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Answer:
(a). With fewer molecules in the container, the molecules have lower average speeds.
(b). With fewer molecules per unit volume, the molecules hit the walls of the container less often.
(c). With lower average speeds, on average the molecules hit the walls of the container with less force.
Explanation:
Ideal gas law is given as;
PV = nRT
Where;
P is the pressure of the gas
V is the volume of the gas
n is the number of moles of the gas (amount of gas )
R is ideal gas constant
T is the temperature of the gas
If the amount of gas is decreased, while the volume and temperature are held constant, the pressure will decrease because number of gas moles per unit volume will be reduced, causing the entropy of the gas to be reduced since entropy decreases with decrease in gas molecules.
As the entropy of the gas molecules reduce, the average speed of the gas molecules will be reduced as well, this will cause fewer collision of the gas molecules with the walls of the container ( i.e on average the gas molecules hit the walls of the container with less force since force is directly proportional to speed, and less force implies less pressure since the contact surface is constant).
Choosing all that apply:
- (a). With fewer molecules in the container, the molecules have lower average speeds.
- (b). With fewer molecules per unit volume, the molecules hit the walls of the container less often.
- (c) . With lower average speeds, on average the molecules hit the walls of the container with less force.
Its either nervous or digestive system
Answer:
Energy required is 4.147 kj.
Explanation:
Given data:
Mass of ice = 12.4 g
Temperature = 0°C
Molar heat fusion for ice = 6.02 kj/mol
Energy required to melt = ?
Solution:
Formula:
q = n ×ΔH
q = heat
n = number of moles
ΔH = enthalpy
First of all we will calculate the number of moles.
Number of moles = mass/ molar mass
Number of moles = 12.4 g/ 18 g/mol
Number of moles = 0.69 mol
Now we will put the values in formula.
q = n × ΔH
q = 0.69 mol × 6.02 kj/mol
q = 4.147 kj
Answer:
1.45 mol
Explanation:
Given data
- Volume of the gas (V): 8.77 L
- Temperature of the gas (T): 20 °C
- Pressure of the gas (P): 3.98 atm
Step 1: Calculate the absolute temperature (Kelvin)
We will use the following expression.
Step 2: Calculate the number of moles (n) of the gaseous sample
We will use the ideal gas equation.