A 0.8378 g sample of calcium oxalate is heated to 1000oC,
CaC2O4 = CaO + CO + CO2
Calculate
(a) the moles of CaO remaining after ignition
(b) the mmoles of CO evolved
(c) the weight of CO2 produced.
mols CaC2O4 initially = g/molar mass = ?
All of the reactants and products are 1:1 so conversion of one to the other is easy.
mols CaO = mols CaC2O4 = mols CO = mols CO2
a) mols CaO = mols CaC2O4
b) mols CO x 1000 = mmoles CO
c) g CO2 = mols CO2 x molar mass CO2
To calculate the moles of CaO remaining after ignition, mmoles of CO evolved, and weight of CO2 produced, we need to use stoichiometry and the given information. Let's break down the problem step by step.
Step 1: Calculate the moles of calcium oxalate (CaC2O4)
To calculate the moles of CaC2O4, divide the given mass by the molar mass of CaC2O4. The molar mass of CaC2O4 is the sum of the atomic masses of calcium (Ca), carbon (C), and oxygen (O).
Molar mass of CaC2O4 = (40.08 g/mol) + (12.01 g/mol) + (16.00 g/mol) + (16.00 g/mol) + (16.00 g/mol) + (16.00 g/mol) = 128.07 g/mol
moles of CaC2O4 = mass of CaC2O4 / molar mass of CaC2O4
moles of CaC2O4 = 0.8378 g / 128.07 g/mol
Step 2: Use the balanced equation to find the stoichiometric ratios
The balanced equation tells us that 1 mole of CaC2O4 produces 1 mole of CaO, 1 mole of CO, and 1 mole of CO2. Therefore, the number of moles of CaO remaining after ignition is equal to the number of moles of CaC2O4 we calculated in step 1.
(a) Moles of CaO remaining after ignition = moles of CaC2O4
Moles of CaO remaining after ignition = 0.8378 g / 128.07 g/mol
(b) Moles of CO evolved = moles of CaC2O4 (using the same logic as in step 2)
Moles of CO evolved = 0.8378 g / 128.07 g/mol
(c) Weight of CO2 produced can be calculated by using the moles of CaC2O4 and the molar mass of CO2. The molar mass of CO2 can be calculated by summing the atomic masses of carbon and oxygen.
Molar mass of CO2 = (12.01 g/mol) + (16.00 g/mol) + (16.00 g/mol) = 44.01 g/mol
Weight of CO2 produced = moles of CaC2O4 * molar mass of CO2
Weight of CO2 produced = 0.8378 g / 128.07 g/mol * 44.01 g/mol
Take the calculated values from each step and plug them into the respective formulas to find the final answers for (a), (b), and (c).