Question

How many moles of Na2CO3 are in 100.0ml of a 2.0M solution?

Answer 1

To determine the number of moles of Na2CO3 in the 100.0 ml solution, multiply the molarity (2.0 M) by the volume (0.1 L). The result is 0.2 moles of Na2CO3.

Step-by-step explanation:

To determine the number of moles of Na2CO3 in the 100.0 ml solution, we need to use the molarity of the solution.

Molarity is defined as moles of solute per liter of solution.

In the given case, the molarity is 2.0 M, which means there are 2.0 moles of Na2CO3 in 1 liter of solution.

Since we have 0.1 liter (100.0 ml) of the solution, we can calculate the number of moles by multiplying the molarity and volume:

Number of moles = Molarity x Volume

Number of moles = 2.0 M x 0.1 L = 0.2 moles

Answer 2

M = moles of solute / liters of solution

2.00 M = x / 10.0 L

x = 20.0 mol

Suppose the molarity was listed as 2.0 M (two sig figs). How to display the answer? Like this:

20. mol