Question

4 g of naoh dissolved in excess of 6.3percent by mass of hno3 solution of density 1.4 g cm-3 the heat evolved in kj for complete neutralisation of base is

Answer 1

Answer:

5.71 k

Explanation:

HNO3 is in excess that means NAOH is limiting reagents and we all know that enthalpy of neutralisation for string base is 57.1 kj per mole

but here

$\frac{4}{40} = 0.1 \: mole$

of NAOH is present therefore

1 mole --------- 57.1 kj

0.1 mole -------- 5.71 kj