k = 0.00130
PO2 = 0.21(1 atm)
Solve for C = (O2) at 1 atm total P.
C = 0.00130*(0.896)(0.21) = (O2) M
Solve for C = (O2) M.
I would calculate mols O2 in 4.80 L H2O at 1 atm and 0.896 atm. Subtract top find mols O2 released if the pressure changed from 1.00 to 0.896 atm. The problem doesn’t specify units
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