A compound has a critical temperature of 1157 K and a critical pressure of 5.67 MPa. What are its reduced properties at 273.15 K and 0.1 MPa (STP)?
A. 3.88, 56.7
B. 0.236, 0.0179
C. 0.236, 0.0176
D. 0.258, 0.018
E. None of these
A. Incorrect. You have your formulas for reduced properties upside down.
B. Incorrect. You miscalculated and used 1 atm instead of 1 bar in performing the calculation for Pr.
C. Correct. Dividing 273.15 K and 0.1 MPa (STP) into the critical properties provides these values.
D. Incorrect. This reduced temperature corresponds to 25 °C (298 K).
E. Incorrect. One of these sets of numbers is correct. Note that reduced properties are unitless because they are a ratio of two variables with the same units, similar to a mass fraction or a percentage.
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