This is easy, just read the last question. (already asked this question before)

how many grams of sodium hydroxide could be produced if 1.2l of 3.0 m calcium hydroxide are consumed?

na2co3 + ca(oh)2 --> 2naoh + caco3

now i know how to do equations like this, just a bit confused on how to use my conversion factors.

do i need to use the 3.0 molarity in this equation or can i just use molar volume of a gas (22.4l/1 mole)?