General Chemistry Answers

Ammonium perchlorate NH

4

ClO

4

 is a powerful solid rocket fuel, used in the Space Shuttle boosters. It decomposes into nitrogen N

2

 gas, chlorine Cl

2

 gas, oxygen O

2

 gas and water vapor, releasing a great deal of energy. Calculate the moles of ammonium perchlorate needed to produce 0.070

mol

 of nitrogen. Be sure your answer has a unit symbol, if necessary, and round it to the correct number of significant digits.

Prepare 100 mL of 0.200 bicarbonate buffer, pH 10 by calculating the mass of sodium bicarbonate and sodium carbonate.

    a. Use the Henderson-Hasselbalch equation to calculate the volume of each stock

        solution needed.  pH = pKa + log [conjugate base] / [weak acid]1

    b. Check your calculations with other students. See the instructor if there is uncertainty.

    c. Make the solution and check the pH of a portion of your buffer solution using the pH meter.

                                              L = 245μL 

How much salt and how much water must be mixed to make 250g brine solution that is 50% salt by mass?

A golden breast plate weighing 18.63 kg is dropped in a tub that initially contains water. after the breast plate was totally submerged, the water level rises by 61.87cm. The tub has a diameter of 6 centimeters and the breast plate was said to be made only from gold and silver. Compute for the percentage of each component of the breast plate if the density of gold is 19.3 g/cubic centimeter and silver has a density of 10.49 g/cu

how to obtain clean water from muddy water using old newspaper, a saucepan, a kettle, several plastic tumblers, a knife, an empty 500  mineral bottle, and a short piece of copper pipe.