Which of the following indicates the least pressure?A) 1 atm B) 777 torr C) 5.5 mm Hg D) 100 kPa E) 12 psi
To determine which of the following indicates the least pressure, we need to compare the units given for each option.
The units for pressure can vary depending on the system of measurement used. In this case, we have a mixture of different units: atm (atmosphere), torr (millimeters of mercury), mm Hg (millimeters of mercury), kPa (kilopascal), and psi (pounds per square inch).
To make a comparison, let's convert all the given units to a common one. In this case, we will use atm (atmosphere).
A) 1 atm = 1 atm
B) 777 torr = 777/760 atm (since 1 atm = 760 torr)
C) 5.5 mm Hg = 5.5/760 atm (since 1 atm = 760 mm Hg)
D) 100 kPa = 100/101.325 atm (since 1 atm = 101.325 kPa)
E) 12 psi = 12/14.696 atm (since 1 atm = 14.696 psi)
Now, we can compare the converted values:
A) 1 atm = 1 atm
B) 777/760 atm ≈ 1.022 atm
C) 5.5/760 atm ≈ 0.00724 atm
D) 100/101.325 atm ≈ 0.9869 atm
E) 12/14.696 atm ≈ 0.816 atm
From the converted values, we can see that option C) 5.5 mm Hg is the smallest, indicating the least pressure. Therefore, the correct answer is C) 5.5 mm Hg.
A cylinder of argon gas contains 125 mol at a pressure of 150 atm and a temperature of 27°C. After some of the
argon has been used, the pressure is 136 atm at 27°C. What mass of argon remains in the cylinder?
A) 4.23 × 103 g B) 113 g C) 5.52 × 103 g D) 4.52 × 103 g E) 5.00 × 103 g