Molecular Mass

How do you determine the gram mass of an element in a molecule if you know the gram mass for the molecule and its molecular weight?

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First, weigh the compound. Get the chemical formula, so that you can determine how many atoms of each element are present in the molecule. Look up the gram molecular weight of each element in that compound, using the periodic table of elements. You can then put that information together to get the gram molecular weight of the molecule in question. Then divide the weight of the compound that you have, by the gram molecular weight, and the result is the number of moles.

The periodic table of elements gives a gram molecular weight for each element, which tells you the number of grams that a mole of that element weighs. So, for an element you can look up that answer immediately; for a compound, you just determine the gram molecular weight of each element that is present in that compound, and multiply by the number of atoms of that element per molecule. Note that the weight of an element is NOT simply determined by the atomic weight. Atomic weight only applies to a specific isotope, but elements as they are found in nature are always a mixture of isotopes. So, the gram molecular weight tells you what the element actually weighs, based upon the normal isotope distribution.

Using a periodic table, find the elements in the molecule you are trying to weigh, for example in NaO you would need to find sodium (Na) and oxygen (O). Then find the weight for those elements under (or above on some tables) the element symbol (the letter(s)). Multiply the weight by the number of the element, which is shown by the small number to the right and below the symbol on the molecular formula. Add all the elements together after you have multiplied each separate element with its number and weight, and you will have the molecular weight.

If you understand what molecular weight (MW or FW) means, then look at the molecular weight of one molecule of mercury (Hg2) and compare that to the molecular weight of an H2O molecule.Which is heavier?

You add together the atomic weights of all the atoms (as given by its chemical formula) in the molecule

No. Molecular weight is the "weight" of one molecule, Mass is the total "weight" of an object.

The molecular weight of an element is already in grams.

The formula weight of a molecule is determined by the elements that make up the molecule. For example, if you have H20, the weight of the molecule will be determined by multiplying the number of hydrogens (2) times the weight of the hydrogen element (1.008 grams) so this would equal 2.016 grams. Now the weight of one oxygen is 16 grams. Add the two together and you have your formula weight of the molecule equal to 18.016 grams. Basically, you break everything down into it's elemental form and determine the weights of each individual element and then multiply it by the number of each element in your molecule.

The molecular weight is the sum of the atomic weights of all the atoms contained in the molecule.

molecule having high molecular weight is called macromolecule while a molecule having low molecular weight is called micromolecule

a small molecule which has molecular weight less than 10,000dalton or the molecules which have low molecular weight are known as micromolecules

The concentration is related to the volume of the atmosphere and the amount of the element your looking at.Molarity(concentration)= G/(Molecular weight)x Liters(volume)

The term "salen ligand" actually refers to a class of compounds with a specific structure that allows them to form complexes with metals and anions. To determine the salen ligand's (or any other compound's) molecular weight, it is necessary to know the number and type of atoms in the molecule. Multiply the number of atoms of each element by their corresponding molecular weights (which can be referenced on a periodic table), and then add these values together. This yields the molecular weight of the compound.

the molecular weight of HCL is 36.5(multiply the no. of atoms of the element with the atomic weight &amp; add it with the other element)i.e;HCL=(1*1)+(35.5*1)=36.5

The mentioned name is the name of an organism, not a molecule or compound. It therefore has no specific molecular weight since it is not a chemical

The molecular weight of oxalic acid is 90.0349 grams per molecule.

With two carbon atoms at 6 and six hydrogen atoms at 1, the relative molecular weight of ethane is 30.

The structural information you get from molecular weight is how much the molecule weighs. It is the first step in assembling the structural information.

150 kDa Considering that the average molecular weight of an antibody molecule is approximately 150,000 Dalton, ... Padlan EA. Anatomy of the antibody molecule. Mol. Immunol. 1994;31:169-217.

Multiply the # of grams by the element's atomic weight. Or if dealing with milliliters, multiply the volume by solutions molarity. When calculating a molecule's # of moles, multiply the # of grams by the molecular weight.

You find out how much the molecule weighs when you use molecular weight determination. It is the first step in assembling the structural information.

Simply looking at the expressions that derive weight average and number average one can see that the weight average is a second order expression where number average is a first order. To put it more simply: weight averaged molecular weight emphasizes heavy molecules more than light ones; number averaged molecular weight says a molecule is a molecule and counts them both equally.

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