Question

5.

To make a saturated aqueous solution of ammonia, 470 g of ammonia are dissolved with one liter of water. The density of the resulting solution is 0.89 g/mL. What is the molarity of the solution? Hint: Think about the two quantities you need to calculate the molarity of a solution, then figure out how to get those two quantities from the information supplied in the problem, so that you can calculate the molarity.

6.

You found a 1 pound (454 g) container of drain cleaner, mostly solid sodium hydroxide, that you wish to neutralize by reacting it with vinegar. The vinegar is a 5% solution of acetic acid (meaning that 100 g of vinegar would contain 5 g of acetic acid) and the vinegar has a density of 1 g/mL. How many liters of vinegar will it take to just neutralize the drain opener?

9.

The propellent used to help launch the space shuttle in the solid-fuel boosters attached to the vehicle is 1.1 million pounds of ammonium perchlorate and powdered aluminum. The reaction generating the energy to blast the orbitor into space is:

3 NH₄ClO₄(s) + 3 Al(s) ---> Al₂O₃(s) + AlCl₃(s) + 3 NO(g) + 6 H₂O(g)

The energy generated results from oxidation-reduction chemistry.

Write the symbol for the metallic element that is oxidized in the reaction.



Write the symbol for the element that is reduced in the reaction.



What is the name of the first aluminum containing compound listed as a product of the reaction?



What is the name of the other aluminum containing compound listed as a product of the reaction?

10.

A 0.205 g sample of a monoprotic acid was dissolved in 25 mL of water. The acid solution was titrated to its endpoint with 28.1 mL of 0.0788 M NaOH solution. What is the molar mass of the acid?

Answer 1