An open flask sitting in a lab refrigerator looks empty, but it is actually filled with a mixture of gases called air. If the flask volume is 2.00 L, and the air is at standard temperature and pressure, how many gaseous molecules does the flask contain?

molecules are there in the flask

Explanation:

According to the ideal gas equation:

P = Pressure of the gas = 1 atm    

V= Volume of the gas = 2.00 L

T= Temperature of the gas = 273 K    

R= Gas constant = 0.0821 atmL/K mol

n= moles of gas

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number of particles.

1 mole of gaseous air contains =   molecules

11.2 moles of gaseous air contains =   molecules

gaseous molecules are contained in the flask.

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6

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