An open flask sitting in a lab fridge looks empty, but it is filled with a mixture of gases called air. Calculate the number of molecules of gas the flask contains if the flask volume is 2.50 L , and the air is at standard temperature and pressure (STP).

The number of molecules of gas the flask contains is

Explanation:

According to ideal gas equation:

P = pressure of gas = 1 atm   (STP)

V = Volume of gas = 2.50 L

n = number of moles  = ?

R = gas constant =

T =temperature = 273K (STP)

According to Avogadro's law:

1 mole of gas at STP contains = molecules

Thus 0.112moles of gas at STP contains = molecules

The number of molecules of gas the flask contains is

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