Given:
P = 775.0 torr
= (775.0/760) atm
= 1.0197 atm
V = 315.0 mL
= (315.0/1000) L
= 0.315 L
T = 25.0 oC
= (25.0+273) K
= 298 K
find number of moles using:
P * V = n*R*T
1.0197 atm * 0.315 L = n * 0.08206 atm.L/mol.K * 298 K
n = 1.314*10^-2 mol
From reaction,
Mol of MnO2 reacted = mol of Cl2 formed
= 1.314*10^-2 mol
Molar mass of MnO2,
MM = 1*MM(Mn) + 2*MM(O)
= 1*54.94 + 2*16.0
= 86.94 g/mol
use:
mass of MnO2,
m = number of mol * molar mass
= 1.314*10^-2 mol * 86.94 g/mol
= 1.142 g
Answer: 1.14 g
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