Cho 17,82 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-mi MJXp-italic" id="MJXp-Span-3">N</span><span class="MJXp-mi MJXp-italic" id="MJXp-Span-4">a</span><span class="MJXp-mo" id="MJXp-Span-5" style="margin-left: 0em; margin-right: 0.222em;">,</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-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.445em; padding-bottom: 0.298em; padding-right: 0.085em;">N</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: 0.298em;">a</span></span><span id="MJXc-Node-7" class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R" style="margin-top: -0.145em; padding-bottom: 0.544em;">,</span></span></span></span></span></span></span><script type="math/tex" id="MathJax-Element-1">\Large Na,</script> <span class="MathJax_Preview" style="color: inherit;"><span class="MJXp-math" id="MJXp-Span-6"><span class="MJXp-mstyle" id="MJXp-Span-7"><span class="MJXp-mi MJXp-italic" id="MJXp-Span-8">N</span><span class="MJXp-msubsup" id="MJXp-Span-9"><span class="MJXp-mi MJXp-italic" id="MJXp-Span-10" style="margin-right: 0.05em;">a</span><span class="MJXp-mn MJXp-script" id="MJXp-Span-11" style="vertical-align: -0.4em;">2</span></span><span class="MJXp-mi MJXp-italic" id="MJXp-Span-12">O</span><span class="MJXp-mo" id="MJXp-Span-13" style="margin-left: 0em; margin-right: 0.222em;">,</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-8" class="mjx-math"><span id="MJXc-Node-9" class="mjx-mrow"><span id="MJXc-Node-10" class="mjx-mstyle"><span id="MJXc-Node-11" class="mjx-mrow" style="font-size: 144%;"><span id="MJXc-Node-12" class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.445em; padding-bottom: 0.298em; padding-right: 0.085em;">N</span></span><span id="MJXc-Node-13" class="mjx-msubsup"><span class="mjx-base"><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;">a</span></span></span><span class="mjx-sub" style="font-size: 70.7%; vertical-align: -0.212em; padding-right: 0.071em;"><span id="MJXc-Node-15" class="mjx-mn" style=""><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.396em; padding-bottom: 0.347em;">2</span></span></span></span><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 id="MJXc-Node-17" class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R" style="margin-top: -0.145em; padding-bottom: 0.544em;">,</span></span></span></span></span></span></span><script type="math/tex" id="MathJax-Element-2">\Large Na_2O,</script> <span class="MathJax_Preview" style="color: inherit;"><span class="MJXp-math" id="MJXp-Span-14"><span class="MJXp-mstyle" id="MJXp-Span-15"><span class="MJXp-mi MJXp-italic" id="MJXp-Span-16">B</span><span class="MJXp-mi MJXp-italic" id="MJXp-Span-17">a</span><span class="MJXp-mo" id="MJXp-Span-18" style="margin-left: 0em; margin-right: 0.222em;">,</span></span></span></span><span id="MathJax-Element-3-Frame" class="mjx-chtml MathJax_CHTML MJXc-processed" tabindex="0" style="font-size: 127%;"><span id="MJXc-Node-18" class="mjx-math"><span id="MJXc-Node-19" class="mjx-mrow"><span id="MJXc-Node-20" class="mjx-mstyle"><span id="MJXc-Node-21" class="mjx-mrow" style="font-size: 144%;"><span id="MJXc-Node-22" class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.445em; padding-bottom: 0.298em;">B</span></span><span id="MJXc-Node-23" class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.199em; padding-bottom: 0.298em;">a</span></span><span id="MJXc-Node-24" class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R" style="margin-top: -0.145em; padding-bottom: 0.544em;">,</span></span></span></span></span></span></span><script type="math/tex" id="MathJax-Element-3">\Large Ba,</script> $\

Cho 17,82 gam hỗn hợp gồm Na,Na, Na2O,Na2O, Ba,Ba, $\

4.9/5

Tác giả: Thầy Tùng

Đăng ngày: 18 Aug 2022

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Câu hỏi:

Cho 17,82 gam hỗn hợp gồm Na,Na, Na2O,Na2O, Ba,Ba, BaOBaO (trong đó oxi chiếm 12,57% về khối lượng) vào nước, thu được a mol khí H2H2 và dung dịch X. Cho dung dịch CuSO4CuSO4 dư vào X, thu được 35,54 gam kết tủa. Giá trị của a là

Đáp án án đúng là: A

Lời giải chi tiết:

{Na:xBa:y+H2OO:0,14 |H2:a{Ba(OH)2NaOH  +CuSO4{BaSO4:yCu(OH)2:0,5(x+2y)

BTĐT dung dịch X: nOH=x+2y

Ta có hệ phương trình:

{23x+137y+0,14.16=17,82233y+98.0,5(x+2y)=35,54 

{x=0,32y=0,06

BTe: ne=x+2y=0,14.2+2a

a=0,08 mol