Inorganic Chemistry Answers

Infrared spectral analysis of the following three complexes showed a set of two IR bands for the νCO stretching frequencies of 1956 & 1875 cm-1; 1930 & 1850 cm-1; and 1979 & 1897 cm-1. Match the correct set of IR bands to the given compounds and justify your reason.

(a) (η5 -C5H5)2 Ti (CO)2
(b) (η5 -C5(CH3)5) (η5 -C5H5) Ti (CO)2
(c) η5 - C5(CH3)5)2Ti(CO)2

Count the number of valence electron per metal of the reaction products. Are they obeying the 18 valence-electron rule? Give comments.
(a) (PR3)2 Ir (CO) Cl + dppe --------> Ir (dppe)2 Cl + 2PR3 + CO
(b) (PR3)2 Ir (CO) Cl + CO ----------> (PR3)2 Ir (CO)2 Cl
(c) V(CO)6 + Na-------------------------> [V(CO)6]- + Na+
(d) (η5 - C5H5)2 Ni + NO------------> η5 -C5H5 Ni (NO) + C5H5

Na/Hg
(e) (C5H5)2 Ni -------------------------> η5 - C5H5 Ni (η3 - C5H7)
EtOH

Count the number of valence electron per metal of the following compounds and then, elucidate the structure.
(a) Ru3 (μ-CO)2 (CO)8 (bipy)
(b) RuCl (PPh3) (η1–Ph2PCH2PPh2) (η5–C5H5)

Name the complex:
(a) [Ir Cl H2 (PMe3)2 (CO)]

f an HPLC procedure is running at a pressure of 5.76×108 Pa , what is its running pressure in torr?

Hydrogen can be obtained economically as a bi-product in the electrolysis of______

1. What is the empirical formula of a compound that is 58.80% barium, 13.75% sulfur and 27.45% oxygen by mass?

2. By chemical analysis, a molecular compound was found to consist of 80% carbon and 20% hydrogen by mass. By measuring the volume of a known mass of the compound in the gaseous phase, its molecular mass was found to be 30. Find the empirical and the molecular formulas of the compound.

1. Compounds containing sulfur and oxygen are serious air pollutants; they represent the major cause of acid rain. Analysis of a sample of a pure compound reveals that it contains 50.1% sulfur and 49.9% oxygen by mass. What is the empiral formula of the compound?

2. A compound with the empirical formula CH2O has a weight of 180 g/mol. What is the molecular formula?

3. What is the molecular formula of a compound that has a molecular weight of 92 and an empirical formula of NO2?

1. Calculate the percent composition by mass of nitric acid.

2. What is the percent composition of chromium in K2Cr2O7?

3. Find the following:
Given: Sodium Dihydrogen Phosphate, NaH2PO4

a.) formula weight
b.) percent composition of oxygen
c.) weight in grams of 2.7 moles

1. Octane, C8H18, is a substance in premium gasoline. How many moles are in 95.0 grams of octane?

2. What is the mass of 1.2 X 10^24 molecules of O2

3. How many moles are in 9.52g of MgCl2

4. How many moles are present in 180 grams of NaOH?

5. What is the mass in grams of 10.0 X 10^6 SO2 molecules?