How many moles of copper sulfate, CuSO4 are in a o.671 g sample?
How do I start on this?
mols = grams/molar mass by formula OR if you want to do it with dimensional analysis it is
0.671 g CuSO4 x (1 mol CuSO4/159 g CuSO4) = ?? Note how the g CuSO4 cancel ( the unit we don't want to keep) and leaves the mol CuSO4 (the unit we want to keep and the unit to which we are trying to convert). The 159 is an estimate of the molar mass of CuSO4. You will need to look it up to work the problem exactly.
To determine the number of moles of copper sulfate in a given sample, you need to use the formula:
moles = mass / molar mass
To start, you should find the molar mass of copper sulfate, CuSO4. This can be done by adding up the atomic masses of each element in the chemical formula.
Copper (Cu) has an atomic mass of approximately 63.55 g/mol.
Sulfur (S) has an atomic mass of approximately 32.07 g/mol.
Oxygen (O) has an atomic mass of approximately 16.00 g/mol.
To find the molar mass of CuSO4, multiply the atomic mass of each element by the number of atoms present in the formula and then add them together:
Molar mass of CuSO4 = (1 * Cu) + (1 * S) + (4 * O)
Once you have calculated the molar mass, you can then substitute it along with the given mass (0.671 g) into the formula:
moles = 0.671 g / molar mass
By dividing the mass of the sample by the molar mass of copper sulfate, you'll obtain the number of moles of copper sulfate present in the sample.