Answers:
0.0044 mol·L⁻¹; 0.006 66 mol·L⁻¹
Step-by-step explanation:
(1) <em>Before eating</em>
80. mg/100. mL Convert milligrams to grams
= 80. mg/100. mL × 1 g/1000 mg
= 0.080 g/100. mL Convert grams to moles
= 0.080 g/100. mL × 1 mol/180.16 g
= 4.44 × 10⁻⁴ mol/100. mL Convert millilitres to litres
= 4.44 × 10⁻⁴ mol/100. mL × 1000 mL/1 L
= 0.0044 mol·L⁻¹
(2) <em>After eating</em>
120. mg/100. mL Convert milligrams to grams
= 120. mg/100. mL × 1 g/1000 mg
= 0.120 g/100. mL Convert grams to moles
= 0.120 g/100. mL × 1 mol/180.16 g
= 6.661 × 10⁻⁴ mol/100. mL Convert millilitres to litres
= 6.661 × 10⁻⁴ mol/100. mL × 1000 mL/1 L
= 0.006 66 mol·L⁻¹