![]() In the laboratory, for example, the masses of compounds and elements used by chemists typically range from milligrams to grams, while in industry, chemicals are bought and sold in kilograms and tons. Because the masses of individual atoms are so minuscule (on the order of 10 −23 g/atom), chemists do not measure the mass of individual atoms or molecules. The problem for Dalton and other early chemists was to discover the quantitative relationship between the number of atoms in a chemical substance and its mass. We also described the law of multiple proportions, which states that the ratios of the masses of elements that form a series of compounds are small whole numbers. In Dalton’s theory each chemical compound has a particular combination of atoms and that the ratios of the numbers of atoms of the elements present are usually small whole numbers. ![]() The same calculation can also be done in a tabular format, which is especially helpful for more complex molecules: Molecular weight of Copper(II) Sulfate Pentahydrate (CuSO 4.\right ) \right ] \) So the molecular weight of Copper(II) Sulfate Pentahydrate is 249.6866.Ĭopper(II) Sulfate Pentahydrate Molecular Weight Calculation Molecular weight of Copper(II) Sulfate Pentahydrate (CuSO 4.5H 2O) Step 4: Calculate the molecular weight of Copper(II) Sulfate Pentahydrate by adding up the total weight of all atoms. Total weight of water in Potassium antimonyl tartrate trihydrate: 18.0154 x 5 = 90.077 Number of water (H 2O) molecules in Potassium antimonyl tartrate trihydrate: 5 ![]() Total weight of Oxygen atoms in Copper(II) Sulfate Pentahydrate: 15.9994 x 4 = 63.9976 Number of Oxygen (O) atoms in Copper(II) Sulfate Pentahydrate: 4 Total weight of Sulfur atoms in Copper(II) Sulfate Pentahydrate: 32.066 x 1 = 32.066 Number of Sulfur (S) atoms in Copper(II) Sulfate Pentahydrate: 1 Total weight of Copper atoms in Copper(II) Sulfate Pentahydrate: 63.546 x 1 = 63.546 Number of Copper atoms in Copper(II) Sulfate Pentahydrate: 1 Step 3: Calculate the molecular weight of Copper(II) Sulfate Pentahydrate by adding the total weight of all atoms. Step 2: Find out the atomic weights of each atom (from the periodic table).Ītomic weight of Copper (Cu) : 63.546 (Ref: Jlab-ele029)Ītomic weight of Sulfur (S) : 32.066 (Ref: Jlab-ele016)Ītomic weight of Oxygen (O): 15.9994 (Ref: Jlab-ele008) ![]() From the chemical formula, you can find that one molecule of Copper(II) Sulfate Pentahydrate has one Copper (Cu) atom, one Sulfur (S) atom, four Oxygen (O) atoms, and five water molecules. The chemical formula of Copper(II) Sulfate Pentahydrate is CuSO 4.5H 2O. You will know different atoms and their number in a Copper(II) Sulfate Pentahydrate molecule from the chemical formula. Step 1: Find out the chemical formula and determine constituent atoms and their number in a Copper(II) Sulfate Pentahydrate molecule. CALCULATION PROCEDURE: Copper(II) Sulfate Pentahydrate Molecular Weight Calculation The molecular weight of Copper(II) Sulfate Pentahydrate is 249.6866 which can be calculated by adding up the total weight (atomic weight multiplied by their number) of all its elements and water molecules. The Pentahydrate form of Copper(II) Sulfate (CuSO 4.5H 2O, also known as Blue Vitriol) also contains 5 water molecules. The molecular weight of Copper(II) Sulfate Pentahydrate (CuSO 4.5H 2O) is 249.6866.Ĭopper(II) Sulfate (CuSO 4) is an inorganic compound of three elements: Copper, Sulfur, and Oxygen. ![]()
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