Question

19£®Ð¡Ã÷¶ÔÉúÐâ·ÏÌúƬÖÐÌúµÄº¬Á¿½øÐÐÁ˲ⶨ£®Ð¡Ã÷³ÆÈ¡33g·ÏÌúƬ·ÅÈëÌØÖÆÈÝÆ÷ÖУ¬»ºÂý¼ÓÈë39.2%µÄÏ¡ÁòËᣬֱµ½·´Ó¦ÍêÈ«£¨¼ÙÉè·ÏÌúƬֻÓÐFe¡¢Fe₂O₃ÓëÏ¡ÁòËá·´Ó¦£¬¶øÇÒÁòËáÏÈÓë±íÃæµÄÌúÐâ·¢Éú·´Ó¦£©£¬ÊµÑéÊý¾ÝÈçͼËùʾ£®
£¨1£©ÓëÌúÐâ·´Ó¦µÄH₂SO₄ÈÜÒºÖеÄÈÜÖÊÊÇ7.35¿Ë£¬·´Ó¦Íê³ÉºóÈÜÒºÖеÄÈÜÖÊÊÇFe₂£¨SO₄£©₃¡¢Fe₂SO₄£®£¨Ìѧʽ£©
£¨2£©·ÏÌúƬÖÐÌúµ¥ÖʵÄÖÊÁ¿·ÖÊýΪ¶àÉÙ£¿£¨ÒªÇóд³ö¼ÆËã¹ý³Ì£¬½á¹û±£Áôµ½0.10%£©
£¨3£©Î´ÉúÐâÇ°ÌúƬµÄÖÊÁ¿Îª¶àÉÙ¿Ë£¿£¨ÒªÇóд³ö¼ÆËã¹ý³Ì£¬½á¹û±£Áôµ½0.1£©

Answer 1

·ÖÎö ¸ù¾Ý·´Ó¦µÄ»¯Ñ§·½³Ìʽ½áºÏͼʾÊý¾Ý½øÐзÖÎö½â´ð¼´¿É£®

½â´ð ½â£º£¨1£©¾Ýͼ¿ÉÒÔ¿´³ö£¬ÓëÑõ»¯Ìú·´Ó¦µÄÁòËáµÄÖÊÁ¿Îª18.75g¡Á39.2%=7.35g£¬ÌúÄÜÓëÁòËá·´Ó¦Éú³ÉÁòËáÑÇÌú£¬¹Ê·´Ó¦Íê³Éºóº¬ÓеÄÈÜÖÊÊÇÁòËáÌúºÍÁòËáÑÇÌú£¬¹ÊÌ7.35£»Fe₂£¨SO₄£©₃¡¢Fe₂SO₄£»
£¨2£©ÉèÌúµÄÖÊÁ¿Îªx
Fe+H₂SO₄¨TFeSO₄+H₂¡ü
56              2
x                              1.0g
$\frac{56}{2}=\frac{x}{1.0g}$
x=28g
·ÏÌúƤÖÐÌúµ¥ÖʵÄÖÊÁ¿·ÖÊýΪ£º$\frac{28g}{33g}¡Á100%$¡Ö84.85%
´ð£º·ÏÌúƬÖÐÌúµ¥ÖʵÄÖÊÁ¿·ÖÊýΪ84.85%£»
£¨3£©ÉèÑõ»¯ÌúµÄÖÊÁ¿Îªy£¬
Fe₂O₃+3H₂SO₄¨TFe₂£¨SO₄£©₃+3H₂O
160   294
y     7.35g
 $\frac{160}{294}=\frac{y}{7.35g}$
y=4g
¹Êº¬ÓÐÌúµÄÖÊÁ¿Îª£º4g¡Á$\frac{112}{160}$=2.8g
¹ÊÉúÐâÇ°ÌúµÄÖÊÁ¿Îª28g+2.8g=30.8g£¬¹ÊδÉúÐâÇ°ÌúƬµÄÖÊÁ¿Îª£º£¨33g-28g-4g£©+30.8g=31.8g£»
´ð£ºÎ´ÉúÐâÇ°ÌúƬµÄÖÊÁ¿Îª31.8g£®

µãÆÀ ±¾Ì⿼²éµÄÊǸù¾Ý»¯Ñ§·½³ÌʽµÄ¼ÆË㣬Íê³É´ËÌ⣬¹Ø¼üÊÇÕÆÎÕ»¯Ñ§·½³ÌʽµÄÊéд£¬Êý¾ÝµÄÓ¦Óã®