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Chapter 3: Q 28E (page 168)

Question: One 55-gram serving of a particular cereal supplies 270 mg of sodium, 11% of the recommended daily allowance. How many moles and atoms of sodium are in the recommended daily allowance?

Short Answer

Expert verified

0.0117 mol of Na

7.045 x 1021 atoms of Na

Step by step solution

01

Determine number of moles

270 mg of Na = 0.270 g of Na = (1 g = 1000mg, 1 mg = 10-3 g)

Number of moles of Na = (0.270 g) / (23 g/mol) = 0.0117 mol of Na

02

Determine number of atoms

As per Avogadro鈥檚 rule

1 mol of Na = 6.022 x 1023 atoms of Na

0.0117 mol of Na = 0.0117 mol x 6.022 x 1023 atoms of Na

= 0.07045 x 1023 atoms of Na

= 7.045 x 1021 atoms of Na

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