Please help me double-check my Calculate the molarity of an aqueous solution that contains 36.5g KMnO4 and has a total volume of 375 mL.

My answer is 0.616M but this option is not offered.

The answer to your question is Molarity = 0.6158, I got the same answer as you.

Explanation:

Data

Molarity = ?

Mass of KMnO₄ = 36.5 g

Total volume = 375 ml

Process

1.- Calculate the Molar mass of KMnO₄

KMnO₄ = (1 x 39.10) + (54.94 x 1) + (16 x 4)

            = 39.10 + 54.94 + 64

            = 158.04 g

2.- Calculate the moles of KMnO₄

                158.04 g of KMnO₄ 1 mol

                  36.5 g of KMnO₄  x

                   x = (36.5 x 1) / 158.04

                   x = 0.231 mol

3.- Convert the volume to liters

                  1000 ml 1 L

                    375 ml x

                     x = (375 x 1)/1000

                    x = 0.375 L

4.- Calculate the Molarity

Molarity = moles / volume

-Substitution

Molarity = 0.231 moles / 0.375 L

Result

Molarity = 0.6158

Molarity = 0.616 M

Explanation:

Step 1: Data given

Mass of KMnO4 = 36.5 grams

Molar mass of KMnO4 =  158.03 g/mol

Volume of the solution = 375 mL = 0.375 L

Step 2: Calculate moles KMNO4

Moles KMnO4 = mass KMnO4 / molar mass KMnO4

Moles KMnO4 = 36.5 grams / 158.03 g/mol

Moles KMnO4 = 0.231 moles

Step 3: Calculate molarity of the aqueous solution

Molarity = moles / volume

Molarity = 0.231 moles / 0.375 L

Molarity = 0.616 M

The molarity is 0.616 M, your answer is correct. It must be an error in the options given.

a saline water is fed to a reverse osmosis unit at flow rate o rotameter connected to reject (retentate) line reads 8 installed in reject and permeate line reads 15.2 milli siemens/cm and 300 micro siemens/com respectively.

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.