Question

What is the molarity of the 8.76 g of Na2S dissolved in 0.500 L of solution?

Answer 1

.224 M

Step-by-step explanation:

To begin, we need to find the molar mass of Na2S

• Na=22.99g, S=78.05g

• 2(22.99)+1(32.07)=78.05

To find Molarity, we use the equation M=moles/Liters of solution

We are given grams, so we must divide by the molar mass of Na2S to find moles.

• 8.76g Na2S / 78.05g/mol Na2S= .112 moles

Now we use our Molarity equation:

• .112 moles Na2S / .500L of solution = .224 M