# You have a freshly prepared .01 M ascorbic acid (vitamin C) solution. Each liter of this solution contains how many ascorbic acid molecules?

##### 1 Answer

#### Answer:

#### Explanation:

In order to be able to find the number of *molecules* of ascorbic acid you get *per liter* of that solution, you need to know how many moles of ascorbic acid you have *per liter* of solution.

Notice that the problem gives you the molarity of the solution, which is defined as the moles of solute, in your case ascorbic acid, divided by liters of solution.

#color(blue)("molarity" = "moles of solute"/"liters of solution")#

Since your solution has a molarity of *every liter* will contain **exactly**

Now, you know that one mole of any substance contains exactly **Avogadro's number**.

In your case,

#0.01color(red)(cancel(color(black)("moles"))) * (6.022 * 10^(23)"molecules")/(1color(red)(cancel(color(black)("mole")))) = 6.022 * 10^(21)"molecules"#

Rounded to one sig fig, the answer will be

#"no. of molecules" = color(green)(6 * 10^(21)"molecules")#