Question

Which must be the same when comparing 1 mol of oxygen gas, O2, with 1 mol of carbon monoxide gas, CO? the mass the volume the number of molecules the number of oxygen atoms

Answer 1

Answer : The correct option is, the number of molecules.

Explanation :

As we are given that 1 mole of oxygen gas, $(O_2)$ and 1 mole of carbon monoxide gas, (CO).

From the given options, the number of molecules must be same when comparing 1 mole of oxygen gas, $(O_2)$ and 1 mole of carbon monoxide gas, (CO) because there are 2 molecules present in both oxygen gas and carbon monoxide gas.

The mass of 1 mole of oxygen gas, $(O_2)$ is, 32 g and the mass of 1 mole of carbon monoxide gas, (CO) is, 28 g. So, the mass will not be same.

The number of oxygen atoms in 1 mole of oxygen gas, $(O_2)$ is, $2\times 6.022\times 10^{23}$ and the number of oxygen atoms in 1 mole of carbon monoxide gas, (CO) is, $1\times 6.022\times 10^{23}$. So, the number of oxygen atoms will not be same.

The volume of 1 mole of oxygen gas, $(O_2)$ and 1 mole of carbon monoxide gas, (CO) will not be same due to the difference in the masses.

Hence, the correct option is, the number of molecules.

Answer 2

The number of molecules because 1 mol is equal to 6.02x10^23 molecules, therefore they both have the same amount of molecules because they both have 1 mol