when zn dust is added to sufficiently large volume
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Knowing the amount of
CuSO₄ as well as its heat capacity and that it reacted completely, we
can calculate the enthalpy change for this reaction using the formula: Enthalpy change = - (mass of water x specific heat capacity x temperature change)
ΔH* = m x c x Δt
Mass of water (g) = volume of copper sulphate solution (cm^3)
Mass of water = 25 grams
Specific heat capacity = 4.2 J g ^-1 deg^-1
Temperature change = 7.2 degree celsius
Enthalpy change (Joules) = -( 25 x 4.2 x 7.2) J
Molar enthalpy change = Enthalpy change / moles of solute used
Enthalpy change = - 756 J
Moles of solute =0.0125
Molar enthalpy change = -756 / 0.0125 = - 60, 480 Joules = -60.5 kJ mol^-1
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