Calcium oxide reacts with water in a combination reaction to produce calcium hydroxide: cao(s) h2o(l) → ca(oh)2(s) in a particular experiment, a 2.50-g sample of cao is reacted with excess water and 2.80 g of ca(oh)2 is recovered. what is the percent yield in this experiment

The answer to your question is:

% yield = 84.8

Explanation:

Data

MW CaO = 56 g

MW H2O = 18 g

MW Ca(OH)2 = 74 g

CaO = 2.5 g

Ca(OH)2 = 2.8 g

Balanced Reaction

                    CaO   +    H2O      ⇒      Ca(OH)2

                   56g of CaO     --------------- 74 g  Ca(OH)2

                   2.5 g                ---------------   x

                   x = 3.3 g of Ca(OH)2

% yield =

% yield = 84.8

the answer is either b or c