Chemistry gases?

Question

Equal masses of oxygen (O2) and fluorine (F2) are placed in separate flasks at the same volume and temperature. Which of the following statements is true? Circle the correct answer.

a) Do both flasks contain same number of molecules?

b) Are the molecules of oxygen moving faster than fluorine?

c) Is the pressure in the oxygen flask is higher than the pressure in the fluorine flask?

d) Are more molecules are present in the fluorine flask?

Answer 1

The universal gas law states that P*V = n*R*T, where n = no of moles of the gas. Because the atomic mass of F is more than the atomic mass of O, the same mass of gas there will be fewer atoms of F than O.

Since the temperatures are the same, the average kinetic energy of the molecules, proportional to T, is the same.

Pressure is P = n*R*T/V; R, T, and V are the same, pressure is proportional to n. n is higher for O2 than F2, so the pressure is higher in O2 flask.

See first sentences for the answer to d.

Answer 2

a)No they dn't have same numbers of molecules cause the number of molecules of oxygen less than F, cause O has bogger atomic mass than F
b)pressure is same
c)yes

Answer 3

i believe its D