Q&A for How to Calculate Molecular Weight

The molecular mass of Phosphorus is 30.974 to 3 decimal places, commonly written as 31 on the periodic table.

Hydrogen has a low electronegativity, and thus is easily taken out of bonds.

44.01 g/mol. C has a molecular mass of 12.01. O has a molecular mass of 16. Therefore, the formula would be 12.01 + 2(16), which gives you the molecular mass 44.01 g/mol.

First, write out the formula for tricalcium phosphate which is Ca3(PO4)2. Using the molecular masses of each component of the formula we get an equation that looks like this. X = 3(40.078) + 2(30.974 + 4(16)). Simplified we get X=120.234 + 2(94.974). Further simplification gives us 120.234 + 189.948. So therefore X = 310.182. So the molecular weight of tricalcium phosphate is 310.182 u.

Unfortunately, this question is almost impossible to answer. The problem here is that olive oil is not a single compound with a defined molecular structure, but a mixture of many different fatty acids and esters (mainly oleic acid, but also linoleic acid, palmitic acid and a few others). You could add the molecular masses of these compounds together, but in order to do that, you need to know the exact composition of the oil and the abundances of the different substances. There is no straight answer, because the composition varies by cultivar, region, altitude, time of harvest, and extraction process.

You need to reasearch the molecular weights first and then add them together, while also taking the abundance into account. Don't forget to convert the percentage into a ratio < 1 by dividing by 100. For example, take a mixture of 20% ethanol (46 g/mol), 41% methanol (32 g/mol) and 39% water (18 g/mol): The calculation would look like this: 0,20*46 g/mol + 0,41*32 g/mol + 0,39*18 g/mol = 29 g/mol (rounded to significant figures).