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

Brief Explanations:

One mole of any substance contains Avogadro's number ($6.022\times 10^{23}$) of entities (molecules in this case). Mass depends on molar - mass which is different for $O_2$ and $CO$. Volume depends on temperature and pressure (not specified as same here). $O_2$ has 2 oxygen atoms per molecule and $CO$ has 1 oxygen atom per molecule.

Answer:

C. the number of molecules