Thermodynamics help: 1. Estimate the average speed (mph) of hydrogen molecules a

Question

Thermodynamics help:
1. Estimate the average speed (mph) of hydrogen molecules at 200 K and 3 bars.

2. Estimate the entropy (J/g*k) of steam at 27.5 MPa and 425 Celsius. Thermodynamics help:
1. Estimate the average speed (mph) of hydrogen molecules at 200 K and 3 bars.

2. Estimate the entropy (J/g*k) of steam at 27.5 MPa and 425 Celsius. Thermodynamics help:
1. Estimate the average speed (mph) of hydrogen molecules at 200 K and 3 bars.

2. Estimate the entropy (J/g*k) of steam at 27.5 MPa and 425 Celsius.

Explanation / Answer

(1) Molecular mass of hydrogen, M = 0.002 kg/mol

Temperature, T = 200 K

The average speed of hydrogens

u = (3k N T / M)1/2
= (3 R T / M)1/2

= (3 x 8.3145 x 200 / 0.002)1/2
= 1579.35 m/s                      (Since 1 m/s = 2.236 mph)

= 3532.9 mph (miles per hour)

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