11. How much magnesium reacts with 12.5g of oxygen to produce 31.5g of 5 points magnesium oxide?
a) 18.0g
b) 19.09
c) 20.0g
d) insufficient, data

The solid xy decomposes into gaseous x and y: xy(s) m x(g) + y(g) kp = 4.1 (at 0 °c) if the reaction is carried out in a 22.4 l container, which initial amounts of x and y will result in the formation of solid xy?