chem1211hw ch2

1

CHEM1211K Homework Chapter 2 Fall 2013 To get full credit, show your math. 1. Write the empirical formula of a compound with molecules containing 12 carbon atoms, 14 hydrogen atoms, and 6 oxygen atoms. 2. Calculate the number of protons, neutrons, and electrons in 112 48 Cd. 3. Gallium has an atomic mass of 69.723 amu. The Ga-69 (68.926 amu) is 60.11%. What is the amu of the other isotope? 4. The element X has three naturally occurring isotopes. The masses (amu) and % abundances of the isotopes are given in the table below. Calculate the average atomic mass of the element. 5. A certain mass of carbon reacts with 23.3 g of oxygen to form carbon monoxide. How many grams of oxygen would react with that same mass of carbon to form carbon dioxide, according to the law of multiple proportions? 6. An unknown element is found to have three naturally occurring isotopes with atomic masses of 35.9675 (0.337%), 37.9627 (0.063%), and 39.9624 (99.600%). Name the unknown element. 7. Calculate the mass (in ng) of 2.33 x 10 20 atoms of oxygen. 8. Convert 400 pm to Å. 9. Write the empirical formula for the compound formed by a. Na + and PO 4 3- b. Zn 2+ and SO 4 2- c. Fe 3+ and CO 3 2-

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Page 1: CHEM1211HW Ch2

CHEM1211K Homework Chapter 2 Fall 2013

To get full credit, show your math.

1. Write the empirical formula of a compound with molecules containing 12 carbon atoms,

14 hydrogen atoms, and 6 oxygen atoms.

2. Calculate the number of protons, neutrons, and electrons in 11248

Cd.

3. Gallium has an atomic mass of 69.723 amu. The Ga-69 (68.926 amu) is 60.11%. What

is the amu of the other isotope?

4. The element X has three naturally occurring isotopes. The masses (amu) and %

abundances of the isotopes are given in the table below. Calculate the average atomic

mass of the element.

5. A certain mass of carbon reacts with 23.3 g of oxygen to form carbon monoxide. How

many grams of oxygen would react with that same mass of carbon to form carbon

dioxide, according to the law of multiple proportions?

6. An unknown element is found to have three naturally occurring isotopes with atomic

masses of 35.9675 (0.337%), 37.9627 (0.063%), and 39.9624 (99.600%). Name the

unknown element.

7. Calculate the mass (in ng) of 2.33 x 1020 atoms of oxygen.

8. Convert 400 pm to Å.

9. Write the empirical formula for the compound formed by

a. Na+ and PO4

3-

b. Zn2+

and SO42-

c. Fe3+

and CO32-

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