Question

which of the following gases would have the highest average molecular speed at 25°C?

a. O2
b. n2
c. ch4
d. sf6
e. co2

Answer 1

Answer is: c) CH₄.
Average speed is inversely proportional to the molar mass, ligher molecules travel faster. Calculate molar mass of all molecules:
a) M(O₂) = 2·16 = 32g/mol.
b) M(N₂) = 2·14 = 28 g/mol.
c) M(CH₄) = 12 + 4·1 = 16 g/mol.
d) M(SF₆) = 32 + 6·19 = 146g/mol.
e) M(CO₂) = 12 + 2·16 = 44g/mol.

Answer 2

The gases which have the highest average molecular speed at 25°C is methane gas as it has lowest molar mass.

What is the relation between average speed & mass?

Average speed of any molecular species is inversely proportional to the molar mass of that molecule, as the mass of the molecule increases they feel difficulty in the movement process.

Molar mass of O₂ = 32g/mol

Molar mass of N₂ = 28 g/mol

Molar mass of CH₄ = 16 g/mol

Molar mass of SF₆ = 146g/mol

Molar mass of CO₂ = 44g/mol

From the above data it is clear that molar mass of methane is lowest so that it has highest average molecular speed.

Hence methane gas has highest average molecular speed.

To know more about average molecular speed, visit the below link:

https://brainly.com/question/15907052

#SPJ3