Bài 25: Kim loại kiềm và hợp chất quan trọng của kim loại kiềm
Hướng dẫn giải Bài 3 (Trang 111 SGK Hóa học 12)
<p>Nồng độ phần trăm của dung dịch tạo th&agrave;nh khi h&ograve;a tan 39 gam kali kim loại v&agrave;o 362 gam nước l&agrave; kết quả n&agrave;o sau đ&acirc;y ?</p> <p>A. 15,47%<span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span>B. 13.97%<span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span>C. 14%<span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span>D. 14,04%</p> <p><span style="text-decoration: underline;"><strong>Hướng dẫn giải</strong></span></p> <p>Chọn C. &nbsp; <span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><math xmlns="http://www.w3.org/1998/Math/MathML"><mn>2</mn><mi>K</mi><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mn>2</mn><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi><mo>&#8594;</mo><mo>&#160;</mo><mn>2</mn><mi>K</mi><mi>O</mi><mi>H</mi><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><msub><mi>H</mi><mn>2</mn></msub><mo>&#8593;</mo></math></p> <p><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><math xmlns="http://www.w3.org/1998/Math/MathML"><mfrac><mn>39</mn><mn>39</mn></mfrac><mo>=</mo><mn>1</mn></math><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><math xmlns="http://www.w3.org/1998/Math/MathML"><mo>&#8594;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mn>1</mn><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#8594;</mo><mo>&#160;</mo><mo>&#160;</mo><mn>0</mn><mo>,</mo><mn>5</mn></math></p> <p><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>m</mi><mrow><mi>C</mi><mi>l</mi></mrow></msub><mo>=</mo><msub><mi>m</mi><mrow><mi>K</mi><mi>O</mi><mi>H</mi></mrow></msub><mo>=</mo><mn>1</mn><mo>.</mo><mn>56</mn><mo>=</mo><mn>56</mn><mo>&#160;</mo><mfenced><mi>g</mi></mfenced></math></p> <p><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>m</mi><mrow><mi>d</mi><mi>u</mi><mi>n</mi><mi>g</mi><mo>&#160;</mo><mi>d</mi><mi>&#7883;</mi><mi>c</mi><mi>h</mi></mrow></msub><mo>=</mo><msub><mi>m</mi><mi>K</mi></msub><mo>+</mo><msub><mi>m</mi><mrow><msub><mi>H</mi><mn>2</mn></msub><mi>O</mi></mrow></msub><mo>&#160;</mo><mo>-</mo><mo>&#160;</mo><msub><mi>m</mi><msub><mi>H</mi><mn>2</mn></msub></msub><mo>=</mo><mn>39</mn><mo>&#160;</mo><mo>+</mo><mo>&#160;</mo><mn>362</mn><mo>&#160;</mo><mo>-</mo><mn>2</mn><mo>.</mo><mn>0</mn><mo>,</mo><mn>5</mn><mo>&#160;</mo><mo>=</mo><mn>400</mn><mo>&#160;</mo><mfenced><mi>g</mi></mfenced></math></p> <p>Nồng độ phần trăm của dung dịch KOH :&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>C</mi><msub><mo>%</mo><mrow><mi>K</mi><mi>O</mi><mi>H</mi></mrow></msub><mo>=</mo><mfrac><mn>56</mn><mn>400</mn></mfrac><mo>.</mo><mn>100</mn><mo>%</mo><mo>=</mo><mn>14</mn><mfenced><mo>%</mo></mfenced></math></p>
Giải bài tập 3 ( trang 111, SGK Hóa học 12 )
GV: GV colearn
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Giải bài tập 3 ( trang 111, SGK Hóa học 12 )
GV: GV colearn