In commercial cleaning agents, the materials used in making them are printed on the body of the container.
Let's say cleaning agent A has 30% of its mass as NaOH, and the total weight of the agent is 150g.
The mass of NaOH is therefore 30% × 150g = 45g.
Therefore for cleaning agent A with a mass of 150g, the mass of NaOH present in it is 45g.
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