How many grams of kbr are required to make 350. ml of a 0.115 m kbr solution? 3.04 g 4.79 g 40.3 g 0.338 g?

of KBr is required to make 350 mL of 0.115 M KBr solution.

Further Explanation:

Concentration is defined as the amount or quantity of solute present in specific amount of solution. In order to evaluate concentration of various solutions, different concentration terms are used. Some of these are mentioned below.

1. Molarity (M)

2. Molality (m)  

3. Mole fraction (X)  

4. Parts per million (ppm)  

5. Mass percent ((w/w) %)  

6. Volume percent ((v/v) %)  

Molarity is defined as the number of moles of solute that can be dissolved in one litre of the solution. It is denoted by M and its unit is mol/L.

The formula to calculate molarity of KBr solution is as follows:

   ...... (1)

Rearrange equation (1) to calculate moles of KBr.

       ...... (2)

Substitute 0.115 M for molarity of KBr solution and 350 mL for volume of KBr  solution in equation (2).

The formula to calculate moles of KBr is as follows:

                                      ...... (3)

Rearrange equation (3) for mass of KBr.

              ...... (4)

Substitute 0.04025 mol for moles of KBr and 119.002 g/mol for molar mass of KBr in equation (4).

Therefore 4.79 g of KBr is required to make 350 mL of a 0.115 M KBr solution.

Learn more:

1. Determine the moles of water produced:

2. What is the molarity of the stock solution?

Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Concentration terms

Keywords: molarity, KBr, 350 mL, 0.115 M, 4.79 g, mass, molar mass, concentration terms, concentration, solute, moles of solute, volume.

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.