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 Celsius 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 $\frac{V_1}{T_1}=\frac{V_2}{T_2}$, so $V_2=\frac{V_1T_2}{T_1}$

Step2: Calculate the new volume

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

Step1: Convert Celsius to Kelvin

$T = 15.0+273.15 = 288.15\ K$, $n = 1.8\ mol$, $V=2.5\ L$, and the ideal - gas constant $R = 0.0821\ L\cdot atm/(mol\cdot K)$
According to the ideal - gas law $PV = nRT$, so $P=\frac{nRT}{V}$

Step2: Calculate the pressure

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

Answer:

False

Question 4