What is the concentration of a solution that has 2g of powder in 5 ml of solution?

To find the concentration of the solution, you can use the formula: concentration (C) = mass (m) / volume (V). In this case, the mass of the powder is 2 grams and the volume of the solution is 5 milliliters. Therefore, the concentration is C = 2 g / 5 ml = 0.4 g/ml.