Question

Determine the number of moles of air present in 1. 35 L at 750 torr and 17. 0°C. Ideal Gas Law formula: PV = nRT(R = 62. 396 L•torr/mol•K) Which equation should you use? P equals StartFraction n R T over V EndFraction. N equals StartFraction R T over P V EndFraction. N equals StartFraction P V over R T EndFraction. What is the number of moles present? mol.

Answer 1

The number of mole of air present is 0.056 mole

Data obtained from the question

• Volume = 1.35 L
• Pressure (P) = 750 torr
• Temperature (T) = 17 °C = 17 + 273 = 290 K
• Gas constant (R) = 62.396 L•torr/mol•K

• Number of mole (n) = ?

How to determine the number of mole

The number of mole present can be obtained by using the ideal gas equation as illustrated below:

PV = nRT

Divide both side by RT

n = PV / RT

n = (750 × 1.35) / (62.396 × 290)

n = 0.056 mole

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