According to einstein's equation, if 1 kg of mass "disappears" during a reaction then

If 1 kg of mass disappeared, this only means that all of those mass was converted to energy. We can actually compute for the energy using the formula:

E = m c^2

where m is mass and c is speed of light:

E = 1 kg * (3 x 10^8 m/s^2)2

E = 9 x 10^16 J

personal, she chose to do it.

the answer is:  

line graphs show patterns in data with variables that change over time; whereas, circle graphs show data as parts out of a whole (such as out of 100%).