calculate the equivalent weight of acid on the basis of given reaction. NaoH + H2So4 gives NaHSo4 + H20.

98

Explanation:

Based on the reaction:

NaOH + H2SO4 → NaHSO4 + H2O

Where 1 mole of the base (NaOH) reacts per mole of the acid (H2SO4)

The formula of equivalent weight is:

Equivalent weight = Molecular mass / Number of equivalent moles

Where Molecular mass of sulfuric acid is 98g/mol

And number of equivalent moles = 1 -Because 1 mole of acid reacts per mole of base

Equivalent weight is:

98 / 1 =

98

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.