The decomposition of CaCO3 is given by the equation: CaCO3(s) → CaO(s) + CO2(g) A student heats a 5 g pellet of CaCO3 strongly for 10 minutes over a Bunsen burner flame. After cooling, the student uses an open container to measure the mass of the products formed and finds this to be 2.8 g. Provide an explanation for the decrease in mass of the products compared to the reactant and work out how many molecules of carbon dioxide would form in this reaction.

Must show your work. Include appropriate significant figures and units.​

we need the questions , i may then you.

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.