By ideal gas equation
PV = nRT
given , volume (V ) = 4.50 L
pressure (P) = 0.121 atm
R = 0.082 L-atm/mol.K
temperature (T) = 50.2 + 273 K = 323.2 K
then moles of hydrogen gas will be ; n = (PV/RT)
= (0.1214.50)/0.082323.2)
= 0.0205
from the balanced reaction
mole ratio of Iron (III) oxide to Hydrogen is 1 : 3
therefore moles of Iron (III) oxide formed
= 0.0205/3
= 0.0068
mass of Iron (III) oxide will be produced
= 0.0068 160 (g/mol)
= 1.09 g
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