The equation for the reaction that occurs when lead(II) oxide is heated with coke in a blast furnace is: 2PbO+c -->2Pb+CO2
(i)State, with a reason, whether PbO is oxidised or reduced in this reaction.
(ii)Calculate the minimum mass, in tonnes, of coke needed to react with 44.6 tonnes of lead(II) oxide.
[1 tonne=10^6g]
(3 marks)
Mass of coke needed=.................tonnes
Calculate the minimum mass, in tonnes, of coke needed to react with
44.6 tonnes of lead(II) oxide.
Pb is +2 on the left, zero on the right. That's a gain of electons and that is xxxxx.
tonnemoles PbO = 44.6/molar mass PbO
Convert tonne mols PbO to tonne mols C
Now convert tonne mols C to tonnes. toones = tonne mols C x atomic mass C.
ifk
To determine whether PbO is oxidized or reduced in the given reaction, we need to compare the oxidation state of lead in the reactants (PbO) and products (Pb).
In PbO (lead(II) oxide), the oxidation state of lead is +2. In Pb (lead), the oxidation state of lead is also +2. So, there is no net change in the oxidation state of lead.
Therefore, we can conclude that PbO is not oxidized or reduced in this reaction.
Now let's calculate the minimum mass of coke needed to react with 44.6 tonnes of lead(II) oxide.
From the balanced equation, we can see that 1 mole of PbO reacts with 1 mole of coke. The molar mass of PbO is 207.2 g/mol and the molar mass of coke (C) is 12.01 g/mol.
First, let's convert the given mass of PbO to moles:
44.6 tonnes = 44.6 x 10^6 g
moles of PbO = mass of PbO / molar mass of PbO
moles of PbO = (44.6 x 10^6 g) / 207.2 g/mol
Next, let's calculate the moles of coke needed using the mole ratio from the balanced equation:
moles of coke = moles of PbO
Finally, let's convert the moles of coke to mass in tonnes:
mass of coke = moles of coke x molar mass of C / (10^6 g/tonne)
Inserting the values into the equation, we get:
mass of coke = [(44.6 x 10^6 g) / 207.2 g/mol] x (12.01 g/mol) / (10^6 g/tonne)
Now, we can evaluate this expression to find the minimum mass of coke needed.
mass of coke = [(44.6 x 10^6) / 207.2] x 12.01 / 10^6 tonnes
Calculating this expression gives us the minimum mass of coke needed in tonnes.
how do i convert mols PbO to tonne mols C
and tonne mols C to tonnes? like, what numbers to put in ?