Hy is produced by the reaction of 118.5 mL of a 0,8775-M solution of H3PO, according to
2Cr+2H3PO4 +3H2+2CrPO4
1. If there is an excess amount of Cr, what mass of Hy will be produced (theoretical
yield)?
2. If the actual yield of H2 is 0.2821 g, find the percent yield of H2?

Solid tin exists in two forms: white and gray. for the transformation sn(s, white) → sn(s, gray) the enthalpy change is -2.1 kj/mol and the entropy change is -7.4 j/(mol*k). a. calculate the gibbs free energy change for the conversion of 1.00 mol white tin to gray tin at -30℃. b. will white tin convert spontaneously to gray tin at -30℃? c. at what temperature are white and gray tin thermodynamically equivalent at a pressure of 1 atm?