#1: The following question appears on a quiz: "A 1.0 L balloon has a pressure of 153 kPa at a temperature of 60°C. How many moles of gas are inside the balloon?" A student answers 0.31 moles. Which of the following explanations is true?

AThe student used the wrong value for R, and the answer should be 5.60 moles.

BThe student used the wrong temperature units, and the correct answer should be 0.06 moles.

CThe student's answer is correct.

DThe student used the wrong volume, and the answer should be 5.60 moles.

Option B.The student used the wrong temperature units, and the correct answer should be 0.06 moles.

Use the ideal gas equation: pV = nRT

V= 1.0L
p = 153 kPa
T = 60 °C + 273.15 = 333.15 K
n = ?

n = [pV] / [RT]

R = 0.082 atmL / Kmole

n = [153 kPa 1atm / 101.325 Kpa 1.0L] / [0.082 atmL / Kmole * 333.15 k] =

n = 0.06 mole

If you incorrectly use T = 60, the result is 0.31mole.

The error is to use T in celsius. T must be used in Kelvin.

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