Each of the following errors could be made in the experiment. Specify if the exp

Question

Each of the following errors could be made in the experiment. Specify if the experimentally calculated value of the molar mass of natural gas would be higher, lower, or remain the same if these errors were made. a. The recorded temperature was lower than the actual temperature. b. The stopper was not pushed in far enough when measuring the volume of the flask. c. Natural gas did not flow into the Erlenmeyer flask for a sufficient amount of time. d. The pressure used in your calculations was higher than the actual pressure. The volume of the lecture hall in PS-101 is approximately 753 L. Using today's atmospheric pressure and temperature, calculate the number of moles of gas in the lecture hall.

Explanation / Answer

Q1.

molar mass of natural gas is related to:

Q = n¨*HRxn

then HRxn is constant, so Q and n will be the variables

a) if T is lwoer than actual T, then this will account for a lower amount of moles

b) if stopper is not working properly, the volume will not recover enough moles, therefore, the Q lowers,

c) if not enough gas, not enough burning material, therefore, less heat will be measured, therefore it lowers

d) it P is higher, then moles of gas will be lower in reality, then Q accounts larger ( incorrectly)

Q2.

V = 753 L

assume --> P = 1 atm, T = 25°C = 298 K

then

n = PV/(RT) = 1*753/(298*0.082) = 30.81 moles of air

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