Reference no: EM132251965

Section 1.

State the symbol and charge for the following polyatomic ions:

a. phosphate____________

b. permanganate___________

c. chlorate____________

d.ammonium____________

e.acetate____________

2.Predict the charge on the indicated transition metal ion.

Charge?

a. MoCl5               Mo_____________

b. Fe2O3               Fe_____________

c. AgBr                Ag_____________

d. KFe(SO4)2           Fe_____________

e.Mn(OH)2            Mn_____________

Section 2

1. If you have 168 grams of C₆H₁₂O₆ (glucose), how many moles and molecules of that compound do you have?

2. What is the mass of the following in grams (3 significant places):

a. two moles of beryllium?

b. one-half mole of ethyl alcohol (C₂H₅OH)?

c. one millimole of sulfur dioxide?

d. 5.25 x 10²³ molecules of hydrogen chloride?

3. Calculate the mass in grams of one atom of gold from its atomic mass and Avogadro's number.

Section 3

1. What is the percent composition of each element in KClO₃ (answer in tenths)?

Atomic weights: K = 39    Cl = 35.5    O = 16

2. Calculate the percent composition for each of the elements in the compound Na₃PO₄ (answer in tenths).

Section 4

1. LSD (lysergic acid diethylamide) is made up of 74.27% C, 7.79% H, 12.99% N, 4.95% O. What is the empirical formula?

2. Determine the simplest formula of a compound which has the following analysis: 16.78% Na, 13.16% NH₄, 0.74% H (in addition to that in NH₄), and 69.32% PO₄.

3. A compound has the following percentage composition: 78.14% boron and 21.86% hydrogen. Calculate the simplest formula for the compound.

4. A 5.00 gram sample of an oxide of lead contains 4.33 g of lead. Derive the simplest formula for the compounds.

5. A chemist determined experimentally the molar mass of a compound to be 26. The simplest formula is C₁H₁. What is the molecular formula?

6. Using the empirical formula BH₃, find the true molecular formula of the compound by using the information that the molar mass of the compound is 27.7.

Section 5.

Balance the following equations by inspection:

1. CO_(g) + MnO_2(s)                   MnO(s) + CO_2(g)

2. B₂H_6(g) + O_2(g)                      B₂O_3(s) + H₂O_(g)

3. Mg₃N₂(g) + H₂O                   Mg(OH)2(s) + NH₃(g)

4. H₂ + O₂                     H₂O 

5. Cu(NO₃)₂                  CuO + NO₂ + O₂