which must be the same when comparing 1 mol of oxygen gas, o₂, with 1 mol of carbon monoxide gas, co?\n the…

which must be the same when comparing 1 mol of oxygen gas, o₂, with 1 mol of carbon monoxide gas, co?\n the mass\n the volume\n the number of molecules\n the number of oxygen atoms

which must be the same when comparing 1 mol of oxygen gas, o₂, with 1 mol of carbon monoxide gas, co?\n the mass\n the volume\n the number of molecules\n the number of oxygen atoms

Answer

Explanation:

Step1: Recall Avogadro's number

1 mole of any substance contains Avogadro's number ($N_A = 6.022\times 10^{23}$) of particles (molecules in this case).

Step2: Analyze each option

  • Mass: Molar - mass of $O_2$ is $32\ g/mol$ and of $CO$ is $28\ g/mol$, so mass is different.
  • Volume: Volume of a gas depends on temperature and pressure (using $PV = nRT$). Without same $T$ and $P$, volume may not be the same.
  • Number of molecules: Since both are 1 - mole substances, the number of molecules in 1 mole of $O_2$ and 1 mole of $CO$ is the same, which is $N_A$.
  • Number of oxygen atoms: 1 mole of $O_2$ has 2 moles of oxygen atoms and 1 mole of $CO$ has 1 mole of oxygen atoms.

Answer:

the number of molecules