A student determined that 2.5 grams of methane, CH4, produced 139kJ of heat in a bomb
calorimeter. What is AErxn for the combustion of
methane in kJ/mole CH4?

i had this on my unit activity, i can you if you are a plato student. are you a plato student?

i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.