Chemistry

Molar heat of vap from fusion and vap

The molar heats of sublimation and fusion of iodine are 62.3kjmol and 15.3kjmol respectively calculate the molar heat of vaporization of liquid iodide?-Sublimation is going directly from solid to gas.

Alternative to filtering, I can't remember what it was called. Help

Lets say you have a beaker full of sand, salt, and water. The salt is well dissolved in the water, while the sand has sunk. Your purpose is to isolate the sand. My teacher told us we could take a stir

Can somebody help me with a hw chem equation problem

The problem: Suppose that the pressure of 1.00 L of gas is 380. mm Hg when the temperature is 200. K. At what temperature is the volume 2.00 L and the pressure 0.750 atm? Also can you show me the ste

How to convert MJ/Kg into J/mol

How do I convert 26.454 MJ/Kg into J/mol? Please help and thanks.-From the data you have given it is only possible to give a general formula Convert MJ to J - you know the multiplier.Convert kg to g

What is the relationship between Leptin and the Hypothalamus

And define each please.-leptin is a chemical secreted by fat cells to shut down the feeling of being hungry.it acts directly or indirectly, not really known yet, on the hypothalamus, an organ within t

Chem: Heisenberg uncertainty principle help

The Heisenberg uncertainty principle is written Δx*mΔu ≥ h/(4π). what is the minimum uncertainty in position (in Angstrom) of a hydrogen atom traveling at 1.05 * 10^4 m/s with an uncertainty of 0.10 *

Which atoms are sp^2 hybridized (with diagram)

HHHHH ....||||| O===N-----C-----C(3 bonds)C------C-------C==C==C----C----H ``|||N::O:H/\|HHH Im a little lost, so any help would be appreciated.-Any atom with a double bond and two single bonds (like

Solubility to Milality of NaCl

Help me! Convert the following solubilities of NaCl in g/100mL to molality (mol solute/kg solvent). Temp 0.0 Solubility 34.0 Temp 25 Sol 35.7 Temp 80 Sol 39.0 Temp 100 Sol 41.0 If you can do one of

You are given a 100ml bottle of sodium hydroxide..

You are given a 100ml bottle of sodium hydroxide. It contains 0.01 moles of hydroxide ions. What is the pH of the solution?-use the Molarity= moles/volume equation convert 100mL to Liters= 0.1 Liter

Le Chatelier's Principle reasoning

Using the equation: Ba(OH)2(s) --> Ba2+(aq) + 2OH-(aq) Delta H = 7820kJ -How would the solubility of solid Ba(OH)2 in water be affected by an increase in pH? How about a decrease in pH? Need to us

Titration of Analytical Sample

An analytical sample of NaOH sample was titrated with 31.5 mL of 0.80 M HCl in order to reach the equivalence point. Determine the concentration of NaOH sample if the volume titrated was 63.0 mL. The

Calculate the grams of solute required to make the following solutions. Please help. :)

Calculate the grams of solute required to make the following solutions: 1. 2500 g of saline solution (.90%) NaCl (m/m)) b. 0.050 kg of 4.0% (m/m) MgCl2-0.90 (m/m) NaCl = 0.90 g / 100 g.2500 / 100 = 25

Van der waals forces

Is hydrogen bonding considered to be a type of Van der waals force?-No. Hydrogen bonding is the electrostatic force between a hydrogen bound to an very electronegative atom (F, O, N) and a pair of non

4 Chemistry Multple Choice

1. The specific types and sequence of amino acids determine the structure and function of which of the following? (Points : 1)starches lipids nucleic acids proteins 2. Which of the following are mon

Can somebody help me with a chem equation problem

find the mass of 350 ml of nh3 at 0.921 atm & 27C and also tell me what you did to get the answer. thanks :)-PV=nRT (0.921atm) (0.35L) = n (0.08206) (300.15K) 0.3224 = n (24.63) 0.0131 = n 0.0131 time