Author Question: A 25-L container holds ideal hydrogen (H2) gas at a gauge pressure of 0.25 atm and a temperature of ... (Read 202 times)

genevieve1028 · **on:** Jul 29, 2018

A 25-L container holds ideal hydrogen (H2) gas at a gauge pressure of 0.25 atm and a temperature of 0C.

What mass of hydrogen gas is in this container? The ATOMIC mass of hydrogen is 1.0 g/mol, the ideal gas constant is R = 8.314 J/mol K = 0.0821 L atm/mol K, and 1.00 atm = 101 kPa.
A) 1.4 g
B) 2.8 g
C) 4.2 g
D) 5.6 g
E) 6.3 g

Question 2

It is a well-known fact that water has a higher specific heat than iron. Now, consider equal masses of water and iron that are initially in thermal equilibrium. The same amount of heat, 30 calories, is added to each one. Which statement is true?

A) They remain in thermal equilibrium.
B) They are no longer in thermal equilibrium; the iron is warmer.
C) They are no longer in thermal equilibrium; the water is warmer.
D) It is impossible to say without knowing the exact mass involved.
E) It is impossible to say without knowing the exact specific heats.