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You are given a small bar of an unknown metal X. You find the density of the metal is 10.5 g/cm^3. Another experiment tells you the edge-length of the face centered cubic unit cell of this metal has
A hot air balloon has a volume of 4.00 x 10^5 L at 30 deg. C and pressure of 748 mmHg. If the avg molar mass of air is 29.0 g/mol, what is the mass of the hot air balloon?
Phosphorylation can also serve to activate or inactivate specific enzymes. Give an example of one amino acid that can be phosphorylated and suggest at least two ways that phosphorylation could contr
A mixture of 0.200 mol of NO2 and 0.200 mol of CO is placed in a 1.00L flask and given time to equilibrate. Analysis of the equilibrium mixture indicates that 0.134 mol of CO2 is present. Calculate
Experimental evidence suggests that the nitrogen atom in ammonia, NH3 has four orbitals in the shape of a pyramid or tetrahedron. Draw an energy level diagram to show the formation of these orbitals
What has happened to the concentration of ascorbic acid in the solution in the flask over this waiting period (before the titration.)? Show your calculations.
An old container of KOH has been found in the chemistry lab. Determine the percent purity of the sample of KOH found in the lab (Molar mass of KOH = 56.1 g/mol).
Determine the mass of MgC12 (Molar mass = 95.2 g/mol) that was added to the original 250 0 mL volumetric flask as well as the volume of AgNO3 solution used in the titration.
A 0.1967 g sample of pure ascorbic acid is weighed out and dissolved in 50 mL of distilled water in an Erlenmeyer flask. What mass of ascorbic acid has been oxidized by one of the components of air ov
When a 90 g sample of an alloy at 100.0 oC is dropped into 90.0 g of water at 24.6 oC, the final temperature is 34.1 oC. What is the specific heat of the alloy? (The specific heat of water is 4.184
Gallium-68 decays by positron emission, with a half-life of 68.3 min. How much 68Ga remains from a 10.0 mg sample after 683 min?
Neither carbon tetrachloride nor trans CHBr=CHBr have dipole moments. Both have cery different molecular geometries. What are their molecular geometries, and why are they different?
What is the molar concentration of sodium ions in a solution in which 75.02 g of sodium sulfate and 102.75 g of sodium phosphate were completely dissolved in 500.00 mL of water and brought to a fina
Suppose that 194.2 J of heat energy is required to completely vaporize 3.3 g of a pure liquid. If the molar mass of the liquid is 91.92 g/mol, what is the molar enthalpy of vaporization of the liqui
Assume that the heat lost by the surface is gained by ethyl chloride. What enthalpies must you consider if you were to calculate the final temperature of the surface?
A 0.5220 g sample of an unknown monoprotic acid was titrated with 9.98×10?2 M NaOH. The equivalence point of the titration occurs at 23.70 mL. Determine the molar mass of the unknown acid.
How much heat is released when 105 grams of steam at 100.0 degrees celsius is cooled to ice at -15.0 degrees celsius? The enthalpy of vaporization of water is 40.67 kJ/mol.
A gas mixture is made by combining 8.9 g each of Ar, Ne, and an unknown diatomic gas. At STP, the mixture occupies a volume of 21.10 L. What is molar mass of the unknown gas?
A standard solution of sodium hydroxide has a molar concentration of 0.128M. You use 25.00ml of a solution of hydrochloric acid and this requires 32.75ml of the standardized sodium hydroxide solutio
Complete and balance the following equations, and identify the oxidizing and reducing agents. (Recall that O atoms in hydrogen peroxide, H2O2, have an atypical oxidation state.)
Discuss the solubility (in water) of some organic compounds e.g Compare alcohols, alkanes and hetones or carboxylic acid and the different types of intermolecular bonding.
What is the hydronium ion concentration and the pH of a solution formed when 30mL of 0.30M HNO3 is titrated with 43mL of 0.20M NaOH at 25C?
To pre-form the density gradient, a volume of 9.5 ml of a 60% solution of percoll was added to two polypropylene centrifuge tubes and balanced accurately.
If 10.7 mL of .110 M NaOH is required to reach the equivalence point of a solution of citric acid, how many mL of NaOH are required to completely neutralized this solution?
Write three orbital designations that would be incorrect and explain why each is incorrect. For example, 1p would be an incorrect orbital designation because there is no p sub-shell in the first orb