Gas Laws
Gas Laws
Gas Laws
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Solve for V 2 as in Sample Problem 4.<br />
3. COMPUTE<br />
Determine the pressure of chlorine alone.<br />
Calculate the volume of Cl 2 at STP.<br />
4. EVALUATE<br />
• Are the units correct? Yes; the units canceled leaving the<br />
correct units, L.<br />
• Is the number of significant Yes; the number of significant figfigures<br />
correct? ures is correct because the data were<br />
given to a minimum of three significant<br />
figures.<br />
• Is the answer reasonable? Yes; the pressure decreased, so the<br />
volume had to increase.<br />
PRACTICE<br />
V 2 <br />
calculated<br />
above given<br />
P1 T2V1 P 2 T 1<br />
given<br />
P 1 P total P H2O vapor 156.5 kPa 2.19 kPa 154.3 kPa<br />
154.3 kPa 273 K 1.45 L<br />
101.3 kPa 292 K<br />
2.06 L<br />
In each of the following problems, assume that the molar quantity of gas<br />
does not change.<br />
1. Some hydrogen is collected over water<br />
at 10°C and 105.5 kPa pressure. The<br />
total volume of the sample was 1.93 L.<br />
Calculate the volume of the hydrogen<br />
corrected to STP. ans: 1.92 L<br />
2. One student carries out a reaction that<br />
gives off methane gas and obtains a total<br />
volume by water displacement of 338 mL<br />
at a temperature of 19°C and a pressure<br />
of 0.9566 atm. Another student does the<br />
identical experiment on another day at<br />
a temperature of 26°C and a pressure ans: The second student<br />
of 0.989 atm. Which student collected collected more<br />
more CH4? CH4. <br />
V 2<br />
<strong>Gas</strong> <strong>Laws</strong> 133
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