100 ml of agno3 at 0.1g/ml

turns your skin black

What is your question?

because it helpful for production of melanin

To calculate the mass of AgNO3 in 100 ml of a solution at a concentration of 0.1 g/ml, you need to use the formula:

Mass = Volume x Concentration

In this case, the volume is 100 ml and the concentration is 0.1 g/ml. Plugging these values into the formula, we get:

Mass = 100 ml x 0.1 g/ml

Mass = 10 g

Therefore, there are 10 grams of AgNO3 in 100 ml of the solution.