What is the molarity of a magnesium chloride solution with 90.5 g of MgCl2 dissolved in a solution with a total volume of 2300 mL?

Molarity = 0.41 M

Explanation:

Given data:

Mass of MgCl₂ = 90.5 g

Volume of solution = 2300 mL (2300/1000 = 2.3 L)

Molarity of solution = ?

Solution:

Number of moles of MgCl₂:

Number of moles = mass/molar mass

Number of moles = 90.5 g/ 95.2 g/mol

Number of moles = 0.95 mol

Molarity:

Molarity = number of  moles / volume in L

Molarity = 0.95 mol / 2.3 L

Molarity = 0.41 M

answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.