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

a: 45.9 meters

b: 4.29 seconds

step-by-step explanation:

a: h(t)=1/2(-9.8)(3)^2+0(3)+90

h(t)=-4.9(3)^2+90

h(t)=-44.1+90

h(t)=45.9 meters

b: 0=1/2(-9.8)(t^2)+0t+90

0=-4.9t^2+90

-90=-4.9t^2

18.37=t^2

t=4.29 seconds

in the second question, the numbers aren't exact, but they're a close approximation.

b.final