Xà phòng hóa hoàn toàn 2,96 gam <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">H</span><span class="MJXp-mi MJXp-italic" id="MJXp-Span-4">C</span><span class="MJXp-mi MJXp-italic" id="MJXp-Span-5">O</span><span class="MJXp-mi MJXp-italic" id="MJXp-Span-6">O</span><span class="MJXp-mrow" id="MJXp-Span-7"><span class="MJXp-msubsup" id="MJXp-Span-8"><span class="MJXp-mrow" id="MJXp-Span-9" style="margin-right: 0.05em;"><span class="MJXp-mi MJXp-italic" id="MJXp-Span-10">C</span></span><span class="MJXp-mrow MJXp-script" id="MJXp-Span-11" style="vertical-align: -0.4em;"><span class="MJXp-mn" id="MJXp-Span-12">2</span></span></span></span><span class="MJXp-mrow" id="MJXp-Span-13"><span class="MJXp-msubsup" id="MJXp-Span-14"><span class="MJXp-mrow" id="MJXp-Span-15" style="margin-right: 0.05em;"><span class="MJXp-mi MJXp-italic" id="MJXp-Span-16">H</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">5</span></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-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.445em; padding-bottom: 0.298em; padding-right: 0.057em;">H</span></span><span id="MJXc-Node-6" 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-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-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-9" class="mjx-texatom"><span id="MJXc-Node-10" class="mjx-mrow"><span id="MJXc-Node-11" class="mjx-msubsup"><span class="mjx-base" style="margin-right: -0.045em;"><span id="MJXc-Node-12" class="mjx-texatom"><span id="MJXc-Node-13" class="mjx-mrow"><span id="MJXc-Node-14" 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></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-texatom" style=""><span id="MJXc-Node-16" class="mjx-mrow"><span id="MJXc-Node-17" 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 id="MJXc-Node-18" class="mjx-texatom"><span id="MJXc-Node-19" class="mjx-mrow"><span id="MJXc-Node-20" class="mjx-msubsup"><span class="mjx-base" style="margin-right: -0.057em;"><span id="MJXc-Node-21" class="mjx-texatom"><span id="MJXc-Node-22" class="mjx-mrow"><span id="MJXc-Node-23" class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.445em; padding-bottom: 0.298em; padding-right: 0.057em;">H</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-24" class="mjx-texatom" style=""><span id="MJXc-Node-25" class="mjx-mrow"><span id="MJXc-Node-26" class="mjx-mn"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.396em; padding-bottom: 0.347em;">5</span></span></span></span></span></span></span></span></span></span></span></span></span><script type="math/tex" id="MathJax-Element-1">\Large HCOO{{C}_{2}}{{H}_{5}}</script> bằng m

Xà phòng hóa hoàn toàn 2,96 gam $\Large HCOO{{C}_{2}}{{H}_{5}}$ bằng m

4.8/5

Tác giả: Thầy Tùng

Đăng ngày: 18 Aug 2022

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Lời giải chi tiết

Câu hỏi:

Xà phòng hóa hoàn toàn 2,96 gam $\Large HCOO{{C}_{2}}{{H}_{5}}$ bằng một lượng dung dịch $\Large KOH$ đun nóng vừa đủ. Cô cạn dung dịch sau phản ứng, thu được m gam muối khan. Giá trị của m là:

A. A. 3,36
B. B. 2,72
C. C. 5,20
D. D. 4,48

Đáp án án đúng là: A

Lời giải chi tiết:

$\Large {{n}_{este}}=0,04\left( mol \right)$

$\Large \Rightarrow {{n}_{HCOOK}}=0,04\left( mol \right)$

$\Large \Rightarrow m = 0,04.84 = 3,36\left( g \right)$

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