4. For each of the reactions below, calculate the mass (in grams) of the product formed when 2.5 grams of the underlined reactant completely reacts. Assume that there is more than enough of the other reactant. Be sure to balance the reaction first.

a. Ba(s)+ Cl2(g) --> BaCl2(s)
I. Calculate the percent yield if 2.95 g BaCl2is collected.

b. CaO (s)+ CO2(g) --> CaCO3(s)
I. Calculate the percent yield if 0.68 g CaCO3is collected.

c. Mg (s)+ O2(g) --> MgO (s)
I. Calculate the percent yield if 3.25 g MgO is collected.

d. Al (s)+ O2(g) --> Al2O3(s)
I. Calculate the percent yield if 1.89 g Al2O3is collected.

they it depends on if one believes about radioactivity, they make a geiger counter beep but maybe it was going to beep anyway electronics do wierd things all the time or it was programmed to beep near certain metals.

i wish i could but this one is weird give me abc and i can solve it.

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.