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

8

explanation:

each principal energy level above the first contains one s orbital and three p orbitals. a set of three p orbitals, called the p sublevel, can hold a maximum of six electrons. therefore, the second level can contain a maximum of eight electrons - that is, two in the s orbital and 6 in the three p orbitals.

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d.) gravity pulled particles of dust and gas together to form planets.