Answer:
The molarity of the solution is 0,45 M.
Explanation:
We know that molarity is a concentration measure that expresses moles of solute per liter of solution (1000ml). First we proceed to calculate the mass of 1 mole of compound from the atomic weights of the elements of the periodic table and then we calculate the molarity by a simple rule of three:
Weight 1 mol C2H5OH= (Weight C)x2 + (Weight H)x6 + Weight 0
Weight 1 mol C2H5OH=12 g x 2 + 1g x 6 + 16 g= 46 g/mol
46 g ---1 mol ethanol
1,77g----x= (1,77g x 1 mol ethanol)/46 g= 0,038 mol ethanol
85 ml solution-----0,038 mol ethanol
1000ml solution---x= (1000ml solution x0,038 mol ethanol)/85 ml solution
<em>x=0,45 M---> The solution is 0,45 M</em>
