What is the mass in grams of na 2 co 3 (s) (molar mass = 105.98 g/mol) that, when dissolved in 125 ml of water, will make a 0.15 m aqueous solution?

Explanation:

Hello,

In this case, we consider the equation defining molarity, in order to compute the mass that is present into 125 mL of an aqueous 0.15M of sodium carbonate (solute), Na₂CO₃ as shown below:

Now, since the unknown is the mass which comes from the moles, by solving for it and subsequently using its molar mass, one obtains:

Best regards.

the answer is a and have a great day

catya that's not even a b or c