50.4g CaBr2 to moles
To convert grams of a substance to moles, you need to know the molar mass of the substance. In this case, the molar mass of CaBr2 (calcium bromide) can be determined by adding the atomic masses of each element:
Ca (calcium) has an atomic mass of 40.08 g/mol, and Br (bromine) has an atomic mass of 79.90 g/mol. Since there are two bromine atoms in CaBr2, we multiply the atomic mass of bromine by 2.
Molar mass of CaBr2 = 40.08 g/mol + (79.90 g/mol x 2) = 40.08 g/mol + 159.80 g/mol = 199.88 g/mol
Now that we know the molar mass of CaBr2 is 199.88 g/mol, we can use it to convert grams to moles. Divide the mass of the substance (50.4 g) by the molar mass (199.88 g/mol):
moles = mass / molar mass
moles of CaBr2 = 50.4 g / 199.88 g/mol
Calculating this, we find:
moles of CaBr2 ≈ 0.252 moles