1. You have a container that has a volume of 1 liter, and holds 1 mole of helium
ID: 530981 • Letter: 1
Question
1. You have a container that has a volume of 1 liter, and holds 1 mole of helium gas.
You compress this container to a new volume of 0.5 liters. No gas escapes.
What happens, and why?
Pressure decreases because the volume has decreased. Collision frequency is reduced.
2. You have a sealed container filled with 1 mole of helium gas.
You heat this container.
Pressure increases.
Why?
The helium gas molecules move faster when they are at a higher temperature. This makes the force of collisions increase, thereby increasing pressure
3. How much energy is required to heat a 12.00 g block of ice at -72.00 °C into steam at 100.00 °C? Express your answer in Joules.
-The specific heat of ice is 2.092 J/g°C
-The specific heat of water is 4.184 J/g°C
- The enthalpy of vaporization of water is 2.26 kJ/g
-The enthalpy of fusion for water is 0.334 kJ/g
Explanation / Answer
Ans 1.A) Pressure increases because the volume has decreased .Collision frequency is higher.
According to the ideal gas law , pV = nRT
where p is pressure , V is volume , n is number of moles of gas , r is universal gas constant and T is temperature,
The pressure of the gas is inversely related to the volume .
So if the volume is decreased , the pressure will increase and they will collide with each other and with the walls of container more often so that means the collision frequency increases.
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