There are 140 g of H2SO4 in 400 mL of a solution. What is the molarity?
Molarity is moles/Liter. First you need to convert 140g to moles. After you do that, you divide your answer by .400L to get your molarity.
150g of H2SO4 is 1.53moles of H2SO4.
c= 1.53 moles / 1liter = 1.53M
To find the molarity of a solution, you need to know the number of moles of solute (in this case, H2SO4) and the volume of the solution. Here's how you can calculate the molarity:
Step 1: Convert grams to moles
To find the number of moles of H2SO4, you need to divide the given mass by its molar mass. The molar mass of H2SO4 is calculated by adding up the atomic masses of its elements.
Molar mass of H = 1.01 g/mol (hydrogen)
Molar mass of S = 32.06 g/mol (sulfur)
Molar mass of O = 16.00 g/mol (oxygen) x 4 (since there are four oxygen atoms in H2SO4)
Molar mass of H2SO4 = (2 * 1.01 g/mol) + 32.06 g/mol + (4 * 16.00 g/mol) = 98.09 g/mol
Now, you can convert grams of H2SO4 to moles:
Moles of H2SO4 = (140 g) / (98.09 g/mol)
Step 2: Convert milliliters to liters
You need the volume of the solution in liters to find the molarity. Since 1 liter is equivalent to 1000 milliliters, you can convert as follows:
Volume in liters = (400 mL) / (1000 mL/L)
Step 3: Calculate molarity
Molarity (M) is defined as the number of moles of solute divided by the volume of the solution in liters. Putting it all together:
Molarity (M) = (moles of H2SO4) / (volume in liters)
Now, you can substitute the values to calculate the molarity.