đốt cháy 1 g octan trong bom nhiệt kế. dụng cụ được đặt vào một bình 1,2kg. nhiệt độ của nước và bom nhiệt từ 25 độ tới 33,2 độ C. Cbom = 837 J/K, C nước = 4,186 J/g. tính nhiệt đốt cháy octan (KJ/mol)

"standard molar enthalpy:

h2o ( liquid water ) : - 285.8 kj/mole

h2o ( water vapor ) : - 241.8 kj / mole.

δhrxn = - 241. 8 - ( - 285.8 )= -241.8 + 285.8 = 44.0

answer: 44.0 kj"

it is the most commonly accepted one

answer: any goods being imported from another country may be subject to issued by the federal government are tariffs

explanation:  

tariffs are a tax on anything that are imported from abroad. government use them to protect and boost their local industries and the thought is that they encourage consumers to buy local instead of importing and they will hope will protect jobs and economy in the country that implements them  

i belive it is water