The concentration of 0.11 mole/l does not depend upon the volume. I am assuming that you did not intend to write that 5.0 mL of juice contains 0.011 moles of Vitamin C.
You are going to need the molecular weight of Vitamin C (ascorbic acid) to convert mole to mg.
The formula is C6H8O6, so the molecular weight is 176 g/mol.
0.011 moles/l = 1.936 g/liter
is the Vitamin C concentration in mass/volume units.
60 mg of juice presumably has a volume of 60 ml, since OJ is mostly water.
For 60 mg of vitamin C, the MDA is
(60*10^-3 g)/(1.936 g/liter) = 0.031 liter. That is only about one ounce.
I don't believe that number. Recheck your assumptions and typing.
For the MDA of 60 mg, you would require
How many mL of orange juice would be required to get the recommended daily allowance of 60 mg of vitamin C? (Concentration of vitamin C is .011 moles/L in 5.0 mL of juice).
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