Gen Chem 1

Isotope Practice

1. Copper exists in nature as a mixture of two isotopes, 63Cu and 65Cu. The 63Cu isotope has natural abundance of 69.16% and a mass of 62.930 amu. What is the mass of 65Cu isotope?

2. There are 2 naturally occurring isotopes of Ga: 69Ga (68.926 amu) and 71Ga. If there exists 60.300% of 69Ga, what is the mass of 71Ga?

3. Fill in the blanks:

Symbol Z (Atomic #) N (# of neutrons) A (atomic Mass)

22 48

22 40

25Mg 25

9 10

1. Identify the isotope with the following # of protons, neutrons, and electrons

Given:

#p #n #e

(a) 71 104 71

(b) 50 68 50

(c) 3 3 3

Particle-Mole and Mixed Mole Conversions

Show all work (with units) in dimensional analysis form.

1 mole = 6.02 x 10^23 particles (atoms, molecules, formula units)

1. How many atoms are in 3.93 moles of Nickel?

2. How many moles would a sample of 4.52 x 10^27 formula units of BaCl2 contain?

3. How many moles in 7.90 x 10^18 molecules of NO?

4. How many formula units would 0.8280 moles of NaCl contain?

5. What is the mass in grams of 3.65 x 10^22 atoms of iron?

Electron Configuration Practice

Write the long electron configurations.

Scandium

Chlorine

Cobalt

Potassium

Chromium

Write the noble gas or abbreviated notations.

Tellurium

Manganese

Tin

Xenon