Explanation:
impurities affect both melting point and boiling point
in the case of melting point it lowers the melting point
so I guess one of the samples Ie contained impurities
Explanation:
MWQ means the minimum weighable quantity.
Mathematically, MWQ = 
or, MWQ = 
It is given that sensitivity is 4.5 mg and maximum permitted error is 3.6%.
Therefore, fraction error =
= 0.036
Hence, we will calculate MWQ as follows.
MWQ = 
= 
= 125 mg
Thus, we can conclude that the MWQ of the given balance is 125 mg.