![]() ![]() Sometimes, you may need to save time and solve the problem using a shortcut. The molar mass of sulfur is 32.1 g/mol, and therefore, the conversion factors are: So, to calculate the moles from a given mass, we make a conversion factor correlating 1 mole with the molar of the given component.įor example, how many moles of sulfur are there in a 16.2 g sample? The molar mass, on the other hand, is a constant number for a given atom or a molecule as it is for a specific amount of it. The given mass is the mass of the sample, and it can be any number, for example, we can have 10 g of salt, 15 g, or 100 g. To calculate the moles from a given mass (m), the molar mass of the component is used. And we can do this for all the elements in the periodic table. For potassium then, it is 39.098 g/mol which means one mole of potassium atoms weighs 39.098 g. What’s important for today’s topic is that numerically, the molar mass is equal to the average atomic mass of the given atom, so we can look it up in the periodic table. The smaller one is the atomic number which shows the number of protons, and the larger one is the average atomic mass: So, how do we find the molar mass in the periodic table?įor example, there are two numbers given for potassium in the periodic table: 19 and 39.098. To calculate it we are always going to need a periodic table. Remember, molar mass ( M ) is the mass of one mole of atoms/molecules/ions expressed in g/mol. ![]() To convert the grams to moles, we need to know the molar mass of the substance. ![]()
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