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Problem- A solution was prepared by adding 20.0g of urea to 125 g of water at 25 C, a temperature at which pure water has a vapor pressure of 23.76 Torr. The observed vapor pressure of the solution was found to be 22.67 torr. Calculate the formula mass of the compound
Here is the problem which I am struggling on, please help me
The first four ionization energies of an atom X are 590, 1145, 4912 and 6491 kJ/mol. Suggest to which periodic group X belongs and give reasons for your choice. Write out possible chemical equations that correspond to these transformations.
The solubility of sodium chloride in water is 35.7 grams per 100 mL at 0 degrees celsius. What is the maximum amount of sodium chloride that will dissolve in 250 mL of water at 0 degrees celsius?
aluminum reacts with hydrochloric acid to produce aluminum chloride and hydrogen gas. if 927 ml of hydrogen gas is
A ground state H-atom absorbs a photon of wavelength 61.15 nm, and its electron attains a higher energy level. The atom then emits two photons: one of wavelength 3043 nm to reach an intermediate level, and a second to reach the ground state.
Suppose a student is measuring the optical rotation of a 1 M sample of (S)-(-)- Limonene. The path length is 13cm. What optical rotation should the student expect to measure?
Describe the procedure you will use to determine those cation/anion pairs that produce precipitates. Make sure you include all equipment and amounts of materials you expect to use
A 97.0 mL sample of 0.0200 M HCl is titrated with 0.0400 M RbOH solution. Calculate the pH after the following volumes of base have been added. (a) 22.3 mL pH = (b) 47.5 mL pH = (c) 48.5 mL pH = (d) 49.5 mL pH = (e) 94.1 mL pH =
have a buffer solution composed of 4.00 mol of acid and 1.75 mol of the conjugate base. If the pKa of the acid is 2.20, what is the pH of the buffer?
Determine the equilibrium concentration of A, B, and C at 525 K. What is the equilibrium constant Kc
an empty erlenmeyer flask weighs 194.4 g. when filled with water d 1.00 gcm3 the flask and its contents weigh 489.1
Calculate the empirical formula for the following compound: potassium tartrate found in baking powder: 20.8% K, 2.7% H, 25.5% C, and 51.0% O
Which of the five cobalt complexes, [Co(NH3)5X]^y+ (where X is one of the five ligands, Br-, Cl-, F-, H2O, or NH3 and y is the magnitude of the positive charge) will absorb the shortest wavelength of light? Which will absorb the longest wavelength..
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