Calculate the molar mass of the substance.Determine how many moles are given in the problem.Mole Conversions: Converting moles to grams Three steps to converting moles of a substance to grams:
![periodic table molar mass units periodic table molar mass units](https://image2.slideserve.com/4667824/molar-masses1-l.jpg)
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But it is possible to determine the mass of large amounts of them using a balance. Counting atoms or molecules is very difficult since they are so small.Carbon-12 is defined as weighing exactly 12 u per atom. The old symbol was amu, while the symbol "u" is now used. An atomic mass unit is defined as 1/12 the mass of the carbon-12 isotope.It is more commonly referred to as molecular weight and abbreviated as MW.
![periodic table molar mass units periodic table molar mass units](https://study.com/cimages/multimages/16/bloque_d_y_p_-_copia489097702783897242.png)
The molecular mass of a substance is the mass in atomic mass units (amu) of all the atoms in a given molecule.