Q 10-13, with explanation please. Which gas molecules have the highest average k

Question

Q 10-13, with explanation please.

Which gas molecules have the highest average kinetic energy at a given temperature? A) HBr B) NO2 C) C2H6 D) They are all moving at the same speed E). None of the above 11. A sample of a real gas acts more like an ideal gas when the volume is increased at constant temperature. Why does this happen? A) The molecules are farther apart, so the attractive or the repulsive forces are less of a factor B) Collisions between molecules are less forceful after the decrease in pressure C) When volume expands the molecules of a real gas get bigger, so they behave more like an ideal gas D) A and C are correct E) All are correct

Explanation / Answer

11) Answer would be D , because in an ideal gas, we want the intermolecular forces, as well as the volume of the molecules compared to the volume of the container, to be as insignificant as possible.

12) C is correct;I- Element; II-element; III-homogenous mixture; IV-heterogeneous mixture

13) D is correct

moles O = 48/ 16 = 3

moles X = 2 x 3/5= 1.2

mass X = 64.8 - 48=16.8 g

molar mass X = 16.8/1.2=14 g/mol

X is nitrogen

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