Class 11 Exam > Class 11 Questions > Formula mass is used for which of the followi...
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Formula mass is used for which of the following substances?
- a)Ionic compounds
- b)Molecules
- c)Atoms
- d)Molecular compounds
Correct answer is option 'A'. Can you explain this answer?
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Verified Answer
Formula mass is used for which of the following substances?a)Ionic com...
Formula mass is used for ionic compounds. Because ionic compounds don't exist as individual molecules hence we take simplest ratio of elements present in that compound so we can't take it as molecular mass. Hence separate name formula mass is given. For example formula mass of NaCl is 23+35.5=58.5
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Formula mass is used for which of the following substances?a)Ionic com...
Formula mass is applicable in the case of ionic compounds. The only reason we use two different terms is because molecules are covalent compound meaning they have only non - metals.
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Formula mass is used for which of the following substances?a)Ionic com...
Formula mass is used for Ionic compounds.
Explanation:
Formula mass is the sum of the atomic masses of all the atoms present in the molecular formula of a compound. It is commonly used to determine the mass of ionic compounds, which are composed of positively charged cations and negatively charged anions. In contrast, molecular compounds consist of atoms that are covalently bonded and do not typically form ions. Therefore, the formula mass is not a useful concept for molecular compounds.
Some examples of ionic compounds and their formula masses are:
- Sodium chloride (NaCl): Na (23.0 amu) + Cl (35.5 amu) = 58.5 amu
- Calcium carbonate (CaCO3): Ca (40.1 amu) + C (12.0 amu) + 3O (16.0 amu) = 100.1 amu
- Magnesium oxide (MgO): Mg (24.3 amu) + O (16.0 amu) = 40.3 amu
In summary, formula mass is used specifically for determining the mass of ionic compounds, which have a distinct molecular formula that can be used to calculate the sum of the atomic masses of all the atoms present.
Explanation:
Formula mass is the sum of the atomic masses of all the atoms present in the molecular formula of a compound. It is commonly used to determine the mass of ionic compounds, which are composed of positively charged cations and negatively charged anions. In contrast, molecular compounds consist of atoms that are covalently bonded and do not typically form ions. Therefore, the formula mass is not a useful concept for molecular compounds.
Some examples of ionic compounds and their formula masses are:
- Sodium chloride (NaCl): Na (23.0 amu) + Cl (35.5 amu) = 58.5 amu
- Calcium carbonate (CaCO3): Ca (40.1 amu) + C (12.0 amu) + 3O (16.0 amu) = 100.1 amu
- Magnesium oxide (MgO): Mg (24.3 amu) + O (16.0 amu) = 40.3 amu
In summary, formula mass is used specifically for determining the mass of ionic compounds, which have a distinct molecular formula that can be used to calculate the sum of the atomic masses of all the atoms present.
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Formula mass is used for which of the following substances?a)Ionic compoundsb)Moleculesc)Atomsd)Molecular compoundsCorrect answer is option 'A'. Can you explain this answer?
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