For example, one mole of oxygen is 15.999 grams, one mole of hydrogen has a mass of 1.01 grams, one mole of carbon has a mass of 12.02 grams, and so on. It is easy to convert moles to grams when dealing in mole measurements.Ī mole can be used to measure anything, but one mole of a substance is the equivalent of the atomic mass number of that substance in grams. Atomic mass units were defined based on the masses of protons and neutrons by determining that one carbon atom has only six protons and usually six neutrons in its nucleus and therefore should be. A mole is most useful when dealing with chemical reactions because it keeps chemicals in proportion with their chemical equations while eliminating ridiculously large or small numbers. A mole is actually a proportionality constant scientifically defined by Avogadro's constant (6.022x10^23). It is actually 6.022x10^23 molecules of water. A mole of water is much more than one molecule of water. Your value gets instantly converted to all other units on the page. 2: Enter the value you want to convert (atomic mass unit). You can also go to the universal conversion page. To switch the unit simply find the one you want on the page and click it. Why do some people refer to the atomic mass of an element as the atomic mass average? Also how would I calculate the molecular weight of a fraction of a mole of a chemical compound, say 0.63 moles of methane?Ī mole of a substance is a bit more complicated than explained. This is a conversion chart for atomic mass unit (Metric). The isotopic mass usually differs for other isotopes. For 12 C, the atomic mass is exactly 12u since the atomic mass unit is defined from it. An atom of sulfur-32 has a mass of 31.972 amu. For example, one atom of helium-4 has a mass of 4.0026 amu. The mass of any isotope of any element is expressed in relation to the carbon-12 standard. One unified atomic mass unit is approximately the mass of one nucleon (either a single proton or neutron) and is numerically equivalent to 1 g/mol. An atomic mass unit is defined as a mass equal to one twelfth the mass of an atom of carbon-12. In this case, 0.63 moles of methane is equal to 10.12grams of methane when rounded to four significant figures. One atomic mass unit is equal: 1u 1.66 x 10 -24 grams. You can simply multiply this number by the number of moles of methane you need to determine how many grams of methane you need.

This tells you that for every mole of methane there are 16.06 grams of methane. An atomic mass unit, or AMU, is a physical constant in chemistry equal to one-twelfth of the mass of an unbound carbon-12 atom. Your example methane has an atomic mass of 16.06 g/mol. SynonymsEdit dalton unified atomic mass unit.

These isotopes all have different atomic masses, so when an atomic mass is given for an element, it is a proportional average of the different isotopes.Īs for determining the mass of a number of moles of a compound, there are a couple of easy steps to follow. An atomic mass unit is a unit of mass used to express the weight subatomic particles, where one unit is equal to exactly one-twelfth the mass of a carbon-12. (chemistry) A unit of mass equal to 1/12 the mass of an atom of the 12C isotope of carbon. The atomic mass of an element is actually proportional average of all the different naturally occurring isotopes of an element.