What is the molarity of sodium carbonate?
The answers are correct. Notice the method. Two principles involved here: 1) How to go from g to moles 2) Using Amount = volume x concentration, and specifically Total moles = volume (L) x molarity (M) BTW, if your instructor is fussy about significant figures (some are I’m afraid); the 20 mL is only to two significant figures, while the other data are good to four or better. So I would quote my answer to 4, and then add a note that since the volume is only given to 2, perhaps the answer is only good to 2.
