Take a look at the thermochemical equation for the combustion of hexene gas shown below. If the reaction is conducted in a calorimeter containing 445 mL of water at 19 degrees celsius (initially) and a total of 7.4 grams of hexene (C6H12) is combusted, what will the final temperature of the water be? Assume the density of water is 1 g/mL and the specific heat capacity of water is 4.18 J/gC. Round your answer to 2 decimal places, if necessary. Do not include units in your final answer. C6H12(g) + 9O2(g) --> 6H2O(g) + 6CO2(g)
Hcombustion = -432.09kJ/mol

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.

Voltaic cells produce a positive overall charge. what does this indicate? a. the reaction is likely to be endothermic. b. the reaction is spontaneous. c. the reaction is not likely to occur. d. the reaction is not spontaneous.

Identify arrows pointing to bonding electrons. done h-0-0-h ) intro