What is the total number of electrons present in one mole of ethane?

$10 \ g$ each of $CO_2$,$NH_3$,and $O_2$ were taken in three separate flasks. What is the correct decreasing order of the number of atoms?

What is the weight in $g$ of $2.01 \times 10^{23}$ molecules of $CO$?

What is the mass in $kg$ of $5$ mole of acetic acid $(mol. mass = 60 \ g \ mol^{-1})$ (in $kg$)?

What is the number of $CO_2$ molecules in $45.42 \ L$ at $\text{STP}$? (Consider molar volume of gas at $\text{STP} = 22.71 \ L \ mol^{-1}$)

If every person on Earth is given $100$ molecules of sugar,how much sugar $(C_{12}H_{22}O_{11})$ is required? (Assume the population of Earth is $3 \times 10^{10}$ and the molar mass of sugar is $342 \ g/mol$)