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Discuss why does sealing the open end of a melting point capillary tube allow you to measure the melting point of a compound that sublimes?
Determine the pH of a solution prepared by dissolving the 0.27moles of formic acid (HCOOH) and 0.37 moles of sodium format (NaCOOH) in 2.00L solution. (Ka=0.00018)
The adult burns 2.0*103 Cal per day. An adult eats food whose nutritional energy totals approximately 2.2*103 Cal per day. Discuss how much excess nutritional energy, in kilojoules, does the
A chemist on another planet performed the Millikan oil-drop experiment and measured the following charges in his planet's unit for charge, the bot: 2.62 x 10-13 bots; 3.93 x10-13 bots; 6.5
Assume the contaminant is methane (MW = 16) and temperature =25°C. Determine the mass per volume concentration of a gaseous contaminant with a concentration of 10 ppm?
If the masses of the empty flask were 56.12g and87.39g, respectively, and the density of water is 0.9976 g/mL, determine the volume of the flask in mL.
If inhaled air contains21% oxygen by volume and exhaled air is 16% oxygen by volume, what is the volume of air per breath? A resting adult requires about 240mL of pure oxygen/min and breathes about
Iron (II), ions react with the permanganate ions, MnO41- (aq) in an acidic solution to form the Fe3+ (aq) ions. A 6.893 gram sample of iron ore was crushed and treated with concentra
Determine the minimum and maximum number of bonds that chlorine (Cl) produces? Assume chlorine bonds with hydrogen. Is the minimum 1and the maximum 7?
Determine the molarity of 10% concentrated HC or 5% sodium hydroxide? Determine the numbers of moles of each reagent are in 1 mL of these solutions?
The total nuclear binding energies of Al-27, Mg-27, Si-27 are 244.2667, 246.8741, and 241.6741 MeV, respectively. Calculate the values of the Coulomb energy and asymmetry energy coefficients
There is the possibility that your compound may crystallize out on the filter paper thus reducing the percentage yield of your crystals during the vacuum filtration of the hot solution of your compo
There are approximately 25 drops per milliliter of water depending upon the tip of a dropper pipet. Determine the proximate volume of one drop of an aqueous solution?
Calculate how many kilograms of copper sulphide could be formed from the reaction of .9 mol of copper with excess sulphur?
If the masses of the empty flask and filled flask were 56.12g and 87.39 g, respectively, and the density of water is 0.9976g/mL, determine the volume of the flask in mL.
Determine the freezing point of this solution? A solution is prepared by condensing 4.00 L of a gas, measured at the 270C and 748 mmHg pressures into the 58.0g of benzene.
Use the semi empirical mass equation to determine the percentage contribution to the average binding energy per nucleon of the volume energy for A=60 and A =240
What will be the total pressure of the gases in the flask after 1.5 hours? At a particular temperature the first-order gas-phase reaction 2N2O5→ 2N2O4 +O2 has a half-life for the disap
Determine change in H for the solution process when a 6.50g sample of solid sodium hydroxide dissolves in the 100.0gof water in a "coffee cup" calorimeter, the temperature rises from 21.6 degrees Ce
Discuss how each of the following changes would lead to a high result, low result, or no change in the percent Acetylsalicylic (ASA) measured for an aspirin tablet.
Explain how you could separate the following pairs of ions by precipitating both of them individually in sequence. For each precipitation, write a net ionic equation of the reaction.
A 10 m Laliquot of a hydrochloric acid solution was titrated with 0.04029M NaOH. The following titration data were collected. The neutralization required 25.99 mL of the basic solution.
A 0.200 g sample of hemoglobin is dissolved in the water to provide10.0 mL of solution, which has an osmotic pressure of 5.5 torr at 25 oC. Hemoglobin contains 0.33% Fe by mass.
Calculate the entropy change associated with the isothermal compression of 6.64 mol of ideal gas atoms from the 5.81 atm to 14.75 atm?
Calculate the number of kilowatt-hours of electricity to form the 1.00 kg of Mg from electrolysis of molten MgCl2 if the applied emf is 5.00 V. Assume that the process is 100% efficient.