Three substances are poured in a cylinder with different densities. Draw the cylinder with the three layers and identify the sub

The mass of KBr required is 16.7 g. This concludes from a volume of 0.400 L and a concentration of 0.350 M. Utilizing the molarity formula, moles are calculated as 0.14, leading to a molecular weight calculation of 119 g/mol, thus resulting in a mass of 16.7 g of KBr.

Response:

1.98 M

Clarification:

Provided data

• Starting volume (V₁): 93.2 mL

• Starting concentration (C₁): 2.03 M

• Water volume added: 3.92 L

Step 1: Convert V₁ to liters

Using the relationship 1 L = 1000 mL.

Step 2: Calculate the final volume (V₂)

The final volume is the total of the initial volume and the added water volume.

Step 3: Calculate the final concentration (C₂)

Utilizing the dilution rule.

It must be a physical change unless a chemical substance interacts with the metal surface, resulting in a chemical change.