How many moles of allicin are present in 6.50 mg of this substance?

              4.01 × 10⁻⁵ Moles

Explanation:

Allicin (C₆H₁₀S₂O) is a sulfur containing organic compound which is responsible for the aroma of Garlic.

                        Molecular Mass of Allicin  =  162.26 g.mol⁻¹

                        Mass given  =  6.50 mg  =  0.0065 g

Formula Used:

                        Moles  =  Mass ÷ Molar Mass

Putting values,

                        Moles  =  0.0065 g ÷ 162.26 g.mol⁻¹

                        Moles  =  0.0000401 mol

Or,

                        Moles  =  4.01 × 10⁻⁵ mol