f you want to make 5.62 L of 0.200 M potassium dichromate solution, what mass of potassium dichromate must you weigh out? Include your units.
volume , V = 5.62 L
use:
number of mol,
n = Molarity * Volume
= 0.2*5.62
= 1.124 mol
Molar mass of K2Cr2O7,
MM = 2*MM(K) + 2*MM(Cr) + 7*MM(O)
= 2*39.1 + 2*52.0 + 7*16.0
= 294.2 g/mol
use:
mass of K2Cr2O7,
m = number of mol * molar mass
= 1.124 mol * 2.942*10^2 g/mol
= 3.307*10^2 g
Answer: 331 g
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