I have a bar of soap that weighs 135 grams. If I leave a sink dripping on the same spot on the bar of soap for 45 minutes how much of the soap will be eroded and how much will the soap weigh. The sink is dripping at 60 drips per minute.

It is impossible to answer this question without more information. The amount of soap eroded will depend on the type of soap, the pH of the water, and the temperature of the water.