Question

What is a molarity of 50cm3 sample of potassium chlorate solution that yield 0.25g residue after evqporation of water?​

Answer 1

Answer:

What is the molarity of 2.8g KOH in water to give 200 CC of solution?

200 cc = 200 mL = 0.200 L

A 1 molar solution is a solution in which 1 mole of a compound is dissolved in a total volume of 1 litre.

Solving for the number of moles in 2.8 g of KOH.

K = 39 O = 16 H = 1 Molar mass of KOH = 56 g

2.8 g / 56 g per mole = 0.05 moles

If 0.05 moles of KOH is dissolved in 0.200 L of water we get 0.05 moles / 0.200 L >>>> 0.25 moles / liter

So 2.8 g of KOH in 200 mL solution is 0.25 molar solution

Explanation:

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