216- If $\Delta H^\circ$ of combustion of methanol is $-700\ \mathrm{kJ.mol^{-1}}$, how many grams of it must be burned so that the released heat can bring 125 grams of water from $10^\circ\mathrm{C}$ to boiling at 1 atm pressure? $$\left(\mathrm{c_{(water)} = 4.2\ J.g^{-1}.{}^\circ C^{-1},\ O = 16,\ C = 12,\ H = 1 : g.mol^{-1}}\right)$$ (1) $2/16$ (2) $1/68$ (3) $2/52$ (4) $3/36$ \begin{flushright} Calculation Space \end{flushright} %% Page 35 Download Exam Questions from Riazisara.ir Chemistry120-CPage 18
\textbf{216-} If $\Delta H^\circ$ of combustion of methanol is $-700\ \mathrm{kJ.mol^{-1}}$, how many grams of it must be burned so that the released heat can bring 125 grams of water from $10^\circ\mathrm{C}$ to boiling at 1 atm pressure?
$$\left(\mathrm{c_{(water)} = 4.2\ J.g^{-1}.{}^\circ C^{-1},\ O = 16,\ C = 12,\ H = 1 : g.mol^{-1}}\right)$$
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(1) $2/16$ \qquad (2) $1/68$ \qquad (3) $2/52$ \qquad (4) $3/36$
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\textbf{Calculation Space}
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