The mass of the acid that is produced is 17.02 g.
We have to know something about the idea of stoichiometry to enable us to be able to find out the mass of the propionic acid that can be produced in this reaction.
When we look at the reaction equation, we can see that it taken two moles of the dichromate to be able to produce one mole of the propionic acid and also, the molar mass of the dichromate is
By the use of this fact;
Number of moles of the dichromate = 135.8 g/294 g/mol = 0.46 moles
2 moles of the dichromate produced 1 mole of the propionic acid
0.46 moles produces
0.46 moles * 1 mole / 2 moles
= 0.23 moles
Mass of the acid = 0.23 moles * 74 g/mol = 17.02 g
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