calculate the number particles in 3 miles of ethale alcohol
Answers
Answer:
Explanation:
10mL * 0.790 g/cm^3 = 79.0 g of ethanol
Determine the molar mass of ethanol. The molar mass is the sum of the molar masses of each individual atom of the ethanol molecule, which is composed of 2 carbon, 6 hydrogen and 1 oxygen atom. The molar mass of ethanol is then calculated as 46 g/mol.
Divide the amount, in grams, by the molar mass to calculate the number of moles of ethanol. 79 g/ 46 g/mol = 1.7 moles of ethanol
Add water to the ethanol and measure the volume of the resulting solution. For the example, the water and ethanol combine, forming a solution with a volume of 250 mL.
Multiply by the conversion factor for milliliters to liters. The example solution contains 1.7 moles of ethanol in 250 mL of solution. Molarity is expressed in moles per liter and there are 1000 mL in 1 L; therefore, there are 1.7 moles per 0.25 L.
(1.7 mol / 250 mL)*(1 L / 1000 mL) = 1.7 mol / 0.25 L
Determine the molarity in terms of moles per liter. The previous step identified 1.7 moles of ethanol per 0.25 liters of solution. Setting up a ratio and solving for the unknown number of moles identifies 4.8 moles of ethanol per 1 liter of solution. This results in a molarity of 4.8 mol/L, or 4.8 M.
0.25mol / 0.25 L = x mol / 1 L
x=4.8 mol