A200.0ml flask of unknown gas was placed in a hot water bath. the temperature of the bath was found to be 99 degrees c. the pressure of the flask was 733mmhg. the flask with the unknown gas in it had a mass of 126.593g. the same flask weighed 125.623g when it was empty. determine the mass f the unknown gas in the flask. determine the molar mass of an unknown gas. (assume that the ideal gas law is obeyed and use r= 0.0821 l atm/mol k show all work.)

the answer is b & c i believe : )

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.