What is the molar mass of Al 2 (SO 4 ) 3 ? 150.03 g/mol 278.03 g/mol 342.17 g/mol 450.09 g/mol

Hey everyone. Let's go ahead and practice calculating our molar masses and specifically for magnesium phosphate. So we're going to take each element. So starting off with magnesium and multiplying the number of moles by its atomic mass. So we have three magnesium And we're going to multiply this by its atomic mass of 24.31 g per mole, which we can find in our periodic table. And so we end up with 72.93 g per mole and we have phosphate. So we're going to take each element within the parentheses. So we have phosphorus and we have two of phosphorus since we have that to written outside of our phosphate. And we're going to multiply this by its atomic mass of 30. g per mole. This will get us to a value of 61.94. And lastly looking at oxygen, we have eight of oxygen since four times two is eight. And we're going to multiply this by its atomic mass of 16 point oh, Which will get us a value of 128 g per mole. Taking the sum of all of these. We end up with a molar mass of 262 . g per mole. So this is the molar mass for a magnesium phosphate. So I hope that made sense. And let us know if you have any questions