Calculate the number of moles and number of grams of solute in 250 mL of a 0.10M CaCl2.
18.2
To calculate the number of moles and number of grams of solute in a solution, we will use the equation:
moles = concentration (M) × volume (L)
Given:
Concentration (M) = 0.10M
Volume (L) = 250 mL
First, let's convert the volume from milliliters (mL) to liters (L):
250 mL = 250/1000 L = 0.25 L
Now, we can calculate the number of moles of solute:
moles = 0.10M × 0.25 L
moles = 0.025 moles
To calculate the number of grams of solute, we need to use the molecular weight of CaCl2. The molecular weight of CaCl2 is:
Ca = 40.08 g/mol
Cl = 35.45 g/mol (x2 since there are two chloride ions in CaCl2)
Molecular weight (CaCl2) = (40.08 g/mol) + (35.45 g/mol × 2)
Molecular weight (CaCl2) = 40.08 g/mol + 70.90 g/mol
Molecular weight (CaCl2) = 110.98 g/mol
Now, we can calculate the number of grams of solute:
grams = moles × molecular weight (CaCl2)
grams = 0.025 moles × 110.98 g/mol
grams = 2.75 grams
Therefore, there are 0.025 moles and 2.75 grams of CaCl2 in 250 mL of a 0.10M solution.
To calculate the number of moles and number of grams of solute in a solution, we need to use the formula:
moles = concentration × volume
First, let's calculate the number of moles of CaCl2 in 250 mL of a 0.10 M solution.
Step 1: Convert the volume from milliliters (mL) to liters (L).
250 mL ÷ 1000 = 0.250 L (since there are 1000 mL in 1 L)
Step 2: Use the formula to calculate the moles of CaCl2.
moles = concentration × volume
moles = 0.10 M × 0.250 L
moles = 0.025 mol
Therefore, there are 0.025 moles of CaCl2 in 250 mL of a 0.10 M solution.
Now, to calculate the number of grams of CaCl2, we need to use the molar mass of CaCl2.
Step 3: Calculate the molar mass of CaCl2.
Ca: atomic mass = 40.08 g/mol
Cl: atomic mass = 35.45 g/mol (x2 since there are two Cl atoms in CaCl2)
Molar mass of CaCl2 = 40.08 g/mol + (35.45 g/mol × 2)
Molar mass of CaCl2 = 40.08 g/mol + 70.90 g/mol
Molar mass of CaCl2 = 110.98 g/mol
Step 4: Calculate the grams of CaCl2 using the moles obtained earlier.
grams = moles × molar mass
grams = 0.025 mol × 110.98 g/mol
grams = 2.77 g
Therefore, there are 0.025 moles and 2.77 grams of CaCl2 in 250 mL of a 0.10 M solution.
0.10 M means 0.10 mols/liter.
So if you have 0.1 mols in 1000 mL, how many mols will you have in 250 mL?
grams = mols x molar mass.