Na2CO3 ==> Na2O + CO2
PV = nRT for the CO2 gas
Ptotal = PCO2 + PH2O You know Ptotal and you are given PH2O. Make sure you watch the units and solve for PCO2, preferable in mm Hg, then convert to atmospheres by atm = pressure in mm/760. Use that for P in the formula. Solve for n = number of moles.
Then mols = grams/molar mass. You know mols and molar mass, solve for grams which is the answer to a.
b. Using the coefficients in the balanced equation, convert mols CO2 to mols Na2CO3. Note that 1 mol CO2 comes from 1 mol Na2CO3.
Then mols Na2CO3 x molar mass Na2CO3 = grams Na2CO3.
Post your work if you get stuck.
When heated at high temperature, sodium carbonate, Na2CO3decomposes to sodium oxide and carbon dioxide gas. A sample of 587.3 mL gas was collected using water displacement method at 27 °C at a total pressure of 760 mm Hg and vapour pressure of water is 28 mm Hg.
a) calculate the mass of carbon oxide collected
b) calculate the mass of sodium carbonate decomposed
1 answer
1 answer