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Explain what is the molality of a solution that contains 3.0g urea (molecular weight=60 amu) in 100g of benzene?
Antifreeze mixture is made by mixing equal volumes of ethylene glycol (d = 1.114 g/mL, M= 62.07 g/mol) as well as water (d = 1.00 g/ml) at 20 degrees C. Express the concentration of ethylene glycol as
Explain the difference between the Bohr model for the hydrogen atom and the quantum-mechanical model.
Two future experiments are the syntheses of phenacetin and dibenzalacetone. Which, if any, of the qualitative tests performed in this lab could be used to determine of the presence of either reactants
A 100.0 mL sample of 0.20 M HF is titrated with 0.10 M KOH. Determine the pH of the solution after the addition of 200.0 mL of KOH. The Ka of HF is 3.5 × 10-4. This is at the equivalence point; so, determine the pH of the resulting salt (KF).
Type your question hereA 0.1390-g rock sample of unknown concentration was dissolved in HCl and diluted to 100.0 mL. Aliquots of 10.00 mL of this unknown solution were added to different volumes of a 2.08 ?g/mL Ca standard solution and diluted to ..
Calculate the final temperature of the solution has a specific heat capacity =4.18 J/°C · g. assuming no heat lost
Estimate the equilibrium density of a fluid whose intermolecular potential can be described by the Lennard-Jones potential. For simplicity, assume that molecules in the fluid are arranged at the vertices of a cube (cube lattice), and that these cu..
1.0 M aqueous solutions of the following substances are prepared. Which one would you expect to have the lowest electrical conductivity
What is the change in internal energy (?E) when a system loses 10 kJ of energy and 5000 J of work is done on the system?
As pH increases, hydronium ion concentration increases. As pH increases, hydroxide ion concentration increases
Firefly luciferase is the enzyme that allows fireflies to illuminate their abdomens. Because this light generation is an ATP-requiring reaction, firefly luciferase can be used to test for the presence of ATP
Iodine-131 is a radioactive isotope. After 4.00 days, 70.8% of a sample of 131I remains. What is the half-life of 131I
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