Select the correct answer. The gas in a sealed container has an absolute pressure of 9.25 atmospheres. If the air around the con
tainer is at standard pressure, what is the gauge pressure inside the container? A. 0.759 atm B. 8.25 atm C. 10.25 atm D. 113 atm
2 answers:
Answer: B) 8.25 atm.
Explanation: Absolute pressure is the sum of gauge pressure and atmospheric pressure.
Atmosphere pressure is given as 9.25 atm and the atmospheric pressure is 1.00 atm.
Let's plug in the values in the above formula:
9.25 atm = + 1.00 atm
= 9.25 atm - 1.00 atm
= 8.25 atm
So, gauge pressure inside the container is 8,25 atm and hence the right option is B.
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The question is incomplete, here is the complete question:
A solution contains 0.115 mol and an unknown number of moles of sodium chloride. The vapor pressure of the solution at 30°C is 25.7 torr. The vapor pressure of pure water at this temperature is 31.8 torr. Calculate the number of grams of sodium chloride in the solution. (Hint: Remember that sodium chloride is a strong electrolyte.)
<u>Answer:</u> The mass of sodium chloride in the solution is 0.714 grams
<u>Explanation:</u>
The formula for relative lowering of vapor pressure will be:
where,
= vapor pressure of solvent (water) = 31.8 torr
= vapor pressure of the solution = 25.7 torr
i = Van't Hoff factor = 2
= mole fraction of solute (sodium chloride) = ?
Putting values in above equation, we get:
Mole fraction of a substance is calculated by using the equation:
We are given:
Moles of water = 0.115 moles
To calculate the mass for given number of moles, we use the equation:
Moles of NaCl = 0.0122 moles
Molar mass of NaCl = 58.5 g/mol
Putting values in above equation, we get:
Hence, the mass of sodium chloride in the solution is 0.714 grams