Answer is: 4)Mass
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According to one acid-base theory, a water molecule acts as an acid when the water molecule (3) donates an H+.
Given concentration of NaCl=15%
Means ,
In every 100g of Solution 15g of NaCl is present .
Now
So ,



<u>37.5g of NaCl present in 250g of solution.</u>
Radiant energy or electrical energy