Calculate the amount of heat required to completely sublime 57.0 g of solid dry ice (CO2) at its sublimation temperature. The heat of sublimation for carbon dioxide is 32.3 kJ/mol.

41.83 J.

Explanation:

The amount of heat required to completely sublime CO₂ is

Q = cm' Equation 1

Where Q = Amount of heat required to sublime CO₂, c = heat of sublimation of CO₂, m' = number of moles of CO₂.

Molar mass of CO₂ = 12 + (16×2) = 12×32 = 44 g/mole,

If 1 mole of CO₂ contains a mass of 44 g,

57/44 moles of CO₂ will contain a mass of 57 g.

1.295 moles.

Given: c = 32.3 kJ/mol, n = 1.295 mol.

Substitute into equation 1

Q = 32.3(1.295)

Q = 41.83 J.

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