Question

Calculate the amount of heat required to completely sublime 96.0 g of solid dry ice (co2) at its sublimation temperature. the heat of sublimation for carbon dioxide is 32.3 kj/mol.calculate the amount of heat required to completely sublime 96.0 g of solid dry ice (co2) at its sublimation temperature. the heat of sublimation for carbon dioxide is 32.3 kj/mol.

Answer 1

The process in which slid phase is converted into gaseous phase directly without achieving the liquid phase is said to sublimation.

The heat required to completely sublime is calculated by the product of number of moles and heat of sublimation.

$Heat required (Q)= number of moles (n)\times heat of sublimation$   (1)

And, heat of sublimation of carbon dioxide is 32.3 kJ/mol

Number of moles of carbon dioxide = $\frac{given mass in g}{molar mass}$

= $\frac{96.0 g}{44.01 g/mol}$

= $2.18 moles$

Now, put the values in formula (1)

$Heat required (Q)= 2.18 moles\times 32.3 kJ/mol$

= $70.414 kJ$

Hence, heat required to completely sublime is $70.414 kJ$