Using the chemical formula of the compound and the periodic table of elements, we can add up the atomic weights and calculate molecular weight of the substance. Problem 2a: Copper is made up of two isotopes, Cu-63 (62.9296 amu) and Cu-65 (64.9278 amu). The percentage by weight of any atom or group of atoms in a compound can be computed by dividing the total weight of the atom (or group of atoms) in the formula by the formula weight and multiplying by 100. Calculate the isotopic abundances when given the average atomic weight and the isotopic weights. If the formula used in calculating molar mass is the molecular formula, the formula weight computed is the molecular weight. For bulk stoichiometric calculations, we are usually determining molar mass, which may also be called standard atomic weight or average atomic mass. This is not the same as molecular mass, which is the mass of a single molecule of well-defined isotopes. This is how to calculate molar mass (average molecular weight), which is based on isotropically weighted averages. The atomic weights used on this site come from NIST, the National Institute of Standards and Technology. These relative weights computed from the chemical equation are sometimes called equation weights. This site explains how to find molar mass.įormula weights are especially useful in determining the relative weights of reagents and products in a chemical reaction. The reason is that the molar mass of the substance affects the conversion. To complete this calculation, you have to know what substance you are trying to convert. The formula weight is simply the weight in atomic mass units of all the atoms in a given formula.Ī common request on this site is to convert grams to moles. When calculating molecular weight of a chemical compound, it tells us how many grams are in one mole of that substance. Monel is also used in the frames of eyeglasses and even in motion picture film processing.In chemistry, the formula weight is a quantity computed by multiplying the atomic weight (in atomic mass units) of each element in a chemical formula by the number of atoms of that element present in the formula, then adding all of these products together.įinding molar mass starts with units of grams per mole (g/mol). Monel, an alloy of nickel, copper and small amounts of iron, carbon, manganese, silicon, is preferred in aircraft construction, buildings, oil production, piping systems, musical instruments, the chemical industry. Sterling silver, an alloy of silver and copper, is used in forks, spoons, knives, medical instruments, as well as in the manufacture of saxophones. Cuprous sulfide is used in electrodes, solar cells, etc. Cuprous chloride is generally used as a catalyst. Cupric sulfate is mostly used for agricultural purposes. Cuprous oxide is used as a pigment in glasses, porcelain, paints, and ceramics. Copper and its useful alloys are employed in the medical field and in agriculture. Uses of CopperĬopper, a reddish and ductile metallic element with the symbol Cu, is mainly used as a conductor of electricity and heat. Another famous alloy of copper – the one with zinc – is called brass, and it is widely used for producing parts of musical instruments, screws, buttons, door knobs, and many other things. Together with tin, copper forms an alloy named bronze, which is used for producing kitchenware, valves, gears, electrical components, bells, and so on. Besides, copper is extensively used in producing electrical element, especially wires or others. Centuries ago, copper was considered to be a precious metal and was used to produce coins, along with gold and silver. It is possible to find copper in its pure form in nature, but it is usually obtained from natural minerals. Copper is essential for living creatures, and we have it in our bodies in small doses, for proper function of our enzymes. It has got its current name from a Latin word meaning metal from Cyprus. It is known as one of the oldest discovered metals, and humanity worked with copper millions of years ago. Copper is a soft metal resembling gold in its color and texture.
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