atm at 298 K. What is the new pressure when the t

emperature is changed to 336 K and the volume is decreased to 450. milliliters?
(1) 0.177 atm (3) 5.64 atm
(2) 4.43 atm (4) 14.1 atm
Chemistry
1 answer:
Sergio039 [100]3 years ago
5 0

<span>The combined Boyle's and Charles' gas law says P1V1/T1 = P2V2/T2 </span>

<span>In this case we have (2.5 atm) (900 ml) / 298 K = (P2) (450 ml) / 336 K -----> </span>
<span>7.55 = 1.34P2 -----> P2 = 7.55 / 1.34 = 5.63 atm</span>
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What is the pH of a mixture of 0.042 M NaH2PO4 and 0.058 M Na2HPO4? Hint: The pKa of phosphate is 6.86.
AlekseyPX

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