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.

 

Answers (1)

We know that the molecular mass of H_{2}O_2 – 34

Mass of H_{2}O_2 present in 1 molar solution – 34 g

Therefore, the mass of H_{2}O_2 present in 2 litres of 1 molar solution – 2 \times 34 = 68g

Hence, the mass of H_{2}O_2 that is present in 200ml solution of 1 molar H_{2}O_2 will be


= \frac{34}{5}= 6.8g

2H_{2}O_{2} \rightarrow 2H_{2}O + O_{2}

     68g                      32g

   6.8g                     3.2g

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