iran-konkur 2023 Q141

iran-konkur · Other · konkur-riazi_1402_tir_specialized Not Maths
141.12 grams of chromium(III) sulfate, what percentage yield does this reaction produce?
($\text{N}{\blacksquare}14$, $\text{O}{\blacksquare}16$, $\text{Na}{\blacksquare}23$, $\text{S}{\blacksquare}32$, $\text{Cr}{\blacksquare}52$ : $\text{g.mol}^{-1}$)
$$\text{H}_2\text{SO}_4(aq) + \text{K}_2\text{CrO}_4(aq) + \text{NaNO}_2(aq) \longrightarrow \text{Cr}(\text{SO}_4)_2(aq) + \text{K}_2\text{SO}_4(aq) + \text{NaNO}_3(aq) + \text{H}_2\text{O}(l)$$
(1) $90, 21$ (2) $75, 21$ (3) $90, 19$ (4) $75, 19$
\textbf{141.12} grams of chromium(III) sulfate, what percentage yield does this reaction produce?

($\text{N}{\blacksquare}14$, $\text{O}{\blacksquare}16$, $\text{Na}{\blacksquare}23$, $\text{S}{\blacksquare}32$, $\text{Cr}{\blacksquare}52$ : $\text{g.mol}^{-1}$)

$$\text{H}_2\text{SO}_4(aq) + \text{K}_2\text{CrO}_4(aq) + \text{NaNO}_2(aq) \longrightarrow \text{Cr}(\text{SO}_4)_2(aq) + \text{K}_2\text{SO}_4(aq) + \text{NaNO}_3(aq) + \text{H}_2\text{O}(l)$$

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(1) $90, 21$ \hspace{1cm} (2) $75, 21$ \hspace{1cm} (3) $90, 19$ \hspace{1cm} (4) $75, 19$
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