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		<h1>Hướng dẫn giải bài tập SGK Hoá học lớp 12 bài 3&#x3A; Khái niệm về xà phòng và chất giặt rửa tổng hợp</h1>
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			Hướng dẫn giải bài tập SGK Hoá học lớp 12 bài 3: Khái niệm về xà phòng và chất giặt rửa tổng hợp
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			<p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;"><strong style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">Bài 1 (trang 15 SGK Hóa 12): Xà phòng là gì?</strong></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;"><u><em><strong>Giải:</strong></em></u></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">Xà phòng là hỗn hợp muối natri hoặc muối kali của axit béo có thêm một số chất phụ gia.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;"><strong style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">Bài 2 (trang 15 SGK Hóa 12): Ghi Đ (đúng ) hoặc S (sai ) vào ô trống bên cạnh các câu sau:</strong></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">a) Xà phòng là sản phẩm của phản ứng xà phòng hóa.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">b) Muối natri hoặc kali của axit hữu cơ là thành phần chính của xà phòng.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">c) Khi đun nóng chất béo với dung dịch NaOH hoặc KOH ta được xà phòng.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">d) Từ dầu mỏ có thể sản xuất được chất giặt tổng hợp.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;"><u style="color: rgba(0, 0, 0, 0.87); font-family: Arial, Helvetica, sans-serif; font-size: 16px; text-align: justify;"><em><strong>Giải:</strong></em></u></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">a. Đ</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">b. S. Câu đúng phải là “muối natri hoặc kali của axit béo là thành phần chính của xà phòng”.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">c. Đ</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">d. Đ</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;"><strong style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">Bài 3 (trang 15 SGK Hóa 12): Một loại mỡ động vật chứ 20% tristearoylglixerol m, 30% tripanmitoylgrixerol và 50 % trioleoylgixerol (về khối lượng)</strong></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">a) Viết phương trình hóa học của các phản ứng xảy ra khi thực hiện phản ứng xà phòng hóa loại mỡ trên.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">b) Tính khối lượng muối thu được khi xà phòng hóa 1 tấn mỡ trên bằng dung dịch NaOH, giả sử hiệu suất của quá trình đạt 90%.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;"><u style="color: rgba(0, 0, 0, 0.87); font-family: Arial, Helvetica, sans-serif; font-size: 16px; text-align: justify;"><em><strong>Giải:</strong></em></u></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">Trong 1 tấn mỡ có 0,2 tấn (C<sub style="margin: 0px; padding: 0px; border: 0px; font: inherit;">17</sub>H<sub style="margin: 0px; padding: 0px; border: 0px; font: inherit;">35</sub>COO)<sub style="margin: 0px; padding: 0px; border: 0px; font: inherit;">3</sub>C<sub style="margin: 0px; padding: 0px; border: 0px; font: inherit;">3</sub>H<sub style="margin: 0px; padding: 0px; border: 0px; font: inherit;">5</sub></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">0,3 tấn (C<sub style="margin: 0px; padding: 0px; border: 0px; font: inherit;">15</sub>H<sub style="margin: 0px; padding: 0px; border: 0px; font: inherit;">31</sub>COO)<sub style="margin: 0px; padding: 0px; border: 0px; font: inherit;">3</sub>C<sub style="margin: 0px; padding: 0px; border: 0px; font: inherit;">3</sub>H<sub style="margin: 0px; padding: 0px; border: 0px; font: inherit;">5</sub></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">0,5 tấn (C<sub style="margin: 0px; padding: 0px; border: 0px; font: inherit;">17</sub>H<sub style="margin: 0px; padding: 0px; border: 0px; font: inherit;">33</sub>COO)<sub style="margin: 0px; padding: 0px; border: 0px; font: inherit;">3</sub>C<sub style="margin: 0px; padding: 0px; border: 0px; font: inherit;">3</sub>H<sub style="margin: 0px; padding: 0px; border: 0px; font: inherit;">5</sub></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">Giả sử có 1 kmol (C<sub style="margin: 0px; padding: 0px; border: 0px; font: inherit;">17</sub>H<sub style="margin: 0px; padding: 0px; border: 0px; font: inherit;">35</sub>COO)<sub style="margin: 0px; padding: 0px; border: 0px; font: inherit;">3</sub>C<sub style="margin: 0px; padding: 0px; border: 0px; font: inherit;">3</sub>H<sub style="margin: 0px; padding: 0px; border: 0px; font: inherit;">5</sub></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">1 kmol (C<sub style="margin: 0px; padding: 0px; border: 0px; font: inherit;">15</sub>H<sub style="margin: 0px; padding: 0px; border: 0px; font: inherit;">31</sub>COO)<sub style="margin: 0px; padding: 0px; border: 0px; font: inherit;">3</sub>C<sub style="margin: 0px; padding: 0px; border: 0px; font: inherit;">3</sub>H<sub style="margin: 0px; padding: 0px; border: 0px; font: inherit;">5</sub></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">1 kmol (C<sub style="margin: 0px; padding: 0px; border: 0px; font: inherit;">17</sub>H<sub style="margin: 0px; padding: 0px; border: 0px; font: inherit;">33</sub>COO)<sub style="margin: 0px; padding: 0px; border: 0px; font: inherit;">3</sub>C<sub style="margin: 0px; padding: 0px; border: 0px; font: inherit;">3</sub>H<sub style="margin: 0px; padding: 0px; border: 0px; font: inherit;">5</sub></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">Phương trình hóa học</p><h2 id="mcetoc_1c6432c450" style="margin: 0px; padding: 16px 0px 8px; border: 0px; font-variant-numeric: inherit; font-weight: inherit; font-stretch: inherit; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgb(0, 51, 153);"><strong style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;"><img alt="Khái niệm về xà phòng và chất giặt rửa tổng hợp" class="lightbox" data-i="0" height="324" src="https://sachgiai.com/uploads/news/2018_06/giai-bai-tap-hoa-hoc-12-bai-3-khai-niem-ve-xa-phong-va-chat-giat-rua-tong-hop-1.jpg" style="margin: 0px; padding: 0px; border: 0px; font: inherit; cursor: zoom-in; height: auto; max-width: 100%;" width="561" /></strong></h2><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">Theo pt (1) , (2), (3) khối lượng muối thu được là :</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;"><img alt="Khái niệm về xà phòng và chất giặt rửa tổng hợp" class="lightbox" data-i="1" height="49" src="https://sachgiai.com/uploads/news/2018_06/giai-bai-tap-hoa-hoc-12-bai-3-khai-niem-ve-xa-phong-va-chat-giat-rua-tong-hop-2.jpg" style="margin: 0px; padding: 0px; border: 0px; font: inherit; cursor: zoom-in; height: auto; max-width: 100%;" width="444" /></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">Vì hiệu suất là 90% nên khối lượng muối thu được là:</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;"><img alt="Khái niệm về xà phòng và chất giặt rửa tổng hợp" class="lightbox" data-i="2" height="42" src="https://sachgiai.com/uploads/news/2018_06/giai-bai-tap-hoa-hoc-12-bai-3-khai-niem-ve-xa-phong-va-chat-giat-rua-tong-hop-3.jpg" style="margin: 0px; padding: 0px; border: 0px; font: inherit; cursor: zoom-in; height: auto; max-width: 100%;" width="226" /></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;"><strong style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">Bài 4 (trang 16 SGK Hóa 12): Nêu những ưu điểm và hạn chế của việc dùng xà phòng so với dùng hóa chất giặt rửa tổng hợp.</strong></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;"><u style="color: rgba(0, 0, 0, 0.87); font-family: Arial, Helvetica, sans-serif; font-size: 16px; text-align: justify;"><em><strong>Giải:</strong></em></u></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">- Ưu điểm: xà phòng có chứa axit béo vi sinh vật phân hủy do đó không gây ô nhiễm môi trường. Trong khi đó các chất giặt rửa tổng hợp có thể gây ô nhiễm môi trường.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">- Nhược điểm: Các muối panmitat hay stearat của các kim loại hóa trị II của xà phòng thường khó tan trong nước, do đó xà phòng không dùng để giặt rửa được trong nước cứng.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;"><strong style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">Bài 5 (trang 16 SGK Hóa 12): Cần bao nhiêu kg chất béo chứa 89% khối lượng tristearin (còn 11% tạp chất trơ bị loại bỏ trong quá trình nấu xà phòng) để sản xuất được 1 tấn xà phòng 72 (xà phòng chứa 72 % khối lượng natri stearat).</strong></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;"><u style="color: rgba(0, 0, 0, 0.87); font-family: Arial, Helvetica, sans-serif; font-size: 16px; text-align: justify;"><em><strong>Giải:</strong></em></u></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">Khối lượng của natri stearat là:</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">m<sub style="margin: 0px; padding: 0px; border: 0px; font: inherit;"><img alt="C_{17}H_{35}COONa" class="data-latex" data-i="3" data-latex="C_{17}H_{35}COONa" height="18" src="https://sachgiai.com/uploads/news/2018_06/chart_1.png" style="margin: 0px; padding: 0px; border: 0px; font: inherit; height: auto; max-width: 100%;" width="121" /></sub>&nbsp;= 1.72/100 (tấn)</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">n<img alt="C_{17}H_{35}COONa" class="data-latex" data-i="3" data-latex="C_{17}H_{35}COONa" height="18" src="https://sachgiai.com/uploads/news/2018_06/chart_1.png" style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit; height: auto; max-width: 100%;" width="121" />&nbsp;= 0,72 /306 mol.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">PTHH (C<sub style="margin: 0px; padding: 0px; border: 0px; font: inherit;">17</sub>H<sub style="margin: 0px; padding: 0px; border: 0px; font: inherit;">35</sub>COO)<sub style="margin: 0px; padding: 0px; border: 0px; font: inherit;">3</sub>C<sub style="margin: 0px; padding: 0px; border: 0px; font: inherit;">3</sub>H<sub style="margin: 0px; padding: 0px; border: 0px; font: inherit;">5</sub>&nbsp;+ 3NaOH → 3C<sub style="margin: 0px; padding: 0px; border: 0px; font: inherit;">17</sub>H<sub style="margin: 0px; padding: 0px; border: 0px; font: inherit;">35</sub>COONa + C<sub style="margin: 0px; padding: 0px; border: 0px; font: inherit;">3</sub>H<sub style="margin: 0px; padding: 0px; border: 0px; font: inherit;">5</sub>(OH)<sub style="margin: 0px; padding: 0px; border: 0px; font: inherit;">3</sub></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">n<img alt="(C_{17}H_{35}COO)_3C_3H_5" class="data-latex" data-i="5" data-latex="(C_{17}H_{35}COO)_3C_3H_5" height="23" src="https://sachgiai.com/uploads/news/2018_06/chart-1.png" style="margin: 0px; padding: 0px; border: 0px; font: inherit; height: auto; max-width: 100%;" width="167" />&nbsp;= 0,72 / 3 x 306.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">m<img alt="(C_{17}H_{35}COO)_3C_3H_5" class="data-latex" data-i="5" data-latex="(C_{17}H_{35}COO)_3C_3H_5" height="23" src="https://sachgiai.com/uploads/news/2018_06/chart-1.png" style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit; height: auto; max-width: 100%;" width="167" />&nbsp;= (890.0,72)/(3.306) = 0,698 (kg)</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">Khối lương chất béo là:</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">m= 0,698.100/89 = 0,784 (kg)&nbsp;</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: center;">--------</p>
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