What is the amount of heat released or absorbed by a reaction?

use the equation Q = mc ΔT

Q = heat energy transferred (joules)

m =mass of the liquid being heated (kilograms)

c = specific heat capacity of the liquid (joule per kilogram Celsius), ΔT = change in temperature (Celsius).

in the given question, the partial pressure is calculated by using the ideal gas equation, that is, pv = nrt

here, p is pressure, v is volume = 25 l, n is number of moles = 0.0104 moles, r is gas constant = -0.0821 l.atm / mol.k

t is temperature = 273 k

p = nrt / v

p = (0.0104 mol × 0.0821 l.atm / mol.k × 273 k) / 25 l

= 0.0093 atm