已知H2(g)+Br2(l)=2HBr(g) △=-72kJ/mol,蒸发1mol Br2(l)需要吸收30KJ能量..已知H2(g)+Br2(l)=2HBr(g) △H=-72kJ/mol,蒸发1mol Br2(l)需要吸收30KJ能量..1mol分子中的化学键断裂时需要吸收的能量/kj H2(g):436 Br2(g):a HBr(g)3

已知H2(g)+Br2(l)=2HBr(g) △=-72kJ/mol,蒸发1mol Br2(l)需要吸收30KJ能量..已知H2(g)+Br2(l)=2HBr(g) △H=-72kJ/mol,蒸发1mol Br2(l)需要吸收30KJ能量..1mol分子中的化学键断裂时需要吸收的能量/kj H2(g):436 Br2(g):a HBr(g)3
已知H2(g)+Br2(l)=2HBr(g) △=-72kJ/mol,蒸发1mol Br2(l)需要吸收30KJ能量..
已知H2(g)+Br2(l)=2HBr(g) △H=-72kJ/mol,蒸发1mol Br2(l)需要吸收30KJ能量..
1mol分子中的化学键断裂时需要吸收的能量/kj H2(g):436 Br2(g):a HBr(g)369
问a是什么..答案是369*2-436-a+30=-72 a=404
我的思路是这样的.
H2(g)+Br2(l)=2HBr(g) △H1=-72kJ/mol
H2(g)+Br2(g)=2HBr(g) △H2=-102kJ/mol
+436+a-2*369=-102
a=200
我的思路哪里错了啊?

已知H2(g)+Br2(l)=2HBr(g) △=-72kJ/mol,蒸发1mol Br2(l)需要吸收30KJ能量..已知H2(g)+Br2(l)=2HBr(g) △H=-72kJ/mol,蒸发1mol Br2(l)需要吸收30KJ能量..1mol分子中的化学键断裂时需要吸收的能量/kj H2(g):436 Br2(g):a HBr(g)3
你的算法是正确的
这个答案是错的,它算反了
△H===反应物键能之和 - 生成物键能之和
式子应是 436+a-369*2 +30==-72
a==200

Province in March this year the temperature fluctuated amplitude sharp average temperature over the same period of 12 years minimum eight-year period up to dust the News News (chief reporter int...

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Province in March this year the temperature fluctuated amplitude sharp average temperature over the same period of 12 years minimum eight-year period up to dust the News News (chief reporter intern Zhu Jie Liu Jia) just in the past three months, frequent cold air activities in the province,ken griffey sneakers, the temperature fluctuated,ken griffey shoes, amplitude intense, high winds, dust storms frequently visit, the weather was just warm up, immediately cold, and such changes in the weather so many people doubt: this is the spring of spring in March it? April 7,kids griffey shoes, the reporter learned from the Northwest Regional Climate Center, in March this year, the province hit a monthly average temperature of nearly 12-year low, while the dust storms and 16 times total for the period up to the past eight years. province last month,jordans heels, average temperature a 12-year period to a minimum Northwest Regional Climate Center,nike air max nm, according to statistics, in March 2010 compared with year-round , Ha Tay province near normal temperatures, east high 1 ?? -2 ??; the provinces average monthly temperature for the past 12 years the minimum period. Precipitation in March compared with year-round, the individual parts of the western Hexi Corridor,griffey shoes, Gansu, north-central, southern Gansu in the north and below normal two to Jiucheng Longnan; the rest of the province to 1 times 20% above normal, which in most parts of Jiuquan City the high side of one to four times the average annual precipitation over the same period 24 percent above normal, for the most recent three years. one day cold day, hot, frequent low in March, alternating hot weather,air griffey max 1 Fresh water, this weather normal? Weather experts said in March this year, Gansu temperature is still warmer overall state, but often affected by cold air, warm weather this year, no degree of strong previous years, but the warming trend has not changed. In March, the province overall climate change compared with previous years is not very clear weather in the provinces history, these weather phenomena have occurred several times, not specifically, based on monitoring data,ken griffey shoes, only there are more unusual local climate. Sandstorm 16 the same period in the past eight years up 3 months, the dust weather ones is our common experience, the Northwest Regional Climate Center, said Zhao Hongyan in March, the province accumulated dust storm appeared 16 times for the same period in the past eight years the most. March sandstorm occurred mainly in the west and some parts of north-central part of Gansu where the number of occurrences in which the province Minqin up,ken griffey jr shoes, there were, 4. March, Gansu blowing weather for the past six years up to the same period. Currently, weather stations across the province, a total of 80 stations, 40 stations have emerged blowing weather,women griffeys, there have been 112 times total. According to reports, the province in March, there were two regional dust storm weather process, respectively, on March 19 and 28 to 29 days. March 19, which for the first time this year the process of regional dust storms, which, Jingtai, Yongdeng,ken griffey shoes, silver,king griffey shoes, Lanzhou 4 places the emergence of strong dust storms. In addition, the province in March gale days earlier than usual ones, for the same period in the past 31 years to the most. Lanzhou rainfall extreme high temperature of 28.4 ?? Lanzhou City in March this year, like a roller coaster of temperatures: 11 to 18 days, Lanzhou high temperature 3 ??, especially the citys maximum temperature of 18 record the highest value over the same period, of which the urban area is 28.4 ??. According to meteorological monitoring, Lanzhou City, the normal average temperature in the month slightly higher, but the temperature fluctuated a larger amplitude, which topped the monthly extreme maximum temperature record for the period of most, same with the 2003 and 2007, the average temperature in early partial low, most places in the last 20 years the lowest values ??in mid-temperature ultra-high,nike heels shoes, over the same period were recorded at the forefront of history. And uneven distribution of rainfall, which the urban and Trinidad and Tobago Yuzhong early precipitation, the rest did not appear effective precipitation. Up to now, most of the city of Lanzhou up to 32 days -34 days where no effective rainfall, air is very dry,new ken griffey shoes, soil moisture and spring production of extremely unfavorable. 3 months there have been dust in Lanzhou city weather for 10 days. It is worth mentioning that on March 19, Siberia, strong dry cold air invasion of Lanzhou City, daily average around 48 hours the temperature dropped 7.5 ?? -8.5 ??, the daily maximum temperature dropped 12.4 ?? -15.1 ??,air griffey max 1 black, the cold front crossing , the provinces with the emergence of blowing sand, floating dust weather, including urban areas and sandstorms occur Yongdeng, the minimum visibility to 400 meters.

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反应热的数值是生成物-反应物，你算反了