ÌâÄ¿ÄÚÈÝ
¡¾ÌâÄ¿¡¿ÈÈ»¯Ñ§·½³Ìʽ£ºC£¨Ê¯Ä«£¬s£©£«2H2£¨g£©===CH4£¨g£©,¦¤H£½a
2C£¨Ê¯Ä«£¬s£©£«H2£¨g£©===C2H2£¨g£©,¦¤H£½b
2C£¨Ê¯Ä«£¬s£©£«2H2£¨g£©===C2H4£¨g£©,¦¤H£½c
ÒÑÖª£ºa>c>b£¬¶ÔÏÂÁз´Ó¦£ºC2H2£¨g£©£«H2£¨g£©===C2H4£¨g£©,¦¤H£½x
2CH4£¨g£©===C2H4£¨g£©£«2H2£¨g£© ,¦¤H£½y£¬ÏÂÁÐÅжÏÕýÈ·µÄÊÇ
A£®x>0£¬y<0 B£®x<0£¬y>0 C£®x>0£¬y>0 D£®x<0£¬y<0
¡¾´ð°¸¡¿A
¡¾½âÎö¡¿
ÊÔÌâ·ÖÎö£º¢ÙÒÑÖªC£¨Ê¯Ä«£¬s£©+2H2£¨g£©¨TCH4£¨g£©£»¡÷H=a£¬¢Ú2C£¨Ê¯Ä«£¬s£©+H2£¨g£©¨TC2H2£¨g£©£»¡÷H=b£¬¢Û2C£¨Ê¯Ä«£¬s£©+2H2£¨g£©¨TC2H4£¨g£©£»¡÷H=c£¬ÀûÓøÇ˹¶¨ÂÉ£¬¢Û-¢Ú£¬µÃµ½C2H2£¨g£©+H2£¨g£©C2H4£¨g£©¡÷H=c-b£¬ÒÑÖªc£¾b£¬ËùÒÔx=c-b£¾0£»Í¬Àí£º¢Û-¢Ù¡Á2£¬µÃµ½2CH4£¨g£©C2H4£¨g£©+2H2£¨g£©¡÷H=c-2a£¬ÒÑÖªa£¾c£¬ËùÒÔy=c-2a£¼0£»×ÛÉÏËùÊöx£¾0£¬y£¼0£¬¹ÊÑ¡A¡£
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿