On a 5 day wilderness expedition you'll need to heat 4.0kg of water to the boiling point each day. the air temperature will average 25°c. you have available canisters of compressed propane c3h8 fuel, which you'll burn to heat the water. each canister has 100.g of propane in it. what is the minimum number of fuel canisters you must bring? the standard heat of formation of propane at 25°c is −103.85/kjmol. you'll probably find other data in the aleks data resource.

the atomic mass is the bottom number on the element.

-steel jelly

what does the table look like

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.