An empty water bottle is full of air at 15° c and standard pressure . the volume of the bottle is 0.500 liter . how many moles of air are in a bottle ?

There are 0.0211 moles of air in the bottle

Explanation:

Step 1: Data given

Temperature of air = 15°C = 273.15 + 15 = 288.15 Kelvin

Standard pressure = 1 atm

Volume of the bottle = 0.500 L

Step 2: ideal gas law

p*V = n*R*T

with p = the pressure of the gas = 1 atm

with V = the volume of the bottle = 0.500 L

with n = the number of moles

with R = the gas constant = 0.08206 L*atm/ mol*K

with T = the temperature of the gas = 15 °C = 288.15 Kelvin

In this case we have:

1atm * 0.500L = n * 0.08206  L*atm/ mol*K * 288.15 K

Number of moles n = (1 atm * 0.500 L)/(0.08206  L*atm/ mol*K * 288.15 K)

Number of moles = 0.0211 moles

There are 0.0211 moles of air in the bottle

the seeing the electronic configuration we can say that the element is fluorine.

fluorine is the most electronegative element in the periodic table.

but by only seeing the configuration we cannot say about its reactivity because we don't know if its configuration after excitation or by addition of electrons.

but if not then, it is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. as the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine.