An isotope, x, of a particular element has an atomic number of 8 and a mass number of 18. therefore:

a. x is an isotope of oxygen.
b. x has 10 neutrons per atom.
c. x has an atomic mass of 15.9994.
d. a and b.
e. a, b, and c.

Which of the following is always a reactant in a combustion reaction? oxygen nitrogen hydrogen carbon

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 mass of natural gas (ch4) must you burn to emit 276 kj of heat?