Cho m gam hỗn hợp gồm <span class="MathJax_Preview" style="color: inherit;"><span class="MJXp-math" id="MJXp-Span-1"><span class="MJXp-mstyle" id="MJXp-Span-2"><span class="MJXp-mrow" id="MJXp-Span-3"><span class="MJXp-mi MJXp-italic" id="MJXp-Span-4">F</span><span class="MJXp-mi MJXp-italic" id="MJXp-Span-5">e</span><span class="MJXp-mi MJXp-italic" id="MJXp-Span-6">O</span></span><span class="MJXp-mo" id="MJXp-Span-7" style="margin-left: 0em; margin-right: 0.222em;">,</span><span class="MJXp-mrow" id="MJXp-Span-8"><span class="MJXp-mi MJXp-italic" id="MJXp-Span-9">C</span><span class="MJXp-mi MJXp-italic" id="MJXp-Span-10">u</span><span class="MJXp-mi MJXp-italic" id="MJXp-Span-11">O</span></span><span class="MJXp-mo" id="MJXp-Span-12" style="margin-left: 0em; margin-right: 0.222em;">,</span><span class="MJXp-msubsup" id="MJXp-Span-13"><span class="MJXp-mrow" id="MJXp-Span-14" style="margin-right: 0.05em;"><span class="MJXp-mi MJXp-italic" id="MJXp-Span-15">F</span><span class="MJXp-mi MJXp-italic" id="MJXp-Span-16">e</span></span><span class="MJXp-mrow MJXp-script" id="MJXp-Span-17" style="vertical-align: -0.4em;"><span class="MJXp-mn" id="MJXp-Span-18">3</span></span></span><span class="MJXp-msubsup" id="MJXp-Span-19"><span class="MJXp-mrow" id="MJXp-Span-20" style="margin-right: 0.05em;"><span class="MJXp-mi MJXp-italic" id="MJXp-Span-21">O</span></span><span class="MJXp-mrow MJXp-script" id="MJXp-Span-22" style="vertical-align: -0.4em;"><span class="MJXp-mn" id="MJXp-Span-23">4</span></span></span></span></span></span><span id="MathJax-Element-1-Frame" class="mjx-chtml MathJax_CHTML MJXc-processed" tabindex="0" style="font-size: 127%;"><span id="MJXc-Node-1" class="mjx-math"><span id="MJXc-Node-2" class="mjx-mrow"><span id="MJXc-Node-3" class="mjx-mstyle"><span id="MJXc-Node-4" class="mjx-mrow" style="font-size: 144%;"><span id="MJXc-Node-5" class="mjx-texatom"><span id="MJXc-Node-6" class="mjx-mrow"><span id="MJXc-Node-7" class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.445em; padding-bottom: 0.298em; padding-right: 0.106em;">F</span></span><span id="MJXc-Node-8" class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.199em; padding-bottom: 0.298em;">e</span></span><span id="MJXc-Node-9" class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.495em; padding-bottom: 0.298em;">O</span></span></span></span><span id="MJXc-Node-10" class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R" style="margin-top: -0.145em; padding-bottom: 0.544em;">,</span></span><span id="MJXc-Node-11" class="mjx-texatom MJXc-space1"><span id="MJXc-Node-12" class="mjx-mrow"><span id="MJXc-Node-13" class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.495em; padding-bottom: 0.298em; padding-right: 0.045em;">C</span></span><span id="MJXc-Node-14" class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.199em; padding-bottom: 0.298em;">u</span></span><span id="MJXc-Node-15" class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.495em; padding-bottom: 0.298em;">O</span></span></span></span><span id="MJXc-Node-16" class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R" style="margin-top: -0.145em; padding-bottom: 0.544em;">,</span></span><span id="MJXc-Node-17" class="mjx-msubsup MJXc-space1"><span class="mjx-base"><span id="MJXc-Node-18" class="mjx-texatom"><span id="MJXc-Node-19" class="mjx-mrow"><span id="MJXc-Node-20" class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.445em; padding-bottom: 0.298em; padding-right: 0.106em;">F</span></span><span id="MJXc-Node-21" class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.199em; padding-bottom: 0.298em;">e</span></span></span></span></span><span class="mjx-sub" style="font-size: 70.7%; vertical-align: -0.212em; padding-right: 0.071em;"><span id="MJXc-Node-22" class="mjx-texatom" style=""><span id="MJXc-Node-23" class="mjx-mrow"><span id="MJXc-Node-24" class="mjx-mn"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.396em; padding-bottom: 0.347em;">3</span></span></span></span></span></span><span id="MJXc-Node-25" class="mjx-msubsup"><span class="mjx-base"><span id="MJXc-Node-26" class="mjx-texatom"><span id="MJXc-Node-27" class="mjx-mrow"><span id="MJXc-Node-28" class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.495em; padding-bottom: 0.298em;">O</span></span></span></span></span><span class="mjx-sub" style="font-size: 70.7%; vertical-align: -0.212em; padding-right: 0.071em;"><span id="MJXc-Node-29" class="mjx-texatom" style=""><span id="MJXc-Node-30" class="mjx-mrow"><span id="MJXc-Node-31" class="mjx-mn"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.396em; padding-bottom: 0.347em;">4</span></span></span></span></span></span></span></span></span></span></span><script type="math/tex" id="MathJax-Element-1">\Large{FeO}, {CuO}, {Fe}_{3} {O}_{4}</script> (có số mo

Cho m gam hỗn hợp gồm $\Large{FeO}, {CuO}, {Fe}_{3} {O}_{4}$ (có số mo

4.3/5

Tác giả: Thầy Tùng

Đăng ngày: 18 Aug 2022

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Lời giải chi tiết

Câu hỏi:

Cho m gam hỗn hợp gồm $\Large{FeO}, {CuO}, {Fe}_{3} {O}_{4}$ (có số mol bằng nhau) tác dụng hết với dung dịch $\Large{HNO}_{3}$ thu được hỗn hợp khí gồm 0,09 mol $\Large {NO}_{2}$ và 0,05 mol $\Large {NO}$ . Giá trị của m là

A. 36,48.
B. 18,24.
C. 46,08.
D. 37,44.

Đáp án án đúng là: C

Lời giải chi tiết:

Gọi số mol mỗi chất trong hỗn hợp là x

$\Large{n}_{{e}_{cho}}={n}_{{FeO}}+{n}_{{Fe}_{3} {O}_{4}}=2 {x}$

$\Large{n}_{{e}_{{nhận}}}={n}_{{NO}_{2}}+3 {n}_{{NO}}=0,24$ mol

Vì $\Large{n}_{{e} \text { cho }}={n}_{\text {e nhận }} \Rightarrow x = 0,12$

$\Large\Rightarrow m=m_{FeO}+m_{CuO}+m_{Fe_3O_4}=46,08$ gam

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