1)
Molar mass of Br2 = 159.8 g/mol
mass(Br2)= 30.1 g
use:
number of mol of Br2,
n = mass of Br2/molar mass of Br2
=(30.1 g)/(1.598*10^2 g/mol)
= 0.1884 mol
Molar mass of Cl2 = 70.9 g/mol
mass(Cl2)= 11.3 g
use:
number of mol of Cl2,
n = mass of Cl2/molar mass of Cl2
=(11.3 g)/(70.9 g/mol)
= 0.1594 mol
Balanced chemical equation is:
Br2 + Cl2 ---> 2 BrCl +
1 mol of Br2 reacts with 1 mol of Cl2
for 0.1884 mol of Br2, 0.1884 mol of Cl2 is required
But we have 0.1594 mol of Cl2
so, Cl2 is limiting reagent
we will use Cl2 in further calculation
Molar mass of BrCl,
MM = 1*MM(Br) + 1*MM(Cl)
= 1*79.9 + 1*35.45
= 115.35 g/mol
According to balanced equation
mol of BrCl formed = (2/1)* moles of Cl2
= (2/1)*0.1594
= 0.3188 mol
use:
mass of BrCl = number of mol * molar mass
= 0.3188*1.154*10^2
= 36.77 g
Answer: 36.8 g
2)
Cl2 is limiting reagent
3)
According to balanced equation
mol of Br2 reacted = (1/1)* moles of Cl2
= (1/1)*0.1594
= 0.1594 mol
mol of Br2 remaining = mol initially present - mol reacted
mol of Br2 remaining = 0.1884 - 0.1594
mol of Br2 remaining = 2.898*10^-2 mol
Molar mass of Br2 = 159.8 g/mol
use:
mass of Br2,
m = number of mol * molar mass
= 2.898*10^-2 mol * 1.598*10^2 g/mol
= 4.631 g
Answer: 4.63 g
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