A previously calibrated rotometer is being used to measure a gas flow. The old c

Question

A previously calibrated rotometer is being used to measure a gas flow. The old calibration curve is a straight line described by the following equation:
Q=1.10RR-0.50
Where
Q=flow, liters/minute
RR=rotometer readi g, dimensionless
The rotometer was calibrated using ethane (C2H6) at 1.40atm and 60*F. The gas presently bei g used is methane (CH4) at 1.10atm and 100*F.
A. Calculate the true volumetric flow rate of methane in the rotometer whe. The rotometer reads 4.0.
B. Calculate the mass flow rate of methane in g/min.

Explanation / Answer

Q= 1.10 RR - 0.50

rotometer reading for the methane flow = RR= 4.0

Flow rate of gas= 1.10 *4.0 - 0.5 = 4.4-0.5= 3.9 liters/minute>
Flow rate of methane is 3.9 liters per minute.
PV=nRT
P= 1.10

T= 100 degrees Fahrenheit = 310.93 kelvin

R= 0.08205746 LatmK1mol1
V= 3.9 L
n= PV/RT= (1.10*3.9)/(310.93*0.08205746)= 0.1681 mol
Mass= 0.1681*16= 2.69 g
mass flow rate = 2.69 g/ min

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