Inorganic Chemistry Answers

What is the molar absorptivity of a 1.0 x10-⁵ M analyte with an absorbance reading of 0.003 at 517 nm wavelength?

Describe the different types of analytes which can be analyzed using the different methods of optical analyses.

From Lambert-Beer’s law (T = e^-kbC), derived mathematically A = abC (or A = εbC).

Ksp value for concentrated solution is equal to 

Explain the following:

a) Why does increasing the temperature cause a substance to change in succession from a solid to a liquid to a gas? Explain. 

b) Explain why a liquid has a definite volume but a gas does not?

c) Discuss how does an amorphous solid differs from a crystalline solid?

d) Explain with examples, how bonds are formed in ionic compounds and covalent compounds.

e) Covalent bonding occurs in both molecular and covalent network solids. Why do these two kinds of solids differ so greatly in their hardness and melting points?

A reaction to convert ammonia into nitric acid involves the following chemical equation: 

            4 NH3 (g) + 5 O2 (g) 4 NO(g) + 6 H2O(g)

 Assume that 1.50 g of NH3 reacts with 2.75 g O2. 

i. Determine the limiting reactant.

ii. Calculate how many grams of NO and H2O will form in the reaction above.

iii. Calculate how many grams of the excess reactant will remain after the reaction is complete. 

iv. If the yield obtained for NO is 1.80 grams and yield obtained for H2O is 1.50 grams, calculate the percent yield of NO and H2O in this reaction.

        (Atomic mass of N = 14 ; O = 16 ; H = 1)

Explain why pentane is insoluble in water

Calculate the total amount of energy (in kJ) necessary to raise the temperature of 2.00 L of ethanol (density

= 0.7849 g/cm3

) from 18 0C to its boiling point (78.3 0C) and then to fully vaporize the liquid. Assume that 

it is a closed system where no heat exchange with the surroundings take place.

(Given: Cethanol = 2.44 J/g·K; heat of vaporization of ethanol at 78.3 0C = 38.56 kJ/mol.)

[5 marks)

A water soluble salt is reacted separately with HCl, H SO and NaOH and form precipitates. When this salt is 2 4

heated thoroughly a black residue is formed liberating a gas. The salt is,

Explain the following: a} Why does increasing the temperature cause a substance to change in succession from a solid to a liquid to a gas? b) Explain why a liquid has a definite volume but a gas does not? c) Discuss how does an amorphous solid differs from a crystalline solid? d) Explain with examples, how bonds are termed in ionic compounds and covalent compounds. e)Covalent bonding occurs in both molecular and covalent network solids. Why do these two kinds of solids differ so greatly in their hardness and melting points?