Question

ÔÚ25¡æºÍ101kPaʱ£¬ÓÐÏÂÁз´Ó¦µÄÈÈ»¯Ñ§·½³Ìʽ
H₂£¨g£©+

1

2

O₂£¨g£©¨TH₂O£¨g£©¡÷H=-241.8kJ/mol£»
H₂£¨g£©+

1

2

O₂£¨g£©¨TH₂O£¨1£©¡÷H=-285.8kJ/mol£®
ÒÔÏÂ˵·¨ÖдíÎóµÄÊÇ£¨¡¡¡¡£©

A£®1molH2ȼÉÕÉú³É1molH2O£¨g£©Ê±£¬·Å³ö241.8kJµÄÈÈÁ¿

B£®H2µÄȼÉÕÈÈΪ285.8kJ

C£®O2Ç°ÃæµÄ 1 2 ±íʾ²Î¼Ó·´Ó¦µÄO2µÄÎïÖʵÄÁ¿

D£®1molҺ̬ˮ±ä³ÉË®ÕôÆøʱÎüÊÕ44kJµÄÈÈÁ¿

Answer 1

A£®ÈÈ»¯Ñ§·½³ÌʽÖС÷HΪ¡°-¡±Îª·ÅÈÈ·´Ó¦£¬¸ù¾ÝH₂£¨g£©+

1

2

O₂£¨g£©¨TH₂O£¨g£©¡÷H=-241.8kJ/mol£»¿ÉÖª£º1molH₂ȼÉÕÉú³É1molH₂O£¨g£©Ê±£¬·Å³ö241.8kJµÄÈÈÁ¿£®¹ÊAÕýÈ·£®
B£®ÔÚ25¡æºÍ101kPaʱ£¬1 mol¿ÉȼÎïÍêȫȼÉÕÉú³ÉÎȶ¨µÄ»¯ºÏÎïʱËù·Å³öµÄÈÈÁ¿£¬½Ð×ö¸ÃÎïÖʵÄȼÉÕÈÈ£®¸ù¾Ý
H₂£¨g£©+

1

2

O₂£¨g£©¨TH₂O£¨1£©¡÷H=-285.8kJ/mol£®¿ÉÖª£º1molH₂ȼÉÕÉú³ÉÎȶ¨µÄ1molH₂O£¨1£©·Å³ö285.8kJµÄÈÈÁ¿£®µ«È¼ÉÕÈȵĵ¥Î»ÎªkJ/mol£®¹ÊB´íÎó£®
C£®ÈÈ»¯Ñ§·½³ÌʽÖл¯Ñ§¼ÆÁ¿ÊýÖ»±íʾ¸ÃÎïÖʵÄÎïÖʵÄÁ¿£¬¹ÊO₂Ç°ÃæµÄ12±íʾ²Î¼Ó·´Ó¦µÄO₂µÄÎïÖʵÄÁ¿Ëµ·¨ÕýÈ·£®¹ÊCÕýÈ·£®
D£®¸ù¾ÝH₂£¨g£©+

1

2

O₂£¨g£©¨TH₂O£¨g£©¡÷H=-241.8kJ/mol£»¢Ù
H₂£¨g£©+

1

2

O₂£¨g£©¨TH₂O£¨1£©¡÷H=-285.8kJ/mol¢Ú
ÓÉ¢Ù-¢ÚµÃ£ºH₂O£¨1£©=H₂O£¨g£©£»¡÷H=44kJ 1molҺ̬ˮ±ä³ÉË®ÕôÆøʱÎüÊÕ44kJµÄÈÈÁ¿
¹ÊDÕýÈ·£®
¹ÊÑ¡B£®