Calculate the number of moles of solute present in 450. g of an aqueous NaCl solution that is 0.565 % NaCl by weight
.00565*450 = 2.54g of NaCl
So, how many moles is that?
4.35*10^-2
To calculate the number of moles of solute present in a solution, you need to follow these steps:
1. Determine the molar mass of the solute: In this case, the solute is NaCl (sodium chloride). The molar mass of NaCl is the sum of the atomic masses of sodium (Na) and chlorine (Cl):
Molar mass of NaCl = (molar mass of Na) + (molar mass of Cl)
The atomic masses can be found on the periodic table. The molar mass of Na is around 22.99 g/mol, and the molar mass of Cl is around 35.45 g/mol.
2. Convert the percentage of NaCl by weight to grams:
The solution is 0.565% NaCl by weight, so the mass of NaCl present in 100 g (since it's a percentage by weight) of the solution will be:
Mass of NaCl = (0.565/100) × 100 g = 0.565 g
3. Calculate the number of moles of NaCl:
The number of moles can be calculated using the formula:
Moles = Mass / Molar mass
Moles of NaCl = Mass of NaCl / Molar mass of NaCl
Now, let's proceed with the calculation:
1. Molar mass of NaCl = 22.99 g/mol + 35.45 g/mol = 58.44 g/mol
2. Mass of NaCl = 0.565 g
3. Moles of NaCl = 0.565 g / 58.44 g/mol = 0.00968 mol (rounded to 5 decimal places)
Therefore, there are approximately 0.00968 moles of NaCl in 450 g of the solution.