What is the outlet temperature and velocity of the gas, Chemistry

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What is the outlet temperature and velocity of the gas

Air at 30 celcius and 2 MPa flows at steady state in a horizontal pipeline with a velocity of 25m/s . it passes through a throttle valve where the pressure is reduced to 0.3 MPa . the pipe is the same diameter upstream and down stream of the valve. what is the outlet temperature and velocity of the gas? assume air is an ideal gas with a temperature independant Cp=7R/2 and the average molecular weight of air is 28.8

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