Using freezing point depression to find molecular weight Mass of weighing paper (for solvent): 0.37 g
Mass of lauric acid + weighing paper: 3.37 g F. P. lauric acid: 43.2°C Kf (lauric acid): 3.9°C/m
Mass of weighing paper (for solute): 0.40
Mass of unknown solute + weighing paper: 0.70 g F. P. of mixture with unknown #1 (benzoic acid): 40.0°C Theoretical MW: 122 g/mol; experimental MW: 122 g/mol F. P. of mixture with unknown #2 (camphor): 40.7°C Theoretical MW: 152 g/mol; experimental MW: 156 g/mol F. P. of mixture with unknown #3 (stearic acid): 41.8°C Theoretical MW: 284 g/mol; experimental MW: 278 g/mol
a. Calculate molality (m), in mol/kg, using the formula Delta t=Kf*m . The Kf value for lauric acid is 3.9°C•kg/mol.
b. Calculate moles of benzoic acid solute, using the molality and the mass (in kg) of lauric acid solvent.
c. Calculate the experimental molecular weight of benzoic acid, in g/mol.
d. Determine the accepted molecular weight of benzoic acid from its formula, C6H5COOH.
e. Calculate the percent discrepancy between the experimental and accepted values.

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Many reactions take place in aqueous solution. when potential reactants are mixed, a reaction will occur if there is some driving force that favors the formation of products. it is often convenient to categorize reactions in terms of these driving forces: precipitate formation, in which an insoluble solid is formed, weak electrolyte formation, as in a neutralization reaction involving water, or transfer of electrons, as in a redox reaction. these reactions can be represented by full molecular equations, which contain all species in the reaction mixture, or by net ionic equations, which show only the species that actually undergo a change. the latter does not contain the spectator ions, which do not undergo a net change or do not take part in the reaction. part a when the following two solutions are mixed: k2co3(aq)+fe(no3)3(aq) the mixture contains the ions listed below. sort these species into spectator ions and ions that react. drag the appropriate items to their respective bins. view available hint(s) spectator ions ions that react part b what is the correct net ionic equation, including all coefficients, charges, and phases, for the following set of reactants? assume that the contribution of protons from h2so4 is near 100 %.ba(oh)2(aq)+h2so4(aq)→ express your answer as a chemical equation. view available hint(s) nothing provide feedback