# If 60.0L of nitrogen is collected over water at 40.0 degrees celcius when the atmospheric pressure is 760 torr, how many moles of the nitrogen are present? Vapour pressure of water at 40ºc=55.3torr

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Since this volume of gas was collected over water, we would use Dalton's Law of Partial pressure of gases to determine the pressure contributed only by the

We are told that the atmospheric pressure was

Therefore:

Giving

Since we now know the

Before implementing the use of the formula, each quantity must be in their appropriate units hence both

That is

Therefore

Adjusting this figure to 3 sf as given in the values is your question , we obtain

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