To find the mass of the water, we can use the following equation based on the conservation of mass:
\[ \text{Total Mass} = \text{Mass of Water} + \text{Mass of Salt} + \text{Mass of Iodine} \]
We know the total mass of the new mixture is 225 grams, the mass of salt is 5.0 grams, and the mass of iodine is 15.0 grams. Let's denote the mass of water as \( x \).
So, we have: \[ 225 = x + 5.0 + 15.0 \]
Combining the masses of salt and iodine: \[ 225 = x + 20.0 \]
Now, to solve for \( x \), we subtract 20.0 grams from both sides: \[ x = 225 - 20.0 \] \[ x = 205.0 \text{ grams} \]
Thus, the mass of the water is 205 grams.
The correct answer is B. 205 grams.
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