If 185mg of propanethial-s-oxide is produced, how many moles were reacted?

Question

Cutting into an onion releases two chemicals that when combined produce a gas, propanethial-s-oxide gas. This gas causes the “tears” experienced when cutting onions.

A(aq) + B(aq) --> CH3-CH2-CH=S=O(g)

If 185mg of propanethial-s-oxide is produced, how many moles of compound “A” were reacted?

If 0.78mL of onion volume enabled the 185mg of propanethial-s-oxide production, what was the molarity of compound “A” in the onion?

Answer 1

185 mg C₃H₆OS x (1 g C₃H₆OS/1000 mg C₃H₆OS) x (1 mol C₃H₆OS/90.14 g C₃H₆OS) x (1 mol A/1 mol C₃H₆OS) =

0.002 mol A

[A] = 0.002 mol A x (1/0.78 mL) x (1000 mL/1 L) =

2.56 M