50mL of ethanol (density=0.79 g/mL) is dissolved by 400 mL of water. What is the concentration of ethanol in this solution?

The concentration of ethanol in this solution : 2.14 M

Molarity is a way to express the density of the solution

Molarity shows the number of moles of solute in every 1 liter of solute or mmol in each ml of solution

Where

M = Molarity

n = Number of moles of solute

V = Volume of solution

Ethanol(C₂H₅OH) MW =46,06844 g/mol[

the law of conservation of mass states that in a chemical reaction, the total mass of reactants is equal to the total mass of products. because atoms are only rearranged in a chemical reaction, there must be the same number of sodium atoms and chlorine atoms in both the reactants and products