An aqueous solution that is 50.0 percent sulfuric acid (h2so4) by mass has a density of 1.143 g/ml. determine the molality of the solution.

Molality is defined as the ratio of number of moles of solute to the mass of solvent in kilograms.

The formula of molality is:

  - (1)

The formula of density is:

  -  (2)

Consider,

Rearranging the formula (2):

Substituting the values:

Since, the aqueous solution is 50% by mass that is:

Rearranging the equation:

Now, for determining the number of moles of :

Substituting the values in formula (1):

Hence, the molality of the solution is .

c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current