<p>Укажіть формулу речовини <mjx-container class="MathJax CtxtMenu_Attached_0" jax="SVG" tabindex="0" ctxtmenu_counter="275" style="position: relative;"><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mrow data-mjx-texclass="ORD"><mi mathvariant="normal">Y</mi></mrow></math></mjx-assistive-mml></mjx-container> у схемі перетворень</p>

<math xmlns="http://www.w3.org/1998/Math/MathML" display="block"><mrow data-mjx-texclass="ORD"><msub><mi data-mjx-auto-op="false">CH</mi><mn>3</mn></msub><msub><mi data-mjx-auto-op="false">COOCH</mi><mn>3</mn></msub><mover><mstyle scriptlevel="0"><mo data-mjx-texclass="REL">→</mo></mstyle><mpadded width="+0.833em" lspace="0.278em" voffset="-.2em" height="-.2em"><mo>+</mo><msub><mi mathvariant="normal">H</mi><mn>2</mn></msub><mi mathvariant="normal">O</mi><mo>,</mo><mtext>&nbsp;</mtext><msup><mi data-mjx-auto-op="false">OH</mi><mo>−</mo></msup><mspace depth=".25em"></mspace></mpadded></mover><mi mathvariant="normal">X</mi><mover><mstyle scriptlevel="0"><mo data-mjx-texclass="REL">→</mo></mstyle><mpadded width="+0.833em" lspace="0.278em" voffset="-.2em" height="-.2em"><mo>+</mo><mi data-mjx-auto-op="false">CuO</mi><mo>,</mo><mtext>&nbsp;</mtext><msup><mi mathvariant="normal">t</mi><mo>∘</mo></msup><mspace depth=".25em"></mspace></mpadded></mover><mi mathvariant="normal">Y</mi><mover><mstyle scriptlevel="0"><mo data-mjx-texclass="REL">→</mo></mstyle><mpadded width="+0.833em" lspace="0.278em" voffset="-.2em" height="-.2em"><mo>+</mo><mi data-mjx-auto-op="false">Cu</mi><mo stretchy="false">(</mo><mi data-mjx-auto-op="false">OH</mi><msub><mo stretchy="false">)</mo><mn>2</mn></msub><mo>,</mo><mtext>&nbsp;</mtext><msup><mi mathvariant="normal">t</mi><mo>∘</mo></msup><mspace depth=".25em"></mspace></mpadded></mover><mi data-mjx-auto-op="false">HCOOH</mi><mo>.</mo></mrow></math>

<math xmlns="http://www.w3.org/1998/Math/MathML"><mrow data-mjx-texclass="ORD"><msub><mi data-mjx-auto-op="false">HCOOCH</mi><mn>3</mn></msub></mrow></math>

Питання 19