Xà phòng hóa hoàn toàn 2,96 gam <span class="MathJax_Preview" style="color: inherit; display: none;"></span><span id="MathJax-Element-1-Frame" class="mjx-chtml MathJax_CHTML" tabindex="0" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mstyle mathsize="1.44em"><msub><mrow class="MJX-TeXAtom-ORD"><mi>H</mi><mi>C</mi><mi>O</mi><mi>O</mi><mi>C</mi></mrow><mrow class="MJX-TeXAtom-ORD"><mn>2</mn></mrow></msub><msub><mrow class="MJX-TeXAtom-ORD"><mi>H</mi></mrow><mrow class="MJX-TeXAtom-ORD"><mn>5</mn></mrow></msub></mstyle></math>" role="presentation" style="font-size: 127%; position: relative;"><span id="MJXc-Node-1" class="mjx-math" aria-hidden="true"><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-msubsup"><span class="mjx-base" style="margin-right: -0.045em;"><span id="MJXc-Node-6" class="mjx-texatom"><span id="MJXc-Node-7" class="mjx-mrow"><span id="MJXc-Node-8" 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-9" 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-10" 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-11" 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-12" 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-13" class="mjx-texatom" style=""><span id="MJXc-Node-14" class="mjx-mrow"><span id="MJXc-Node-15" 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-16" class="mjx-msubsup"><span class="mjx-base" style="margin-right: -0.057em;"><span id="MJXc-Node-17" class="mjx-texatom"><span id="MJXc-Node-18" class="mjx-mrow"><span id="MJXc-Node-19" 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-20" class="mjx-texatom" style=""><span id="MJXc-Node-21" class="mjx-mrow"><span id="MJXc-Node-22" 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 class="MJX_Assistive_MathML" role="presentation"><math xmlns="http://www.w3.org/1998/Math/MathML"><mstyle mathsize="1.44em"><msub><mrow class="MJX-TeXAtom-ORD"><mi>H</mi><mi>C</mi><mi>O</mi><mi>O</mi><mi>C</mi></mrow><mrow class="MJX-TeXAtom-ORD"><mn>2</mn></mrow></msub><msub><mrow class="MJX-TeXAtom-ORD"><mi>H</mi></mrow><mrow class="MJX-TeXAtom-ORD"><mn>5</mn></mrow></msub></mstyle></math></span></span><script type="math/tex" id="MathJax-Element-1">\Large{HCOOC}_{2} {H}_{5}</script> bằng một l

Xà phòng hóa hoàn toàn 2,96 gam $\Large{HCOOC}_{2} {H}_{5}$ bằng một l

4.7/5

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 $\Large{HCOOC}_{2} {H}_{5}$ bằng một lượng dung dịch $\Large{KOH}$ vừa đủ. Cô cạn dung dịch sau phản ứng, thu được m gam muối khan. Giá trị của m là

A. 2,52.
B. 3,36.
C. 2,57.
D. 4,20.

Đáp án án đúng là: B

Lời giải chi tiết:

$\Large n_{HCOOK}=n_{{HCOOC}_{2} {H}_{5}}=0,04$ mol

$\Large m_{HCOOK}=3,36$ gam

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