Answer: Mass of K2CO3 is 37.7g
Explanation: You first need to find the moles of K2CO3 by using the molarity formula.
Molarity = moles/Liters
When you do 0.998 = moles/0.273, you will get 0.272454 moles of K2CO3.
The second step is to use the moles of K2CO3 you found and convert it to grams. As shown in the image. Make sure your final answer has the correct number of significant figures. In the question both of the numbers given have 3 sig figs therefore your final answer also needs to have 3 sig figs.