Calculate the strength of 20 V of `H_(2)O_(2)` in terms of
grams per litre

Explanation

To calculate the strength of a 20 V solution of hydrogen peroxide (H₂O₂) in grams per litre, we can follow these steps:

### Step 1: Understand the Volume Strength
The term "20 V" means that 20 volumes of oxygen gas are produced by 1 volume of H₂O₂ when it decomposes. This means that 1 litre of H₂O₂ will produce 20 litres of oxygen gas.

### Step 2: Calculate the Volume of Oxygen Produced
From the reaction of H₂O₂, we know that:
\[ 2 H₂O₂ \rightarrow 2 H₂O + O₂ \]
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