Question

question 3
10 pts
true or false? when the temperature of a gas in a 8 - l balloon drops from 50 degrees celsius to 25 degrees celsius, the volume decreases to 4 l.
true
false
question 4
10 pts
calculate the pressure of 1.8 moles of oxygen in a 2.5 l gas tank kept at 15.0°c.
17 atm
56 atm
33 atm
0.89 atm

Explanation:

Question 3

Step1: Convert temperatures to Kelvin

$T_1 = 50 + 273.15=323.15$ K, $T_2=25 + 273.15 = 298.15$ K, $V_1 = 8$ L. According to Charles's law $\frac{V_1}{T_1}=\frac{V_2}{T_2}$ for a constant - pressure and amount of gas.

Step2: Solve for $V_2$

$V_2=\frac{V_1T_2}{T_1}=\frac{8\times298.15}{323.15}\approx7.39$ L $
eq4$ L

Step1: Convert temperature to Kelvin

$T=15.0 + 273.15=288.15$ K, $n = 1.8$ mol, $V = 2.5$ L. Use the ideal - gas law $PV=nRT$, where $R = 0.0821$ L$\cdot$atm/(mol$\cdot$K).

Step2: Solve for $P$

$P=\frac{nRT}{V}=\frac{1.8\times0.0821\times288.15}{2.5}\approx17$ atm

Answer:

False

Question 4