Molar mass of H2SO4,
MM = 2*MM(H) + 1*MM(S) + 4*MM(O)
= 2*1.008 + 1*32.07 + 4*16.0
= 98.086 g/mol
mass(H2SO4)= 26.0 g
use:
number of mol of H2SO4,
n = mass of H2SO4/molar mass of H2SO4
=(26 g)/(98.09 g/mol)
= 0.2651 mol
Molar mass of NaOH,
MM = 1*MM(Na) + 1*MM(O) + 1*MM(H)
= 1*22.99 + 1*16.0 + 1*1.008
= 39.998 g/mol
mass(NaOH)= 7.28 g
use:
number of mol of NaOH,
n = mass of NaOH/molar mass of NaOH
=(7.28 g)/(40 g/mol)
= 0.182 mol
Balanced chemical equation is:
H2SO4 + 2 NaOH ---> Na2SO4 + 2 H2O
1 mol of H2SO4 reacts with 2 mol of NaOH
for 0.2651 mol of H2SO4, 0.5301 mol of NaOH is required
But we have 0.182 mol of NaOH
so, NaOH is limiting reagent
we will use NaOH in further calculation
Molar mass of Na2SO4,
MM = 2*MM(Na) + 1*MM(S) + 4*MM(O)
= 2*22.99 + 1*32.07 + 4*16.0
= 142.05 g/mol
According to balanced equation
mol of Na2SO4 formed = (1/2)* moles of NaOH
= (1/2)*0.182
= 9.1*10^-2 mol
use:
mass of Na2SO4 = number of mol * molar mass
= 9.1*10^-2*1.421*10^2
= 12.93 g
Answer: 13 g
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