Calculation

A person ate 0.50 pound of cheese (an energy intake of 4000kJ). Suppose that none of the energy was stored in the body. What mass (in grams) of water would be needed to perspire in order to maintain his original temperature? (It takes 44.0 kJ to vaporize i mol of wate)

Lewis Structure

Draw the Lewis Structure for the ClF2+ion.What are its electron-pair and molecular geometries? What orbitals on Cl and F overlap to form bonds between these elements? Lewis structure: Electron pair geometry: Molecular geometry: Cl and F orbitals: Draw the Lewis Structure for the AlF4-. What are its electro ...continues

Understanding Gibbs Free Energy Change Qualitatively

I understand the quantitative meaning of Gibbs free energy. But, I am having difficulty in qualitatively understanding the meaning of Gibbs free energy. I know that the decrease in Gibbs free energy of a system in any change is the measure of the USEFUL WORK or NET WORK derived during the change. Please explain that wha ...continues

Water processing problem

Write the reaction between ferric chloride and lime slurry that results in precipitation of Fe(OH)3. For a dosage of 40 mg/l FeCl3: What is the required stoichiometric addition of lime expressed as CaO? How many pounds of Fe(OH)3 are produced per million gallons of water treated? NOTE: Moved from Civil and Environmental Engin ...continues

Nitrogen, N2, can ionize to form N2+ or add an electron to give N2-. Using molecular orbital theory, compare these species with regard to their magnetic character, net number of pi bonds, bond order, bond length, and bond strength.

Nitrogen, N2, can ionize to form N2+ or add an electron to give N2-. Using molecular orbital theory, compare these species with regard to their magnetic character, net number of pi bonds, bond order, bond length, and bond strength.

Hess's Law

I am having trouble with a question in my homework. It states: Given the following thermochemical equations 2KCl(s) + 3O2(g) .......2KClO3(s) Change in H = 78.0kJ P4(s) + 6Cl2(g)..........4PCl3(g) Change in H = -1148.0kJ P4(s) + 2O2(g) + 6Cl2(g).........4POCl3(g) ...continues

Heat and Heats of Formation

This is a 2 part question I have for homework and I am completely lost. The question states: Given 2BaCO3(s) ---> 2Ba(s) + 2C(s) + 3O2(g) Change in H = 2432.6kJ First they ask for me to determine the heat of formation of BaCO3. My problem is how do you determine the heat formation of the reactant ...continues

Rate expression for Reaction

I am having a real hard time with these problems. My professor is flying through these and not explaining them thoroughly enough for me to understand. I'm hoping you could help me with this. This is the question: The equation for the reaction between iodide and bromate in acidic solution is 6I-(aq) + BrO3-(aq) + 6H+(a ...continues

reaction rate and tempersture

For the reaction: C2H4(g) + H2(g)----> C2H6(g) the activation energy is 181kJ/mol. The rate constant at 1000 degrees celsius is 1.6 x 10^3 L/mol/s. A.) at what temperature is the rate constant half its value at 1000 degrees Celsius? B.) What is the rate constant at 725 degrees Celsius? I was given this as a hom ...continues

write equation

esterification, write equation to show formation of ethyl formate