I'm not sure what you mean by you got reaction one wrong, but given the information I guess you want the CO2 given the reaction one that is in the question, and that you have to react 1 gram of NaHCO3.
So, your first step is identifying your plan, You need volume of CO2, but to get it you need the moles of CO2, but to get that based off of the chemical equation, you can only find the moles of NaHCO3.
In the problem you have one gram of NaHCO3 to react, so in order to find the moles, you convert NaHCO3 using the molar mass. 1g * 1mol/84g = 0.012 mol NaHCO3.
Now you have molar mass, use the equation to convert into the moles of CO2. Now you have 0.006 moles of CO2.
Lastly, is finding the volume using the gas law. PV=nRT. Fill out all the variables
0.93*V = 0.006 * 0.082 * 486 *If R= 0.082, remember to convert T into Kelvin
As a result, V = 255 mL
I hope this helps, if I misread the question. Please don't hesitate to correct me.