Inorganic Chemistry Answers

 Explain the following statements in accordance to variation in characteristic of atoms in Periodical Table.

 (a) Choose and explain which element has the greater value for following properties: i. electron affinity.

    Na or F. 

ii. electronegativity.

    Cl or Ca.        

iii. ionization energy.

    S or Se.

iv. atomic radius.

    C or Sn.

v. metallic property.

    Si or Br. 

By referring to the chemical equation given, calculate the volume of nitrogen gas in litres, required to react with 40.0 g of magnesium at a pressure of 2.25 atm and a temperature of 15 °C.

            3Mg (s) + N₂ → Mg₃N₂ (s)

A nitrogen gas container has a volume of 35.0 L. Calculate the mass of nitrogen in the container if the gas has a pressure of 1800 torr at 42°C

Lead metal is obtained from lead sulfide through the following reaction:

          2PbS(s) + 2C(s) + 3O₂(g) → 2Pb(s) +2CO(g) + 2SO₂(g)

 (a)If 100g of PbS is reacted with excess C and O_2, calculate the mass of lead metal obtained.  ( 5 )

 (b)Suppose 100 g of PbS is reacted with 4g of C and 20g O₂.

Find the limiting reactant for this reaction.     

  ( 4 )

 (c)For question (b) above, calculate the mass of lead metal obtained.  ( 4 )

 (d)By referring to the question (c) above, If 31.2g Pb is obtained as the yield. Calculate the percentage of yield.  ( 2 )

 (e)Calculate mass of oxygen is needed to produce 500g of lead metal.

Potassium tetra nitrodiaminecobaltate(III)

valence(valency, valence number) in the number of valence -------------an atom has form, with one or more other---------- .

Hydrogen bromide with a volume of 224 liters (n. o.) reacted with an excess of ethylene. The mass of the formed bromoethane

is equal to

Co ordination number

Cr(NH3)6Cl3