not sure how to do this

What mass of NaHCO3(s) must have been present at the beginning of the reaction? Hide Hint Hint: Your goal is to do the steps you did in the previous section, but in reverse. You know the mass of the Na2CO3 product: 4.09g The molar mass of Na2CO3 is 105.99g/mol The molar mass of NaHCO3 is 84.01g/mol How can you use this information to find the mass of the initial amount of NaHCOs ? g x unlimited submissions remaining Score: 0/1 Comments: Your goal is to do the steps you did in the previous section, but in reverse. Your goal is to do the steps you did in the previous section, but in reverse