One 55 g serving of cereal provides 265.0 mg of sodium, which is 10.9 % of the recommended daily allowance. Determine the amount of sodium (in grams and moles) in the recommended daily allowance.

Question

One 55 g serving of cereal provides 265.0 mg of sodium, which is 10.9 % of the recommended daily allowance. Determine the amount of sodium (in grams and moles) in the recommended daily allowance.

a) Mass (g)

b) Moles (mol)

Answer 1

10.9% (x) = 265.0 mg

x = 2431 mg x 1 g / 1000 mg = 2.431 g (mass of sodium)

(b) moles of Na = 2.431 mols Na x 1 mol / 22.99 g = 0.1058 moles of soldium