A solution is made by adding 105.96g of C2H6O to enough water to make a liter of solution. What is the molarity of this solution? Question 5 options:
3.3 M
1.3 M
0.30M
2.3 M
3.0 M
1.0 M
2.0 M
Explanation: Molarity can be calculated using the following rule: Molarity = number of moles of solute / volume of solution
1- getting the number of moles: We are given that: mass of solute = 105.96 grams From the periodic table: atomic mass of carbon = 12 grams atomic mass of hydrogen = 1 gram atomic mass of oxygen = 16 grams Therefore: molar mass of C2H6O = 2(12) + 6(1) + 16 = 46 grams Now, we can get the number of moles as follows: number of moles = mass / molar mass = 105.96 / 46 = 2.3 moles
2- The volume of solution is given = 1 liter
3- getting the molarity: molarity = number of moles of solute / volume of solution molarity = 2.3 / 1 molarity = 2.3 M
