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The two isotopes of uranium, 238U and 235 U, can be separated by effusion of the corresponding UF6 gases. What is the ratio (in the form of a decimal) of the root-mean-square speed of 238UF6 to tha
When a metal was exposed to light at a frequency of 3.09× 1015 s^(-1), electrons were emitted with a kinetic energy of 3.50× 10^(-19) J. What is the maximum number of electrons that coul
Write the balanced net equation for the reaction that occurs when 0.1 M aqueous solutions of potassium hydroxide and iron(III) acetate are mixed
The Half Life for the beta decay of Au-198 is approximately 2.7 days. Write the nuclear equation for this process. How many day s must pass to reduce a 5.00-g sample of Au to 0.625 g.
Which of the following enzymes or processes can be involved in repairing DNA in E. coli damaged by UV light-induced formation of a thymine dimer?
If the heat of combustion for a specific compound is -1390.0 kJ/mol and its molar mass is 61.39 g/mol, how many grams of this compound must you burn to release 821.90 kJ of heat?
What is the maximum number of electrons that could be ejected from this metal by a burst of light (at some other frequency) with a total energy of 5.04 × 10^-7 J?
A 24 g sample of a non-volatile solute whose molecular weight is 48 g/mol is dissolved in 90 g of water. The solute is a non-electrolyte. What is the vapor pressure of the solution at 25°C? The
If 1.00 mol of glucose is submitted to combustion analysis, how many moles of CO2 and how many moles of H2O would be formed?
A 26.1 g sample of pure iron at 77°C is dropped into 93 g of water at 17°C. What is the final temperature of the water-iron mixture?
Exactly 50.0ml solution of Na2CO3 was titrated with 65.8ml of 3.00M HCl. If the specific gravity of the Na2CO3 solution is 1.25, what percent by weight of Na2CO3 does it contain?
The reaction of barium metal with liquid water produces 660.2 kJ of heat for every mole of barium that reacts. One of the products is barium hydroxide. Calculate the amount of heat associated with 3
What is specific heat of a 19g metal object heated to 96 degrees C then added to a calorimeter containing 75g of water at 18 degrees C. Final temperature is 22 degrees C? What is the metal?
How much heat is required to heat 10.0g of ice at -5.00 degree Celsius to become water vapor at 107.00 degree Celsius?
which of the following ionic compounds would have the most negative lattice energy: nacl, kcl, or mgcl2. Explain your answer.
A zero-order reaction has a constant rate of 3.20×10-4 M/s. If after 60.0 seconds the concentration has dropped to 9.00×10-2 M, what was the initial concentration?
Initially a container contains 0.60 M HI, 0.038 M H2, and 0.15 M I2 at equilibrium. What is the new equilibrium concentration of H2, if the H2 concentration is increased by 0.299 M?
Discuss the differences observed in the IR and NMR spectra of 3-nitrophthalhydrazide and luminol that are consistent with reduction of the nitro function to an amino group in this experiment (synth
certain anesthetic contains 64.9% C 13.5% h and 21.6% O by mass. at 120 degrees celsius and 750 mm hg, 1 l of the gaseous compound weighs 2.3g what is the molecular formula of the compound'
In about 200 words, outline the issues that a user might encounter when using a web browser on a smart phone to view a web page. explain what a web designer might do to address those issues.
The normal boiling point of the solution is 61.51?C, the normal boiling point of CCl4 is 61.2?C. The boiling point constant for CCl4 is 4.95 K · kg/mol. What is the molar mass of the compound
A student found that her mixture contained 6% NH4Cl, 29% NaCl, and 75% SiO2. Assuming that her weighing and calculations were correct, what was the possible source of error in her experiment?
Suppose that ammonia (a monoprotic base), applied to a field as a fertilizer, is washed into a farm pond containing 3.0 × 106 L of water. If the pH of this pond is found to be 9.81, what volu