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Answered 2013-11-23 17:23:37

If you have the molarity of solution, you can find the moles in a particular set volume by dividing molarity by 1000 and multiplying by the amount of millilitres of the solution that you have. If you have the weight, you divide this by the molecular mass. The weight has to be in grams. The molecular weight is calculated from the periodic table.

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Multiply the number of moles by the molar mass (mass on the periodic table for each element)


You need more information. The subscripts tell the relative number of moles of each element in one mole of that substance. If you know the number of moles of the compound just multiply by the subscript of that element.


number of moles = mass of the element/molar mass of the element



Multiply the number of moles by the molecular weight of the compound (or atomic weight for an element) to find the mass in grams.


Number of moles = Mass of the sample in g/Molar mass in g


There are approximately 4.0 moles of Helium in 16 grams of the element.



Each element has a unique molar mass which is given in grams per mole. So if the amount of the substance in moles is known, then the mass in grams can be found by multiplying them together.



It depends upon what element is.


The number of atoms of an element in a molecule is the number subscript immediately following the element symbol in the formula for the molecule. The number of moles of anything in a compound depends on the amount of the compound, which is not stated.


You can use the formuar mass/moles if you have the mass and the moles of that element or you can as well weigh one mole of an element.


Make sure that the number of moles of each element on the left is equal to the number of moles of the same element on the right.


all you have to do to fine the moles of any element is divide the given grams by the molar mass (which you can find on a periodic table of elements) Likewise, if you need to find the grams, just multiply the number of moles by molar mass. moles = grams/molar mass grams = moles x molar mass your equation should look like this: moles = 89.0 / 17.0 moles = .471


there are 6.022 X 1023 atoms in a mole of any element


The mass of 1 mole of the element is used as a conversion factor to convert grams to moles


No. of moles = Given mass of element or compound/ molar mass of element or compound. Molar mass of Methane(CH4) = 16 g No. of moles of Methane in 345g = 345/16=21.562 moles.


Multiply number of moles by the molecular mass of the element or compound


He = helium 16 grams He (1 mole He/4.003 grams) = 3.99 moles He You can call it 4.0 moles He


You need to provide the element or molecule name in order to determine the number of moles from the mass that you use. To calculate moles from grams from the given information, it's 34g / (g/mol of specific element or molecule) = mol of specific element or molecule.



This isn't a question. Moles are a unit of amount of substance, while lithium is... an element.


1 mole of carbon and 4 moles of hydrogen



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