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What is the freezing point in (C) the solutions below? For water, Kf=1.86 (Ckg)/mol. The vapor pressure of water at 45.0 C is 71.93mm Hg.
1. A solution of 12.5 g of urea, CH4N2O, in 135 g of water at 45 C.
A solution of methanol, CH3OH, cotains 55.0 grams of methanol in 100. mL of water solution. What is the molarity of methanol in the solution?
Iron has a density of 7.874. g/cm3. What is the mass of a rectangular block of iron with dimensions of 3.000 cm by 4.000 cm by 5.000 cm
If I want to make the buffer by adding 0.100 M NaOH instead of sodium acetate, how many milliliters of NaOH are needed to reach pH=4.74?
Is it possible to have homogeneous binary liquid solution whose viscosity is higher or lower than that of either of the two component liquid? what conclusions would you draw about the nature of intermolecular interactions in such a mixture
Write the molecular formula for a compound with the possible elements C, H, N & O that exhibits a molecular ion at M+ = 96.0571. Molecular formula (In the order CHNO, with no subscripts)
A solution of NaF is added dropwise to a solution that is 0.0144 M in Ba^2+. When the concentration of F^- exceeds __________ M, BaF2 will precipitate. Neglect volume changes. For BaF2, K sp = 1.7 X 10^-6.
If the following elements (Ca,V,Mn,Ni,Zn) were listed from smallest (1st) to largest (5th) ionization energy, where would Calcium be listed
Consider the titration of a 25.0 mL sample of .125M RbOH with .105M HCl. Find the initial pH.
A 25.00 mL sample containing Fe3+ was treated with 10.00 mL of 0.0367M EDTA to complex all of the Fe3+ and leave excess EDTA in solution. The excess EDTA was then titrated, requiring 2.37 mL of 0.0461M Mg2+ standard solution.
Explain which of the following species has the shortest, strongest covalent bond: CN^- , CO2 , C2^2- , CO^2- , CO
In photosynthesis, plants use energy from the sun in combination with carbon dioxide and water to form glucose (C6H12O6) and oxygen. If 4.50 moles of water react with carbon dioxide, what mass of glucose is produced?
A mixture of gases contains 5.00 grams of Ne, 5.00 grams of O2, and 5.00 grams of CO2. What is the mole fraction of each gas. What fraction of the total pressure of the gas mix is due to each gas. If the gases are in a 25.0 L container at 25°C, wh..
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