In this experiment, we Heat up NaHCO 3 in order to produce CO 2 gas. I don\'t kn

Question

In this experiment, we Heat up NaHCO3 in order to produce CO2 gas. I don't know how to solve the Calculations part. Please provide all the steps because I'm really lost.  

Mass of test tube and contents:
Before heating: 22.39
After Heating: 21.72
Mass Loss: .67

Volume of CO2 collected: 300mL

Temperature of CO2: 25 C
Atmospheric pressure: 75.59
Water Vapor pressure at CO2 Temperature: 23.69 mmHg
_______________________________________________________________________________________________________________________________

Calculations
Mass of CO2 collected : ___?
Moles of CO2, n: ____?
System temperature (k), T: ____?
Pressure of CO2 (atm): ____?
Experimental R=pV/nT : _____?
Molar Volume Vm = V/n : _____?
Standard molar volume at STP: ____?

Explanation / Answer

The reaction taking place:

2NaHCO3(s) ---->Na2CO3(s) +CO2(g)+ H2O(g)

mass lost =mass of CO2 produced=67g

mol of CO2 produced=mass/molar mass of CO2=(67g/44.01 g/mol)=1.522 mol

System temperature=25+273=298K

Pressure of CO2 (atm): =atm pressure-partial pressure of water vapor=750.59 -23.69=51.9 mmhg=51.9mmhg *(1atm/760 mmhg)=0.0683 atm

Experimental R=pV/nT :=(0.0683 atm)*(0.3L)/(1.522 mol)(298K)=0.00004517 Latm/Kmol

Molar Volume Vm = V/n =0.3L/1.522mol=0.197 L/mol

At STP, T=273K,P=1 atm,R=0.0821Latm/Kmol,n=1mol

V=nRT/P=(1mol)*(0.0821Latm/Kmol)*(273K)/1atm=22.4L

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