Form molecular formula using Ca**, HCO,',s,o,':
Cr2022, MnO,- and NO,' and name the
compounds.
Answers
Molecular formulas are a compact chemical notation that describe the type and number of atoms in a single molecule of a compound.
LEARNING OBJECTIVES
Identify the molecular formula of a compound given either its name or structural formula.
KEY TAKEAWAYS
Key Points
A molecular formula consists of the chemical symbols for the constituent elements followed by numeric subscripts describing the number of atoms of each element present in the molecule.
The empirical formula represents the simplest whole-integer ratio of atoms in a compound. The molecular formula for a compound can be the same as or a multiple of the compound’s empirical formula.
Molecular formulas are compact and easy to communicate; however, they lack the information about bonding and atomic arrangement that is provided in a structural formula.
Key Terms
molecular formula: A formula that describes the exact number and type of atoms in a single molecule of a compound.
empirical formula: A formula that indicates the simplest whole number ratio of all the atoms in a molecule.
structural formula: A formula that indicates not only the number of atoms, but also their arrangement in space.
Molecular formulas describe the exact number and type of atoms in a single molecule of a compound. The constituent elements are represented by their chemical symbols, and the number of atoms of each element present in each molecule is shown as a subscript following that element’s symbol. The molecular formula expresses information about the proportions of atoms that constitute a particular chemical compound, using a single line of chemical element symbols and numbers. Sometimes it also includes other symbols, such as parentheses, dashes, brackets, and plus (+) and minus (–) signs.
For organic compounds, carbon and hydrogen are listed as the first elements in the molecular formula, and they are followed by the remaining elements in alphabetical order. For example, for butane, the molecular formula is C4H10. For ionic compounds, the cation precedes the anion in the molecular formula. For example, the molecular formula of sodium fluoride is NaF.
A molecular formula is not a chemical name, and it contains no words. Although a molecular formula may imply certain simple chemical structures, it is not the same as a full chemical structural formula. Molecular formulas are more limiting than chemical names and structural formulas.
Answer:
Casuj sna maze Mno -++++~hssssko-