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Determining precision for your calculations after you have made calculations for known values.
The grams of solute are required.
The mass of solute is 3.5 g
c = Molarity = 0.1 M
M = Molar mass = 350 g/mol
V = Volume of solution = 100 mL = 0.1 L
n = Number of moles
m = Mass of solute
Molarity is given by

Molar mass is given by

The mass of solute is 3.5 g
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K2MnO4+(2)H2O —>KMnO4+(2)KOH+(2)H2
Coefficients are in parentheses and subscripts are just normal letters