Answer:
6.2 moles of K2CO3 can be converted to 856.8741 grams.
Passes through the kidneys and the good stuff is kept, and the other stuff is passed through leading to the bladder. The once the bladder is full enough to send the message to the brain, urine (waste) is eliminated from the body.
1 significant figure, because there is no decimal after the zero the zero doesn't count.