Question

5. Compare samples of bromine gas and sulfur dioxide gas at 50.00 °C and 0.9000 atm pressure.

Identify which of these gasses has the larger value for each of the following properties. ["neither" means that they both have the same value for that property.]

Select the one answer that is correct in both columns.

higher density -------- higher average molecular velocity:

A. bromine; sulfur dioxide

B. sulfur dioxide; sulfur dioxide

C. bromine; bromine

D. sulfur dioxide; bromine

E. bromine; neither

Answer 1

Q5.

Bromine gas = Br2(g)

Sulfur dioxide gas = SO2(g)

T = 50°C and P = 0.9 atm

larger falue for the next properties:

higher density --> this depends directly in the Molar Mass of the compound, since they both occupy the same volume per unit mol, th eonly thing that changes is the amount of mas per unit mol

so

Molar Mass Br2 = 159.808 g/mol

Molar Mass SO2 = 64.066 g/mol

clearly, the higher density, i.e. more mass per unit volume, will be that of Bromine gas

for

Average molecular velocity

recall that at the same conditions, and same temperature, the energy is the SAME for each atom/molecule

so...

knowing this

we can relate energy to velocity via:

E = 1/2*m*v^2

therefore,mass is veryimportant, for heavy molecules, velocity is prety much lower since it is directly proportional

so

higher velocity ---> SO2 (over Br2)