Question 51, Morning Session, Professional Knowledge, 2012
Thread Content
At 30°C and 0.3 MPa, ammonia synthesis gas is compressed to 3 MPa. To calculate the effective energy of the initial state for this process using ideal gas assumptions, which parameters are required? A Inlet pressure: 0.3 MPa B Ambient temperature: 298 K C Ambient pressure: 101.3 KPa D Outlet pressure: 3 MPa. I think the answers are BC. But the answers to the real exam questions online are ABD. On page 78 of the Tianjin University exam textbook, it is clearly stated as “ambient temperature, ambient pressure”.
List out the formula, identify the parameters needed in it – that’s the answer. Believe in yourself!
This question asks for the effective energy of the initial state; when it changes to the ground state, both temperature and pressure change. In other words, both types of effective energy need to be taken into account, and the answer can be obtained by applying the relevant formula. Such a significant statement must surely refer to specific circumstances.