what is the difference between formula unit and molecular formula?
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1 Answer. A molecule is composed of two or more elements that are covalently bonded. A formula unit indicates the lowest whole number ratio of ions in an ionic compound.
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A chemical formula is a notation used by scientists to show the number and type of atoms present in a molecule, using the atomic symbols and numerical subscripts. A chemical formula is a simple representation, in writing, of a three dimensional molecule that exists.
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The molecular formula is the actual whole number ratio between the elements in the compound. EXAMPLE: A compound with a molecular mass of 180.18 u contains 40.00% carbon, 6.72% hydrogen, and 53.28% oxygen.
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The simplest whole-number ratio of atoms of each element present in a compound. Molecular formula. The actual number of atoms of each element in a molecule.
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The molecular formula for ammonia is NH3 . In a molecular formula, the subscript for each element indicates the number of atoms of each element. When there is no subscript written, it is understood to be 1. In one molecule of NH3 , there is 1 atom of N and 3 atoms of H , for a total of 4 atoms.
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The different types of chemical formulas all show the elements present as well as the ratio of the elements present in a chemical compound. ... The molecular formula tells us the actual number of atoms for each element that is present in a compound.
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9 Answers. BRIAN M. The empirical formula represents the ratio of atoms in a molecule in lowest terms, while the molecular formula is the actual atom number in the molecule.
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The empirical formula is CH2O since there are no common factors (other than 1) in the subscripts. CH2O is the molecular formula because the subscripts give the actual number of atoms of each element in the molecule.
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The composition of the unit cell is therefore Na4Cl4. Since the number of formula units per unit cell is 4, the formula of the compound is NaCl. For compounds in which the building blocks of the crystal structure are molecules, the procedure is essentially the same.
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A molecule refers to two or more elements that are covalently-bonded together. For example, in one mole of H2O there would be 6.022 x 10^23 molecules of H2O. A formula unit refers to the lowest whole number ratio (like an empirical formula) of a compound with an ionic bond.
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Molecular formulas tell you how many atoms of each element are in a compound, and empirical formulas tell you the simplest or most reduced ratio of elements in a compound. ... Also, many compounds with different molecular formula have the same empirical formula.
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In chemistry, the empirical formula of a chemical compound is the simplest positive integer ratio of atoms present in a compound. ... The molecular formula, on the other hand, shows the number of each type of atom in a molecule. The structural formula shows the arrangement of the molecule.
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There are three main types of chemical formulas: empirical, molecular and structural. Empirical formulas show the simplest whole-number ratio of atoms in a compound, molecular formulas show the number of each type of atom in a molecule, and structural formulas show how the atoms in a molecule are bonded to each other.
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Molecular formulas give the kind and number of atoms of each element present in a molecular compound. In many cases, the molecular formula is the same as the empirical formula. The molecular formula of methane is CH4 and because it contains only one carbon atom, that is also its empirical formula.
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The empirical formula is by definition the simplest whole number ratio defining constituent atoms in a species. The molecular formula is always a whole number ratio of the empirical formula. Molecular formula = (Empirical formula)×n .
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A molecular formula is a representation of a molecule that uses chemical symbols to indicate the types of atoms followed by subscripts to show the number of atoms of each type in the molecule. (A subscript is used only when more than one atom of a given type is present.)
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Molecular formulas contain no information about the arrangement of atoms. Because of this, one molecular formula can describe a number of different chemical structures. A structural formula is used to indicate not only the number of atoms, but also their arrangement in space.