Chem

posted by .

Bromine melts at -7.25 degree C and boils at 58.8 degree C. The enthalpy of fusion of bromine is 10.57 kJ/mol and the enthalpy of vaporization of bromine is 29.96 kJ/mol. The specific heat of liquid bromine is 0.474 J/g∙K. How much heat, in kJ, is required to convert 25.0 g of solid bromine at -7.25 degree C to the gas phase at 58.8 degree C?

• Chem -

From solid at the start to the melting point, heat required is
q1 = mass x specific heat solid x (Tfinal-Tinitial)

At the melting point, q for melting is
q2 = mass solid x heat fusion

From the melting point to the boiling point, q for heating the liquid phase is
q3 = mass x specific heat x (Tfinal-Tinitial)

At the boiling point, the heat to convert to vapor is
q4 = mass liquid x heat vaporization

Total heat is q1 + q2 + q3 + q4.

Respond to this Question

 First Name School Subject Your Answer

Similar Questions

1. college chemistry-thermochemistry

i have one more question: I know this one has to do with hess's law but i'm not sure of how to get the enthalpy of vaporization from this?
2. chem

If 25ml of bromine, a liquid element at room temp is added to 100ml of water, what would be the resulting molar concentration of bromine?
3. Chem

If 25 ml of bromine, a liquid element at room temperature, is added to 100ml of water, what would be the resulting molar concentration of bromine?
4. PHYSICAL SCIENCE PLEASE HELP REALLY APPRECIATE IT!

In the reaction between bromine and sodium, a bromine atom gains an electron. What ion is formed?
5. chemistry

The heat of vaporization of bromine at its boiling point (59.6 °C) at 1.00 atm is 29.54 kJ/mol. Calculate the vapor pressure of bromine at 37.8 °C.
6. A.P. Chemistry

10. What mass of LiSO4 (110 g/mol) is required to prepare 30mL of 0.20M LiSO4?
7. Modern Chemistry

Bromine has two naturally occurring isotopes. Bromine-79 has a mass of 78.918 amu and is 50.69% abundant. Using the atomic mass reported on the periodic table, determine the mass of bromine-81, the other isotope of bromine.
8. Chemistry

Bromine has two naturally occurring isotopes. Bromine-79 has a mass of 78.918 amu (atomic mass unit) and is 50.69% abundant. Using the atomic mass reported on the periodic table, determine the mass of bromine-81, the other isotope …
9. Chemistry

In the reaction between bromine and sodium, a bromine atom gains an electron. What ion is formed?
10. chemistry

A flask contains 0.260 mol of liquid bromine, Br2. Determine the number of bromine molecules present in the flask. Express your answer numerically in molecules.

More Similar Questions