molar enthalpy

The normal boiling point of bromine is 58.8 C. Given the athe vapor pressure pressure of methanol (sic) is 75.0 torr at 2.5 C, Calculate the molar enthalpy of vaporization of bromine. Difficulty H Show work and thanks for your help and time.

Length of a unit cell edge

Potassium bromide, KBr, crystallizes like NaCl in a face centered cubic lattice. The ionic radius of K+ is 133 pm and the ionic radius of Br- is 195 pm. Assuming that all Br- ions are positioned in the face and corners of the unit cell, while the K+ ions are positioned along the edge alternating between anions, calculate the l ...continues

Converting weight percent to molarity

What is the Molarity of a solution of 10% by mass cadmium sulfate, CdSO4 (molar mass = 208.46 gram/mol)? The density of the solution is 1.10 g/ml. Show work and thanks for your time and help.

percent CdSO4 by mass

What is the percent of CdSO4 by mass in a 1.0 molal aqueous solution? show work Calculate the amount of heat that must be absorbes by 10.0 gram of ice at -20 C to convert ith to gaseous water at 110 C. Given Specific heat ice=2.1 Joule/gram water=4.184 Joule/gram steam=1.84 Joule/gra ...continues

Moles, atoms

1) A softdrink has 70.0mg of aspertame. (nutrasweet) a) Calculate # of moles of aspertame and (b)calculate # of atoms of carbon.

Atomic Packing Factor

Show that the atomic packing factor for HCP (Hexagonal close-packed) is 0.74.

Crystalline Solid Structure

Calculate the radius of a vanadium atom, given that V has a BCC (Body-centered cubic) crystal structure, a density of 5.96 g/cm^3, and an atomic weight of 50.9 g/mol.

reactions

For the reaction BrO3- + 5 Br- + 6 H+ ---> 3 Br2 + 3 H2O at a particular time, -/[BrO3-]// t = 1.5 10-2 M/s. What is -/[Br-]//t at the same instant? Question 2 Question: The reaction A + 2 B ---> products has been found to have the rate law, rate = k [A] ...continues

buffer problem

A buffer is prepared by mixing 0.027 L of 0.029 M sodium bicarbonate and 0.021 L of 0.022 M NaOH. What is the pH?

MOLARITY of base solution

Sodium hydroxide is used extensively in acid-base titrations because it is a strong, inexpensive base. A sodium hydroxide solution was standardized by titrating 28.71 mL of 0.1822 M standard hydrochloric acid. The initial buret reading of the sodium hydroxide was 2.70 mL and the final reading was 30.33 mL. What was the molarity ...continues