how do you calculate molar concentration for 1.50g NaCl in 100.00mL of solution?
Chemistry is your subject, not college. Putting your subject will get a quicker response most of the time.
moles = grams NaCl/molar mass NaCl.
Then M = moles/0.1 L
To calculate the molar concentration (also called molarity), you need to know the amount of solute (in moles) and the volume of the solution (in liters).
Step 1: Convert the given mass of NaCl (1.50g) into moles.
To do this, you need to know the molar mass of NaCl. The molar mass of NaCl is the sum of the atomic masses of sodium (Na) and chlorine (Cl).
Na: Atomic mass = 22.99 g/mol
Cl: Atomic mass = 35.45 g/mol
So, molar mass of NaCl = 22.99 g/mol + 35.45 g/mol = 58.44 g/mol
Now, use the formula:
moles = mass / molar mass
moles of NaCl = 1.50g / 58.44 g/mol
Step 2: Convert the given volume of the solution (100.00 mL) into liters by dividing by 1000.
volume (in liters) = 100.00 mL / 1000 = 0.100 L
Step 3: Use the formula for molarity:
Molarity (M) = moles of solute / volume of solution (in L)
Molarity = moles of NaCl / volume
Molarity = moles of NaCl / 0.100 L
Now you can substitute the values:
Molarity = moles of NaCl / 0.100 L
Molarity = (1.50 g / 58.44 g/mol) / 0.100 L
Molarity ≈ 0.2575 mol/L (rounded to four decimal places)
Therefore, the molar concentration of the NaCl solution is approximately 0.2575 mol/L.