Question

‏How many grams of KMnO , are needed to make 500.0 mL of a 0.200 M solution ?

Answer 1

See below

Step-by-step explanation:

Concentration = moles / volume of solution

or

moles = concentration (moles/liter) X volume of solution (liter)

Convert your volume to liters 500 mL is 0.500 L

moles = 0.200 moles/liter x 0.500 liter (liters cancel each other out)

moles = 0.100 moles

KMnO mass is 110 grams/mole

grams KMnO = 110 grams/mole x 0.100 moles

= 11 grams

Just in case you wrote your question wrong and you meant KMnO₄

KMnO₄ mass is 158 grams/mole

grams KMnO₄ = 158 grams/mole x 0.100 moles

= 15.8