Thermodynamics/ throttling question?

Posted on 1970-01-01 00:00:00 in Engineering by ALEX GPRD

The question given is: 

Carbon dioxide enters a throttling device at 2 m/s. If h1 = 2,834,000 J/kg and h2 = 2,824,900 J/kg determine the exit velocity of carbon dioxide. 

My teacher gave us the following formula for throttling questions: 

0 = ṁ(ΔH + ΔKE) 

So a change in H is given as is the initial velocity, but I am unsure of how to find mass to solve this problem.

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