What mass of hydrogen peroxide will be present in 2 litres of a 5 mola

1.	What mass of hydrogen peroxide will be present in 2 litres of a 5 molar solution? Calculate the mass of oxygen which will be liberated by the decomposition of 200 ml. of this solution.
Answer» Molar mass of H₂O₂ = 34 g mol^-1 1L of 5M solution of H₂O₂ will contain H₂O₂ = 34 × 5 g 2L of 5M solution of H₂O₂ will contain H₂O₂ = 2 × 34 × 5 = 340 g 200 mL of 5M solution will contain H₂O₂ = \(\frac{340}{2000}\) × 200 = 34 g 2H₂O₂ → H₂O + O₂ 68g of H₂O₂ on decomposition will give O₂ = 32g 34g of H₂O₂ on decomposition will give O₂ = \(\frac{32}{68}\) × 34 = 16g

What mass of hydrogen peroxide will be present in 2 litres of a 5 molar solution? Calculate the mass of oxygen which will be liberated by the decomposition of 200 ml. of this solution.

Answer»

Molar mass of H₂O₂ = 34 g mol^-1

1L of 5M solution of H₂O₂ will contain H₂O₂ = 34 × 5 g

2L of 5M solution of H₂O₂ will contain H₂O₂ = 2 × 34 × 5 = 340 g

200 mL of 5M solution will contain H₂O₂ = \(\frac{340}{2000}\) × 200 = 34 g

2H₂O₂ → H₂O + O₂

68g of H₂O₂ on decomposition will give O₂ = 32g

34g of H₂O₂ on decomposition will give O₂ = \(\frac{32}{68}\) × 34 = 16g

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What mass of hydrogen peroxide will be present in 2 litres of a 5 molar solution? Calculate the mass of oxygen which will be liberated by the decomposition of 200 ml. of this solution.

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