Question

19£®Îª²â¶¨ÓÉÂÈ»¯ÄƺÍÁòËáÄÆ×é³ÉµÄ»ìºÏÎïµÄ×é³É£¬Ä³»î¶¯Ð¡×é½øÐÐÈçÏÂʵÑ飬ȡ¸Ã»ìºÏÎïÑùÆ·40gÈ«²¿ÈÜÓÚ306.6gË®ÖУ¬½«ËùµÃÈÜÒºµÈ·ÖΪ4·Ý£¬ÓÉËĸöС×é½øÐÐʵÑ飬ÿ×éͬѧ·Ö±ðÏòÆäÖмÓÈËÏà¼äÖÊÁ¿·ÖÊýµÄÂÈ»¯±µÈÜÒº£®ÊµÑéÊý¾ÝÈçϱíËùʾ£º

	µÚÒ»·Ý	µÚ¶þ·Ý	µÚÈý·Ý	µÚËÄ·Ý
¼ÓBaCl2ÈÜÒºÖÊÁ¿£¨g£©	15	20	25	30
·´Ó¦ºóËùµÃ³ÁµíÖÊÁ¿£¨g£©	6.99	9.32	11.65	11.65

£¨1£©µÚËÄ×éËùµÃÈÜÒºµÄÈÜÖÊΪÂÈ»¯ÄƺÍÂÈ»¯±µ£»
£¨2£©Ô­»ìºÏÎïÖÐÁòËáÄƵÄÖÊÁ¿·ÖÊýÊǶàÉÙ£¿
£¨3£©Ç¡ºÃ·´Ó¦Ê±£¬ËùµÃÈÜÒºµÄÈÜÖÊÖÊÁ¿·ÖÊýÊǶàÉÙ£¿

Answer 1

·ÖÎö ·ÖÎöÊý¾Ý¿ÉÖª£¬µÚÈý·Ý»ìºÏÎïµÄÈÜÒº¸ú25gδ֪ÖÊÁ¿·ÖÊýµÄÂÈ»¯±µÈÜҺǡºÃÍê³É·´Ó¦£¬Çҵõ½ÁòËá±µ³ÁµíµÄÖÊÁ¿Îª11.65g£®ÓÉ11.65g³Áµí¡¢40g¹ÌÌå»ìºÏÎïºÍ25gÂÈ»¯±µÈÜÒº¸ù¾ÝÂÈ»¯±µÓëÁòËáÄÆ·´Ó¦µÄ»¯Ñ§·½³Ìʽ¾Í¿ÉÒÔ¼ÆËã³ö±¾Ìâ´ð°¸£®

½â´ð ½â£º£¨1£©·ÖÎöÊý¾Ý¿ÉÖª£¬µÚÈý·Ý»ìºÏÎïµÄÈÜÒº¸ú25gδ֪ÖÊÁ¿·ÖÊýµÄÂÈ»¯±µÈÜҺǡºÃÍê³É·´Ó¦£¬µÚËÄ×éÖÐÂÈ»¯±µ¹ýÁ¿£¬¹ÊËùµÃÈÜÒºµÄÈÜÖÊΪÂÈ»¯ÄƺÍÂÈ»¯±µ£»
¹ÊÌÂÈ»¯ÄƺÍÂÈ»¯±µ£»
£¨2£©Éè»ìºÏÎïÖÐÁòËáÄƵÄÖÊÁ¿Îªx£¬Éú³ÉÂÈ»¯ÄƵÄÖÊÁ¿Îªy
BaCl₂+Na₂SO₄=2NaCl+BaSO₄¡ý
      142   117   233
       x     y   11.65g
$\frac{142}{x}=\frac{117}{y}=\frac{233}{11.65g}$
x=7.1g£¬y=5.85g
Ô­»ìºÏÎïÖÐÁòËáÄƵÄÖÊÁ¿·ÖÊýÊÇ£º$\frac{7.1g¡Á4}{40g}¡Á100%$=7.1%£»
´ð£ºÔ­»ìºÏÎïÖÐÁòËáÄƵÄÖÊÁ¿·ÖÊýÊÇ7.1%£»
£¨3£©Ç¡ºÃ·´Ó¦Ê±£¬ËùµÃÈÜÒºµÄÈÜÖÊÖÊÁ¿Îª£º10g-7.1g+5.85g=8.75g
ËùµÃÈÜÒºµÄÖÊÁ¿Îª£º£¨40g+306.6g£©¡Â4+25g-11.65g=100g
ËùµÃÈÜÒºµÄÈÜÖÊÖÊÁ¿·ÖÊýÊÇ£º$\frac{8.75g}{100g}¡Á100%$=8.75%£®
´ð£ºËùµÃÈÜÒºµÄÈÜÖÊÖÊÁ¿·ÖÊýÊÇ8.75%£®

µãÆÀ ±¾ÌâÖ÷Òª¿¼²éº¬ÔÓÖÊÎïÖʵĻ¯Ñ§·½³Ìʽ¼ÆËãºÍÈÜÖÊÖÊÁ¿·ÖÊýµÄ¼ÆË㣬ÄѶȽϴó£®