(Answered) Calculate the amount of heat required

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Question 1: Calculate the amount of heat required to completely sublime 77.0 g of solid dry ice (CO2) at its sublimation temperature. The heat of sublimation for carbon dioxide is 32.3 kJ/mol.

Question 2: A 90.0 mL sample of water is heated to its boiling point. How much heat (in kJ) is required to vaporize it? (Assume a density of 1.00 g/mL.)

Question 3: Benzene has a heat of vaporization of 30.72kJ/moland a normal boiling point of 80.1 °C. At what temperature does benzene boil when the external pressure is 470 torr ?

Question 4: Niobium has a density of 8.57 g/cm3 and crystallizes with the body-centered cubic unit cell. Calculate the radius of a niobium atom.

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