When pure sulfuric acid is dissolved in water, heat is evolved. in a laboratory experiment to measure the molar heat of solution of sulfuric acid, the following procedure was followed. to a calorimeter containing 3.00 × 102 g of water at 20.00 °c, 10.65 g of h2so4, also at 20.00 °c was added. the tempera­ture change, which was monitored by a digital thermometer with negligible heat capacity, ceased when it reached a temperature of 26.55 °c. if the specific heat of the mixture is 4.184 j g‑1 °c‑1, and the small heat capacity of the calorimeter is ignored, what is the heat evolved, per mole of sulfuric acid? show an overview of your work.

The amount of heat evolved per mole of sulfuric acid is 78104.7 Joules.

Explanation:

We are given:

Mass of water =

Mass of sulfuric acid = 10.65 g

To calculate the amount of heat evolved, we use the equation:

where,

m = mass of water + sulfuric acid = [300 + 10.65] = 310.65 g

c = specific heat capacity of mixture = 4.184 J/g.°C

= change in temperature =

Putting values in above equation, we get:

To calculate the number of moles, we use the equation:

Given mass of sulfuric acid = 10.65 g

Molar mass of sulfuric acid = 98 g/mol

Putting values in above equation, we get:

Calculating the heat released per mole of sulfuric acid, we get:

Hence, the amount of heat evolved per mole of sulfuric acid is 78104.7 Joules.

"standard molar enthalpy:

h2o ( liquid water ) : - 285.8 kj/mole

h2o ( water vapor ) : - 241.8 kj / mole.

δhrxn = - 241. 8 - ( - 285.8 )= -241.8 + 285.8 = 44.0

answer: 44.0 kj"