SCIENCE
CHEMISTRY
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
Formula mass
|
|
|
Molecular mass
|
|
|
Either A or B
|
|
|
None of the above
|
Detailed explanation-1: -Formula unit mass is the term used for mass of ionic compounds. Similarly, molecular mass is used for mass of covalent compounds (molecules).
Detailed explanation-2: -The formula mass for an ionic compound is calculated in the same way as the formula mass for covalent compounds: by summing the average atomic masses of all the atoms in the compound’s formula.
Detailed explanation-3: -The ionic compounds are not molecules, so we don’t find the molecular mass for an ionic compound, so we name it the formula mass in the case of ionic compounds.
Detailed explanation-4: -Chemical formulas for ionic compounds are called ionic formulas. A proper ionic formula has a cation and an anion in it; an ionic compound is never formed between two cations only or two anions only. The key to writing proper ionic formulas is simple: the total positive charge must balance the total negative charge.
Detailed explanation-5: -The formula unit mass is applicable for ionic compounds such as Sodium chloride. It is used for stoichiometric measurements of any ionic/covalent network solid compound.