How much energy is given off by the following reaction, if 162.5 g of oxygen reacts with 216.7 g of ammonia (NH3)? (16 pts)
4 NH3 + 5 02 → 4 NO + 6 H2O
AH = -1225.6 kJ

A) +1245 kJ
B) +39830 kJ
C) -39830 kj
D) -1245 k)

Ihat will happen if i added baking soda to vinegar

A3.37-mg sample of protein was chemically digested to convert its nitrogen into ammonia and then diluted to 100.0 ml. then 10.0 ml of this solution was placed in a 50-ml volumetric flask and treated with 5 ml of phenol solution plus 2 ml of sodium hypochlorite solution. the sample was diluted to 50.0 ml, and the absorbance at 625 nm was measured in a 1.00-cm cuvette and found to be 0.486. for reference, a standard solution was prepared from 10.0 mg of nh4cl (molar mass = 53.49 grams/mole) dissolved in 1.00 l of water. then 10.0 ml of this standard was placed in a 50-ml volumetric flask, treated in the same manner as the unknown, and the absorbance found to be 0.323. finally, a reagent blank was prepared using distilled water in place of unknown, it was treated in the same manner as the unknown, and the absorbance found to be 0.076. calculate the weight percent of nitrogen in the protein.

How could a student test the effect of removing heat from a gas that is stored in a sealed container? what must occur in order for matter to change states?