A quantity of neon gas is slowly heated in a cylinder fitted with a movable piston...
A quantity of neon gas is slowly heated in a cylinder fitted with a movable piston (constant pressure). It is known that 100.0 J of heat is added to the gas and the change in temperature is 4.00 K. How many moles of gas are contained in the cylinder?
Homework Answers
Amount of heat added to the gas, Q = 100 J
The cylinder is fitted with movable piston which implies constant pressure.
At constant pressure, the specific heat capacity of Neon gas, Cp = 1030 J/kg-K
Q = m Cp 
T
100 = m * 1030 * 4
m = 0.02427 kg = 24.27 grams
1 g of Neon gas = 0.04955 moles
24.27 grams = 1.20269 moles
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