How would I calculate this? I have the answer because its from a previous test I just want to know how I would calculate it.
How many grams of NaCI are contained in 350. mL of a 0.133 M solution of sodium chloride?
mols = grams/molar mass. You have molar mass and M, solve for grams.
To calculate the number of grams of NaCl contained in a given volume of a solution, you would follow these steps:
Step 1: Determine the molar mass of NaCl.
The molar mass of NaCl is calculated by adding the atomic masses of sodium (Na) and chlorine (Cl) together. The atomic mass of sodium is 22.99 g/mol, and the atomic mass of chlorine is 35.45 g/mol. So, the molar mass of NaCl is 22.99 g/mol + 35.45 g/mol = 58.44 g/mol.
Step 2: Calculate the number of moles of NaCl.
To do this, you can use the formula:
moles = concentration (in M) × volume (in L)
Given:
Concentration (M) = 0.133 M
Volume (L) = 350 mL = 0.350 L
Substituting the values into the formula:
moles = 0.133 M × 0.350 L
Step 3: Convert moles to grams.
Multiply the number of moles of NaCl by the molar mass of NaCl calculated in Step 1 to convert from moles to grams:
grams = moles × molar mass
Substituting the values into the formula:
grams = (0.133 M × 0.350 L) × 58.44 g/mol
Now you can calculate the answer using a calculator:
grams = 2.309 g
Thus, there are approximately 2.309 grams of NaCl contained in 350 mL of a 0.133 M solution of sodium chloride.