20. What volume (L) of NH3 gas at STP is produced by the complete reaction of 7.5 g of H2Oaccording to the following reaction? M33N2 (S) + 6H20 () —

ЗMg(ОН)2 (аq) + 2NH3 (g) А) 3.1 В) 9.3 C) 19 D) 28 E) 0.32