Hỗn hợp A 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-mi MJXp-italic" id="MJXp-Span-3">M</span><span class="MJXp-mi MJXp-italic" id="MJXp-Span-4">g</span><span class="MJXp-mi MJXp-italic" id="MJXp-Span-5">O</span><span class="MJXp-mo" id="MJXp-Span-6" style="margin-left: 0em; margin-right: 0.222em;">,</span><span class="MJXp-mi MJXp-italic" id="MJXp-Span-7">F</span><span class="MJXp-msubsup" id="MJXp-Span-8"><span class="MJXp-mi MJXp-italic" id="MJXp-Span-9" style="margin-right: 0.05em;">e</span><span class="MJXp-mrow MJXp-script" id="MJXp-Span-10" style="vertical-align: -0.4em;"><span class="MJXp-mn" id="MJXp-Span-11">2</span></span></span><span class="MJXp-msubsup" id="MJXp-Span-12"><span class="MJXp-mi MJXp-italic" id="MJXp-Span-13" style="margin-right: 0.05em;">O</span><span class="MJXp-mrow MJXp-script" id="MJXp-Span-14" style="vertical-align: -0.4em;"><span class="MJXp-mn" id="MJXp-Span-15">3</span></span></span><span class="MJXp-mo" id="MJXp-Span-16" style="margin-left: 0em; margin-right: 0.222em;">,</span><span class="MJXp-mi MJXp-italic" id="MJXp-Span-17">F</span><span class="MJXp-mi MJXp-italic" id="MJXp-Span-18">e</span><span class="MJXp-mi MJXp-italic" id="MJXp-Span-19">S</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: 120%;"><span id="MJXc-Node-5" class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.445em; padding-bottom: 0.298em; padding-right: 0.081em;">M</span></span><span id="MJXc-Node-6" class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.199em; padding-bottom: 0.495em; padding-right: 0.003em;">g</span></span><span id="MJXc-Node-7" class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.495em; padding-bottom: 0.298em;">O</span></span><span id="MJXc-Node-8" 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-9" class="mjx-mi MJXc-space1"><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-10" class="mjx-msubsup"><span class="mjx-base"><span id="MJXc-Node-11" 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 class="mjx-sub" style="font-size: 70.7%; vertical-align: -0.212em; padding-right: 0.071em;"><span id="MJXc-Node-12" class="mjx-texatom" style=""><span id="MJXc-Node-13" class="mjx-mrow"><span id="MJXc-Node-14" class="mjx-mn"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.396em; padding-bottom: 0.347em;">2</span></span></span></span></span></span><span id="MJXc-Node-15" class="mjx-msubsup"><span class="mjx-base"><span id="MJXc-Node-16" 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 class="mjx-sub" style="font-size: 70.7%; vertical-align: -0.212em; padding-right: 0.071em;"><span id="MJXc-Node-17" class="mjx-texatom" style=""><span id="MJXc-Node-18" class="mjx-mrow"><span id="MJXc-Node-19" 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-20" 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-21" class="mjx-mi MJXc-space1"><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-22" 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-23" class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.495em; padding-bottom: 0.298em; padding-right: 0.032em;">S</span></span></span></span></span></span></span><script type="math/tex" id="MathJax-Element-1">\large MgO, Fe_{2}O_{3}, FeS</script> và <span class="MathJax_Preview" style="color: inherit;"><span class="MJXp-math" id="MJXp-Span-20"><span class="MJXp-mstyle" id="MJXp-Span-21"><span class="MJXp-mi MJXp-italic" id="MJXp-Span-22">F</span><span class="MJXp-mi MJXp-italic" id="MJXp-Span-23">e</span><span class="MJXp-msubsup" id="MJXp-Span-24"><span class="MJXp-mi MJXp-italic" id="MJXp-Span-25" style="margin-right: 0.05em;">S</span><span class="MJXp-mrow MJXp-script" id="MJXp-Span-26" style="vertical-align: -0.4em;"><span class="MJXp-mn" id="MJXp-Span-27">2</span></span></span></span></span></span><span id="MathJax-Element-2-Frame" class="mjx-chtml MathJax_CHTML MJXc-processed" tabindex="0" style="font-size: 127%;"><span id="MJXc-Node-24" class="mjx-math"><span id="MJXc-Node-25" class="mjx-mrow"><span id="MJXc-Node-26" class="mjx-mstyle"><span id="MJXc-Node-27" class="mjx-mrow" style="font-size: 120%;"><span id="MJXc-Node-28" 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-29" 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-30" class="mjx-msubsup"><span class="mjx-base" style="margin-right: -0.032em;"><span id="MJXc-Node-31" class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.495em; padding-bottom: 0.298em; padding-right: 0.032em;">S</span></span></span><span class="mjx-sub" style="font-size: 70.7%; vertical-align: -0.212em; padding-right: 0.071em;"><span id="MJXc-Node-32" class="mjx-texatom" style=""><span id="MJXc-Node-33" class="mjx-mrow"><span id="MJXc-Node-34" class="mjx-mn"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.396em; padding-bottom: 0.347em;">2</span></span></span></span></span></span></span></span></span></span></span><script type="math/tex" id="MathJax-Element-2">\large FeS_{2}</script>. Ngườ

Hỗn hợp A gồm MgO,Fe2O3,FeSMgO,Fe2O3,FeSFeS2FeS2. Ngườ

4.7/5

Tác giả: Thầy Tùng

Đăng ngày: 18 Aug 2022

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Câu hỏi:

Hỗn hợp A gồm MgO,Fe2O3,FeSMgO,Fe2O3,FeS và FeS2FeS2. Người ta hòa tan hoàn toàn m gam A trong H2SO4H2SO4 đặc nóng dư thu SO2SO2, dung dịch sau phản ứng chứa 155m67155m67 gam muối. Mặt khác hòa tan m gam A trên vào HNO3HNO3 đặc nóng dư thu 14,336 lít hỗn hợp khí gồm SO2SO2 và NO2NO2 có tổng khối lượng là 29,8 gam. Cô cạn dung dịch sau phản ứng thu 28,44 gam muối. Biết trong A khối lượng oxi là 10m6710m67 gam. Phần trăm FeSFeS trong A gần nhất

Đáp án án đúng là: C

Lời giải chi tiết:

A+HNO3:{nSO2+nNO2=0,64 64nSO2+46nNO2=29,8

{nSO2=0,02nNO2=0,62

Đặt số mol của FeS và FeS2 lần lượt là x, y.

BTe3(x+y)+6.(x+2y0,02)+4.0,02=0,62

9x+15y=2.0,02+0,62=0,66 (1)

BTKLmA=mKL+mO+mS=mKL+10m67+32.(x+2y)=m

mKL=57m6732.(x+2y)

mmuối(1)=mKL+mSO24(1)=57m6732.(x+2y)+96nSO24(1)=155m67

nSO24(1)=98m67+32.(x+2y)96=49m3216+x+2y3

nSO24(1)=nO(A)+3(x+y)2=10m67.16+3(x+y)2

5m536+3.(x+y)2=49m3216+x+2y3 (2)

mmuối(2)=mKL+mNO3+mSO24(2)

57m6732.(x+2y)+62nNO3+96nSO24(2)=28,44g

{nNO3+2nSO24(2)=2nSO24(1)nSO24(2)=x+2y0,02

nNO3+2.(x+2y0,02)=5m268+3.(x+y)

nNO3=5m268+xy+0,04

57m6732.(x+2y)+62.(5m268+xy+0,04)+96.(x+2y0,02)=28,44 (3)

Từ (1), (2), (3) suy ra {x=0,04y=0,02m=10,72

%mFeS=88.0,0410,72.100%=32,84%

Gần nhất với giá trị 33%