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The molecular formula is the formula of a discrete (single) molecule of the substance.
The formula unit is generally defined in the same way as the empirical formula, which is the simplest whole number ratio of the elements
Chemical formula includes both molecular and formula units.
Examples:-
Benzene a molecule consisting of a ring of 6 carbon atoms each with a hydrogen attached:-
- molecular formula C6H6
- formula unit CH (which is the result you would get if you analysed the compound and worked out the atomic ratio of carbon to hydrogen.
NaCl is ionic so you cannot write a molecular formula you express the compound simply as the formula unit (empirical formula)- in its simplest case NaCl (never Na2Cl2 or some such)
How can you tell whether a formula is molecular formula or a formula unit. Well if the formula could be "simplified" like benzene C6H6 could be simplified to CH then you know its a molecular formula. Something like SO2 and TiO2, well you need to be told. (SO2 is molecular, TiO2 is ionic)
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Is Na Br a molecular formula or a formula unit?
NaBr would be a formula unit as all sodium (Na) compounds are ionic.
Why is it that only molecular compounds can have a molecular formula?
Because there are no compounds that aren't molecules/molecular. The question as posed is nonsense. Rephrase?
Is CCI4 a molecular formula or formula unit?
CCl4 is molecular formula.
Would ionic or covalent molecules use the molecular formula or empirical formula?
What you write for an ionic compound is called the formula unit, but the formula unit is almost always the same as the empirical formula. The answer to your question could not be the molecular formula because an ionic compound is not a molecule.
Explain why the percent composition of certain compounds are not sufficient to determine the compounds molecular formulas?
Because unlike the empirical formula, the molecular formula does not have to be the simplest ratio.If by chance you are given the percent composition of the elements in a substance, you could calculate the empirical formula and then the empirical formula's mass. However, the molecular formula equation is molecular formula= (empirical formula)n, where n is the mass of the molecular formula divided by the mass of the empirical formula. You would, therefore, need to know the mass belonging to the molecular formula, which you are not given.
Is Na Br a molecular formula or a formula unit?
NaBr would be a formula unit as all sodium (Na) compounds are ionic.
What is salts molecular?
For ionic compounds the correct term is formula unit, not molecule.
Is K2Cr2O7 a formula unit or molecules?
Yes, potassium sulfide is a molecular compound.
Is H2O a molecular formula or formula unit?
a molecular formula
Is Cacl2 a molecular formula or formula unit?
a formula unit
The term formula mass can be applied to ionic compound and molecular compuonds because?
The term formula mass is generally defined as the mass of a unit cell in an ionic compound. Molecular compounds are just defined in terms of molecular mass.
Why is it that only molecular compounds can have a molecular formula?
Because there are no compounds that aren't molecules/molecular. The question as posed is nonsense. Rephrase?
Molecular formula for potassium chloride?
Since potassium iodide is ionically bonded, it does not technically have a molecular formula. The corresponding characteristic for ionically bonded compounds is a "formula unit", and for potassium iodide, this is KI
Is CCI4 a molecular formula or formula unit?
CCl4 is molecular formula.
What is more useful for determining a compounds identity Empirical formulaPercent compositionOR Molecular formula?
molecular formula
What is the term for compounds that have the same molecular formula but a different molecular shape?
Isomers.
Why ionic compounds do not posses molecular formula?
it is not a molecule
