Suppose you wanted to dissolve 106g of Na2CO3 in enough H2O to make 6.00 L of solution.
A. What is the molar mass of Na2CO3?
B. What is the morality of this solution?
for the molar mass of Na2Co3 i got:
Na2= 22.98 (2)= 45.96
CO2=12.01 (3)=+36.03
equals: 81.99---->82
Thanks
To find the molar mass of Na2CO3 (sodium carbonate), you need to calculate the sum of the atomic masses of each element in the compound.
A. Molar mass of Na2CO3:
The molar mass of an element or a compound is the sum of the atomic masses of each atom in the formula. Here's how you can calculate it:
1. Look up the atomic masses of each element in the compound. The atomic mass of sodium (Na) is 22.99 g/mol, carbon (C) is 12.01 g/mol, and oxygen (O) is 16.00 g/mol.
2. Determine the number of atoms of each element in the compound. In Na2CO3, there are two atoms of sodium (Na), one atom of carbon (C), and three atoms of oxygen (O).
3. Multiply the atomic mass of each element by the number of atoms present in the compound.
(2 × atomic mass of Na) + atomic mass of C + (3 × atomic mass of O)
= (2 × 22.99 g/mol) + 12.01 g/mol + (3 × 16.00 g/mol)
= 45.98 g/mol + 12.01 g/mol + 48.00 g/mol
= 105.99 g/mol
The molar mass of Na2CO3 is 105.99 g/mol.
B. Molarity of the solution:
Molarity (M) is the amount of solute (in moles) divided by the volume of the solution (in liters). To find the molarity of the Na2CO3 solution, you need to calculate the number of moles of Na2CO3 and divide it by the volume of the solution.
1. Calculate the number of moles of Na2CO3 using the formula:
moles = mass / molar mass
= 106g / 105.99 g/mol
= 1.00 mol
2. Divide the number of moles by the volume of the solution in liters:
Molarity (M) = moles / volume
Molarity = 1.00 mol / 6.00 L
Molarity = 0.17 M
The molarity of the Na2CO3 solution is 0.17 M.
A. Molar mass Na2CO3 can be looked up can't it? Surely I don't need to add those atomic masses for you.
B. I don't know about the morals of this solution; however, the molarity = moles/L.
Don't remember how to convert grams to moles? moles = grams/molar mass Na2CO3.