In the reaction between strong acid and strong base, 1.8 g of water is formed. The heat evolved is used to raise the temperature of one kg of water at `25^@C`. What is the final temperature of water? 

Explanation

Number of moles of water formed
`= ("weight of water")/("gram molecular weight") = (1.8)/18 = 0.1`
  Heat liberated `= 13.7 xx 0.1 = 1.37 K`. Cal. Heat (q) is given as, `q = ms q 1.37 xx 1000 = 1000 xx 1 xx q`.
  The rise in temperature of water `q = 1.37^@`. Final temperature of water = `25 + 1.37^@ = 26.37^@C`