The addition of h2 to c=c double bonds is an important reaction used in the preparation of margarine from vegetable oils. if 40ml of h2 and 40 ml of ethylene (c2h4) are allowed to react at 1.3 atm, the product ethane(c2h6) has a volume of 40 ml .

calculate the amount of pv work done. c2h4(g)+h2(> c2h6(g)
tell the direction of the energy flow.
the energy flow is directed into the system.
the energy flow is directed from the system

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.

What is the ph of a 0.0010 m hno3? 1.0 3.0 4.0 5.0

Calculate the molarity of each of the following solutions. part a) 0.12 mol of lino3 in 5.5 l of solution part b) 60.7 g c2h6o in 2.48 l of solution part c) 14.2 mg ki in 100 ml of solution