221. Which option is correct? $(H = 1,\ C = 12,\ O = 16\ :\ \text{g.mol}^{-1})$
Alkaline earth metal carbonates, like alkali metal carbonates, dissolve in water.
A mixture of water and barium sulfate and acetone has two common phases.
The molar mass difference between phenol and toluene equals the molar mass difference between methanol and ethanol.
The solubility of ethanol in nonpolar solvents is greater than that of hexanol in those solvents.
\textbf{221.} Which option is correct? $(H = 1,\ C = 12,\ O = 16\ :\ \text{g.mol}^{-1})$
\begin{enumerate}
\item Alkaline earth metal carbonates, like alkali metal carbonates, dissolve in water.
\item A mixture of water and barium sulfate and acetone has two common phases.
\item The molar mass difference between phenol and toluene equals the molar mass difference between methanol and ethanol.
\item The solubility of ethanol in nonpolar solvents is greater than that of hexanol in those solvents.
\end{enumerate}
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