Question 15

Calculate the average kinetic energies of CH4 and N2 molecules at 273K and at 546K.

Question 13

An 11.2 liter sample of gas is determined to contain 0.50 M of N2.  At the same temperature and pressure, how many moles of gas woul there be in a 20.0 liter sample

Question 12

Hydrochloric acid (75.0 ml of 0.25M ) is added to 225.0 ml of 0.0550M Ba(OH)2 solution.  What is the concentration of the excess H+ or OH- left in this solution?

Question 11

How many grams of silver chloride can be prepared by the reaction of 100.0 ml of 0.20M silver nitrate with 100.0 ml of 0.15M CaCl?  Calculate the concentrations of each ion remaining in solution after precipitation is complete.

Question 10

Which of the following solutions of strong electrolytes contains the largest number of chloride ions: 100.0ml of 0.30M Al Cl3, 50.0 ml of 0.60M MgCl2, or 200.0 ml of 0.40 M NaCl?

Question 9

The compound adrenaline contains 56.79% C, 6.56% H, 28.37% O and 8.28% N by mass.   What is the empirical formula for adrenaline?

Question 8

Calculate the mass of 500. atoms of iron (Fe).

Question 7

How is the mass percent of elements in a compound different for a 1.0 gram sample versus a 100. gram sample versus a 1 mole sample of the compound?

Question 6

In an experiment, it was found that the total charge on an oil drop was 5.93E-18 C.   How many negative charges does the drop contain?

Question 5

An element’s most stable ion forms an ionic compound with bromine, having the formula XBr2.   If the ion of element X has a mass number of 230 and has 86 electrons, what is the identity of the element, and how many neutrons does it have?