218-- Regarding the two given reactions, how many statements are correct? (The chemical equations are balanced.) $$\text{(I)}\ \text{C}_2\text{H}_5\text{OH}(\text{l}) + \text{O}_2(\text{g}) \rightarrow \text{CO}_2(\text{g}) + \text{H}_2\text{O}(\text{l})$$ $$\text{(II)}\ \text{Na}_2\text{CO}_3(\text{s}) + \text{HCl}(\text{aq}) \rightarrow \text{NaCl}(\text{aq}) + \text{CO}_2(\text{g}) + \text{H}_2\text{O}(\text{l})$$
According to reaction I, burning one mole of ethanol produces 44.8 liters of gas at STP.
In reaction II, if 7.5 mol of acid is used, 15 moles of water are produced, and the yield of reaction II is 90\%.
Per gram of carbon-containing reactant, the molar ratio of $\text{CO}_2$ in reaction I to reaction II is $4/6$.
In reaction II, if 100 grams of impure $\text{Na}_2\text{CO}_3$ is used, 1.5 mol of salt is formed, and the purity is 79.5\%.
$(H = 1,\ C = 12,\ O = 16,\ Na = 23\ :\ \text{g.mol}^{-1})$ 1) 1 2) 2 3) 3 4) 4 \fbox{Calculation Space} %% Page 22 121-AChemistryPage 21
\textbf{218--} Regarding the two given reactions, how many statements are correct? (The chemical equations are balanced.)
$$\text{(I)}\ \text{C}_2\text{H}_5\text{OH}(\text{l}) + \text{O}_2(\text{g}) \rightarrow \text{CO}_2(\text{g}) + \text{H}_2\text{O}(\text{l})$$
$$\text{(II)}\ \text{Na}_2\text{CO}_3(\text{s}) + \text{HCl}(\text{aq}) \rightarrow \text{NaCl}(\text{aq}) + \text{CO}_2(\text{g}) + \text{H}_2\text{O}(\text{l})$$
\begin{itemize}
\item According to reaction I, burning one mole of ethanol produces 44.8 liters of gas at STP.
\item In reaction II, if 7.5 mol of acid is used, 15 moles of water are produced, and the yield of reaction II is 90\%.
\item Per gram of carbon-containing reactant, the molar ratio of $\text{CO}_2$ in reaction I to reaction II is $4/6$.
\item In reaction II, if 100 grams of impure $\text{Na}_2\text{CO}_3$ is used, 1.5 mol of salt is formed, and the purity is 79.5\%.
\end{itemize}
$(H = 1,\ C = 12,\ O = 16,\ Na = 23\ :\ \text{g.mol}^{-1})$
\hspace{2cm} 1) 1 \hspace{2cm} 2) 2 \hspace{2cm} 3) 3 \hspace{2cm} 4) 4
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\fbox{\textbf{Calculation Space}}
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