What is the molarity of a saline contact solution that contains 5.90 g of Sodium chloride
in 473 mL of solution?

0.213M

Explanation:

Given parameters:

Mass of sodium chloride = 5.9g

Volume of solution  = 473mL  = 0.473L

Unknown:

Molarity of solution  = ?

Solution:

Molarity is one of the ways of expressing concentration.

It is defined as the number of moles of solute in a given solution;

       mathematically;              

                    Molarity  =

Number of moles of NaCl;

                Number of moles  =

                      molar mass of NaCl  = 23 + 35.5 = 58.5g/mol

               Number of moles  =   = 0.1moles

             Molarity  =   = 0.213M

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.