Inorganic Chemistry Answers

Calculate the volume, in litres, occupied by 1.0 mol of an ideal gas at STP.

calculate the mass of argon gas in 40.0 L at STP

Avogadro’s number N_A = 6.022 x 10²³

1. Write the full electron configuration (with details of sub-shells) for the

element Rhenium.

2. Fluorine exists in diatomic form (e.g. F₂ in each oxygen molecule) under

standard temperature and pressure (STP). If the density of fluorine at STP is

1.696 kg/m³, calculate the number of fluorine molecules in 1 m³ of fluorine,

at STP.

3. The lattice structure of potassium chloride is similar to face-centred cubic

structure, with a unit cell as shown in Figure 3, where the blue spheres are

the potassium atoms, and the green spheres are the chlorine atoms. If the

density of a potassium chloride crystal is 1984 kg/m³, find the side length of

the unit cell.

What is the percent by mass of 5.0 g of iron (II) sulfate dissolved in 75.0 g of water?

2.

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

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

a.Suppose 100 g of PbS is reacted with 4g of C and 20g O₂.

Find the limiting reactant for this reaction

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

2.

Lead metal is obtained from lead sulphide 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.

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

Find the limiting reactant for this reaction.     

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

(d) If 31.2g Pb is obtained as the yield. calculate the percentage of yield.

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