When a solid dissolves in water, heat may be evolved or absorbed. The heat of dissolution(dissolving)...

When a solid dissolves in water, heat may be evolved or absorbed. The heat of dissolution(dissolving) can be determined using a coffee cup calorimeter.

In the laboratory a general chemistry student finds that when 5.22 g of CsClO₄(s) are dissolved in 100.70 g of water, the temperature of the solution drops from 23.33 to 20.10 °C.

The heat capacity of the calorimeter (sometimes referred to as the calorimeter constant) was determined in a separate experiment to be 1.64 J/°C.

Based on the student's observation, calculate the enthalpy of dissolution of CsClO₄(s) in kJ/mol.

Assume the specific heat of the solution is equal to the specific heat of water.

ΔH_dissolution = _____kJ/mol

Solutions

Expert Solution

Heat lost by water Q = mcdT c = heat capacity of water

= (100.7 g) x (4.18 J/g·°C) x (23.33 - 20.10)°C

= 1359.6 J

Supposing the calorimeter to be at the same temperatures as the water:

Heat lost by calorimeter = heat capacity of calorimeter x temp difference
= ( 1.64 J/°C) x ((23.33 - 20.10)°C

= 5.3 J

Hence,

Heat gained by solute = total heat lost by combined apparatus

= 1359.6 J + 5.3 J

= 1364.9 J

Then,

enthalpy of dissolution of CsClO4(s) = 1364.9 J / moles of CsClO4(s)

= 1364.9 J/ 5.22 g / 232.36 g/mol [ moles = mass/ molar mass ]

= 60756 J

= 60.756 kJ/mol

Therefore,

ΔHdissolution = 60.756 kJ/mol

queen_honey_blossom answered 1 year ago

Next > < Previous

Related Solutions

When a solid dissolves in water, heat may be evolved or absorbed. The heat of dissolution...

When a solid dissolves in water, heat may be evolved or absorbed. The heat of dissolution (dissolving) can be determined using a coffee cup calorimeter. In the laboratory a general chemistry student finds that when 8.77 g of CsBr(s) are dissolved in 115.80 g of water, the temperature of the solution drops from 22.62 to 20.13 °C. The heat capacity of the calorimeter (sometimes referred to as the calorimeter constant) was determined in a separate experiment to be 1.62 J/°C....

When a solid dissolves in water, heat may be evolved or absorbed. The heat of dissolution...

When a solid dissolves in water, heat may be evolved or absorbed. The heat of dissolution (dissolving) can be determined using a coffee cup calorimeter. In the laboratory a general chemistry student finds that when 4.56 g of NH4Cl(s) are dissolved in 116.60 g of water, the temperature of the solution drops from 24.83 to 22.08 °C. The heat capacity of the calorimeter (sometimes referred to as the calorimeter constant) was determined in a separate experiment to be 1.65 J/°C....

When a solid dissolves in water, heat may be evolved or absorbed. The heat of dissolution...

When a solid dissolves in water, heat may be evolved or absorbed. The heat of dissolution (dissolving) can be determined using a coffee cup calorimeter. In the laboratory a general chemistry student finds that when 2.06 g of CaCl2(s) are dissolved in 112.20 g of water, the temperature of the solution increases from 23.13 to 26.44 °C. The heat capacity of the calorimeter (sometimes referred to as the calorimeter constant) was determined in a separate experiment to be 1.84 J/°C....

When a solid dissolves in water, heat may be evolved or absorbed. The heat of dissolution...

When a solid dissolves in water, heat may be evolved or absorbed. The heat of dissolution (dissolving) can be determined using a coffee cup calorimeter. In the laboratory a general chemistry student finds that when 0.68 g of KOH(s) are dissolved in 104.30 g of water, the temperature of the solution increases from 22.14 to 23.80 °C. The heat capacity of the calorimeter (sometimes referred to as the calorimeter constant) was determined in a separate experiment to be 1.82 J/°C....

1) When a solid dissolves in water, heat may be evolved or absorbed. The heat of...

1) When a solid dissolves in water, heat may be evolved or absorbed. The heat of dissolution (dissolving) can be determined using a coffee cup calorimeter. In the laboratory a general chemistry student finds that when 2.99 g of CuSO4(s) are dissolved in 109.10 g of water, the temperature of the solution increases from 23.83 to 26.84 °C. The heat capacity of the calorimeter (sometimes referred to as the calorimeter constant) was determined in a separate experiment to be 1.58...

1) When a solid dissolves in water, heat may be evolved or absorbed. The heat of...

1) When a solid dissolves in water, heat may be evolved or absorbed. The heat of dissolution (dissolving) can be determined using a coffee cup calorimeter. In the laboratory a general chemistry student finds that when 23.66 g of Cs2SO4(s) are dissolved in 105.90 g of water, the temperature of the solution drops from 24.54 to 21.19 °C. The heat capacity of the calorimeter (sometimes referred to as the calorimeter constant) was determined in a separate experiment to be 1.60...

1a. When a solid dissolves in water, heat may be evolved or absorbed. The heat of...

1a. When a solid dissolves in water, heat may be evolved or absorbed. The heat of dissolution (dissolving) can be determined using a coffee cup calorimeter. In the laboratory a general chemistry student finds that when 1.33 g of CaBr2(s) are dissolved in 103.70 g of water, the temperature of the solution increases from 24.23 to 25.85 °C. Based on the student's observation, calculate the enthalpy of dissolution of CaBr2(s) in kJ/mol. Assume the specific heat of the solution is...

1. When a solid dissolves in water, heat may be evolved or absorbed. The heat of...

1. When a solid dissolves in water, heat may be evolved or absorbed. The heat of dissolution (dissolving) can be determined using a coffee cup calorimeter. In the laboratory a general chemistry student finds that when 11.14 g of CsBr(s) are dissolved in 119.50 g of water, the temperature of the solution drops from 22.60 to 19.51 °C. The heat capacity of the calorimeter (sometimes referred to as the calorimeter constant) was determined in a separate experiment to be 1.61...

When a solid dissolves in water, the solution may become hotter or colder. The dissolution enthalpy...

When a solid dissolves in water, the solution may become hotter or colder. The dissolution enthalpy (dissolving) can be determined using a coffee cup calorimeter. In the laboratory a general chemistry student finds that when 2.81 g KClO4(s) is dissolved in 111.30 g water, the temperature of the solution drops from 24.18 to 21.80 °C. The heat capacity of the calorimeter (sometimes referred to as the calorimeter constant) was determined in a separate experiment to be 1.69 J/°C. Based on...

How much heat in kilojoules is evolved or absorbed in the reaction of 292.5 g of...

How much heat in kilojoules is evolved or absorbed in the reaction of 292.5 g of calcium oxide with enough carbon to produce calcium carbide? CaO(s)+3C(s)→CaC2(s)+CO(g) ΔH∘ = 464.6kJ

Subjects