A sample of nitrogen gas in a 8.5-L container at a temperature of 55°C exerts a pressure of 2.9 atm. Calculate the number of moles of gas in the sample.

The number of moles of gas in the sample = 0.916 moles

Explanation:

Step 1: Data given

Volume of the container = 8.5 L

Temperature = 55 °C = 328 K

Pressure = 2.9 atm

Step 2: Calculate the number of moles of gas in the sample.

p*V = n*R*T

⇒with p = the pressure = 2.9 atm

⇒with V = the volume of the container = 8.5L

⇒with n = the number of moles of gas = ?

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

⇒with T = the temperature = 328 K

n = (p*V)/(R*T)

n = (2.9*8.5)/(0.08206*328)

n = 24.65 / 26.91568‬

n =  0.916 moles

The number of moles of gas in the sample = 0.916 moles

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."