Industrially, nitric acid is produced by the Ostwald process, as represented by the following equations: 4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(l) 2NO(g) + O2(g) → 2NO2(g) 2NO2(g) + H2O(l) → HNO3(aq) + HNO2(aq) What mass of NH3 (in grams) must be used to produce 1.11 tons of HNO3 by the Ostwald process, assuming an 80.0 percent yield in each step (1 ton = 2000 lb; 1 lb = 453.6 g)? Enter your answer in scientific notation.

1.) which of the following is a molecule but not a compound? a.he b.f2 c.h2o d.ch4 2.) what is a physical combination of substances? a.a compound b.a molecule c.a mixture d.an element 3.) what is a chemical combination of substances? a.a compound b.an atom c.a mixture d.an element 4.) what is the relationship between the solute and solvent in a solution? a.they form a compound b.they form a mixture c.they form molecules d.they form chemical bonds 5.) the gases in air dissolve in water. what would be one way to reduce the amount of a gas dissolved in water? a.add more water b.reduce the air pressure c.increase the air pressure d.stir the water 6.) how would you determine the solubility of a substance? a.find how well it dissolved various substances. b.find the mass and the volume of the substance. c.find the temperature at which the substance evaporated. d.find how much i was able to dissolve in a solute. 7.) the periodic table organizes all of the kinds of a.molecules. b.compounds. c.atoms. d.ions. 8.)what distinguishes two substances combined to become a compound vs. two substances combined to become a mixture? a.whether they can be easily separated b.whether they chemically bond together c.whether they both are visible d.whether they are heterogeneous 9.) the principle components of air are: n2 78% o2 21% ar 0.95% co2 0.038% this is a solution of a.molecules and atoms. b.molecules. c.compounds and molecules. d.atoms.

Asalt is best described as a compound that is formed from the reaction between an acid and a base. a strong acid and a weak acid. a strong base and a weak base. an acid and water save and exit next submit

In a chemical reaction, the number of moles of the reactants a. should never be equal to the number of moles of the products. b. may or may not be equal to the number of moles of the products. c. depends on the amount of product that is formed. d. should always be equal to the number of moles of the products.