Question

2.8 g nitrogen is dissolved in 500ml solution. Calculate the molar concentration of nitrogen in the solution.

Answer 1

Solution is a type of homogeneous mixture composed of two or more substances. A solute is a substance which is dissolved in another substance known as solvent. We shall calculate the number of moles and thus its molarity.
${\text{molarity}} = \dfrac{{{\text{moles}}}}{{{\text{volume}}}}$

Complete Step by step solution:
Nitrogen is the element with the symbol N and number 7. it had been first discovered and isolated by Scottish physician Rutherford in 1772. Although Carl Wilhelm Scheele and Cavendish had independently done it at the same time, Rutherford is usually given the credit because his work was published first. The name nitrogen was suggested by French chemist Jean-Antoine-Claude Chaptal in 1790 when it had been found that nitrogen was present in aqua fortis and nitrates.
Molar concentration is also called molarity. It’s the amount of concentration of substance that measures the concentration of a chemical substance, especially of a solute in a solution, in terms of quantity of substance per unit volume of solution. In chemistry, the foremost commonly used unit for molarity is that the number of moles per litre.
Moles of ${N_2}$ $= \dfrac{{2.8}}{{28}} = 0.1$
${\text{molarity}} = \dfrac{{0.1}}{{0.5}} = 0.2$
Thus, molarity is $0.2{\text{ M}}$ .

Note:
Quantities related to molarity:
-Number concentration
-Mass concentration
-Mole fraction
-Mass fraction
Molality is a property of a solution and is defined as the number of moles of solute per unit mass of solvent. SI unit of molality is mol per kilogram.
Molality is used during studying properties of solutions related to vapour pressure and temperature changes. Molality is used because its value doesn’t change with temperature.