Use this data to calculate the molar mass: Trial 1 - Sodium Bicarbonate Trial 2
ID: 1050867 • Letter: U
Question
Use this data to calculate the molar mass:
Trial 1 - Sodium Bicarbonate
Trial 2 - Sodium Bicarbonate
Trial 3 - Sodium Carbonate
Trial 4 - Sodium Carbonate
What is the average experimental volume calculated for sodium carbonate and sodium bicarbonate?
What is the percent error in your calculation?
Amount of H2) Displaced for each Trial - Grams of Solute used Trial Barometric Pressure Temperature C Mass of Chemical Water Displaced Trial 1 NaHCO3 1.006973 20.1 1.1 g .059 L Trial 2 NaHCO3 1.006973 20 2.0 g .087 L Trial 3 Na2CO3 1.006973 22 1.2 g .044 L Trial 4 Na2CO3 1.006973 20 1.1 g .036 LExplanation / Answer
Calculation of molar mass of NaHCO3
moles of H2 = PV/RT
Trial 1
moles of H2 = 1.006973 x 0.059/0.08205 x (20.1 + 273) = 0.0025 mol
1 mole of NaHCO3 gives 1 mole of H2
molar mass = 1.1/0.0025 = 440 g/mol
Trial 2
moles of H2 = 1.006973 x 0.087/0.08205 x (20 + 273) = 0.0036 mol
1 mole of NaHCO3 gives 1 mole of H2
molar mass = 2/0.0036 = 548.83 g/mol
Trial 3
moles of H2 = 1.006973 x 0.044/0.08205 x (22 + 273) = 0.0018 mol
1 mole of NaHCO3 gives 1 mole of H2
molar mass = 1.2/0.0018 = 666.67 g/mol
Trial 4
moles of H2 = 1.006973 x 0.036/0.08205 x (20 + 273) = 0.0015 mol
1 mole of NaHCO3 gives 1 mole of H2
molar mass = 1.1/0.0015 = 733,33 g/mol
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