Sodium oxide reacts with water to produce sodium hydroxide. 20.0 g of sodium oxide is dissolved in 500 mL of water. Neglecting the change in volume, the concentration of the resulting NaOH solution is

Question

Sodium oxide reacts with water to produce sodium hydroxide. 20.0 g of sodium oxide is dissolved in 500 mL of water. Neglecting the change in volume, the concentration of the resulting NaOH solution is  M. (Nearest integer)

[Atomic mass: Na = 23.0, O = 16.0, H = 1.0]

Canvas Classes · Accepted Answer

Strategy:
 First, write the balanced chemical equation for the reaction of sodium oxide with water to find the moles of  produced. Then calculate the molarity of the resulting solution.

Step 1: Balanced chemical equation

1 mole of  yields 2 moles of .

Step 2: Calculate moles of 
Molar mass of .

Step 3: Moles of  produced

Step 4: Calculate Molarity ()
Volume = 500 mL = 0.5 L.

Step 5: Express as 
.
Rounding to the nearest integer: 13.

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