Which of the following is not a polyatomic ion? a) no3-
b) caco3
c) c2h3o2-
d) c6h5coo-

Suppose you got a low yield of benzoin from your benzoin condensation reaction and thus only have 0.300 g of benzoin to use as the starting material for this reaction. how much concentrated nitric acid should you add? (concentrated nitric acid is 15.8 m). write your answer in the form x. xx ml

The answer for #3 is c but i don't know why

Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.