Question

The molecular formula of allicin, the compound responsible for the characteristic smell of garlic, is C₆H₁₀OS₂.

(a) What is the molar mass of allicin?
g/mol


(b) How many moles of allicin are present in 6.40 mg of this substance?
mol


(c) How many molecules of allicin are in 6.40 mg of this substance?
allicin molecules


(d) How many S atoms are present in 6.40 mg of allicin?
S atoms

Answer 1

the molar mass of allicin C6H10OS2 = 162.273 g/mol

moles of allicin are present in 6.40 mg = 3.94 X 10 ^-5 moles

No molecules of allicin are in 6.40 mg of this substance =

2.373 × 10 ¹⁹.

there are 2 moles of S in each mole of allicin so we have 3.94 X 10 ^-5 x 2 moles of S

= 7.88 x 10 ^-05 moles of S

In 1 mole of S we have 6.02 x 10²³ atoms of S so in 7.88 x 10 ^-05 moles of S moles of S we have

6.02 x 10²³ atoms / mol x 7.88 x 10 ^-05 moles of S = 4.74 x 10 ¹⁹ atoms of S