Question

Table 1: Amount of H2O Displaced for Each Trial-Grams of Solute Used Trial Barometric Pressure (atm) Temperature (°C) Mass of Chemical (g) Water Displaced (mL) Trial 1 NaHCO3 1.006973 20C 1.0g .057L Trial 2 NaHCO3 1.006973 20C 1.0g .085L Trial 3 Na2CO3 1.006973 20C 1.0g .042L Trial 4 Na2CO3 1.006973 20C 1.1g .036L PART A Show your calculation for the molar volume of CO2 from Trial 1 according to your experimental data. Show all work, values, and units in your calculations in order to receive full credit. Your work must be complete, logical, and presented in the correct sequence of operations PART B Show your calculation for the molar volume of CO2 from Trial 2 according to your experimental data. Show all work, values, and units in your calculations in order to receive full credit. Your work must be complete, logical, and presented in the correct sequence of operations PART C Show your calculation for the molar volume of CO2 from Trial 3 according to your experimental data. Show all work, values, and units in your calculations in order to receive full credit. Your work must be complete, logical, and presented in the correct sequence of operations. PART D Show your calculation for the molar volume of CO2 from Trial 4 according to your experimental data. Show all work, values, and units in your calculations in order to receive full credit. Your work must be complete, logical, and presented in the correct sequence of operations. PART E What is the average experimental molar volume of the gas of all 4 trials? Show all work, values, and units in your calculations in order to receive full credit. Your work must be complete, logical, and presented in the correct sequence of operations. PART F What is the percent error in your calculation? Show all work, values, and units in your calculations in order to receive full credit. Your work must be complete, logical, and presented in the correct sequence of operations

Answer 1

Calculation of molar volume of CO2

Part A)

volume of H2 collected = 0.057 L

Using,

V1 = P2.V2.T1/P1.T2

with,

P2, V2 and T2 be experimental pressure, volume and temperature values

T2 = 20 oC + 273 = 293 K

P1 and T1 are STP pressure and temperature values

V1 is volume of CO2 at STP

thus,

V1 = 1.006473 x 0.057 x 273.15/1 x 293 = 0.0535 L

mols of NaHCO3 = 1.0 g/84 g/mol = 0.012 mol

molar volume of CO2 = 0.0535/0.02 = 2.675 L/mol

Part B)

volume of H2 collected = 0.085 L

Using,

V1 = P2.V2.T1/P1.T2

with,

P2, V2 and T2 be experimental pressure, volume and temperature values

T2 = 20 oC + 273 = 293 K

P1 and T1 are STP pressure and temperature values

V1 is volume of CO2 at STP

thus,

V1 = 1.006473 x 0.085 x 273.15/1 x 293 = 0.08 L

mols of NaHCO3 = 1.0 g/84 g/mol = 0.012 mol

molar volume of CO2 = 0.08/0.02 = 4.00 L/mol

Part C)

volume of H2 collected = 0.042 L

Using,

V1 = P2.V2.T1/P1.T2

with,

P2, V2 and T2 be experimental pressure, volume and temperature values

T2 = 20 oC + 273 = 293 K

P1 and T1 are STP pressure and temperature values

V1 is volume of CO2 at STP

thus,

V1 = 1.006473 x 0.042 x 273.15/1 x 293 = 0.03941 L

mols of Na2CO3 = 1.0 g/106 g/mol = 0.0094 mol

molar volume of CO2 = 0.03941/0.0094 = 4.19 L/mol

Part D)

volume of H2 collected = 0.036 L

Using,

V1 = P2.V2.T1/P1.T2

with,

P2, V2 and T2 be experimental pressure, volume and temperature values

T2 = 20 oC + 273 = 293 K

P1 and T1 are STP pressure and temperature values

V1 is volume of CO2 at STP

thus,

V1 = 1.006473 x 0.036 x 273.15/1 x 293 = 0.034 L

mols of Na2CO3 = 1.0 g/106 g/mol = 0.0094 mol

molar volume of CO2 = 0.034/0.0094 = 3.62 L/mol

Part E) average experimental molar volume = 3.62 L/mol

Part F) percent error = (22.4 - 3.62) x 100/22.4 = 83.8%