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Mesitylene is a compound consisting only of C and H. If you burn 0.115 g of the compound, and find that it produces 0.379 g of CO2 and 0.1035 g of H2O, determine the empirical formula of the compou
32P decomposes by a first-order mechanism and has a half-life of 14.3 days. How many milligrams of a 298 mg sample remains unreacted after 23 days.
A rifle is aimed horizontally at a target 54.0m away. The bullet hits the target 2.50cm below the aim point. a) What was the bullets flight time?
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 0.006-kg bullet is fired into a 01.100-kg block of wood at rest on a horizontal surface. After impact, the block with the embedded bullet slides .200 m before coming to rest. If the coefficient of
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?
What is the magnitude of the apparent weight of a 69 kg astronaut 3500 km from the center of the Earth's Moon in a space vehicle accelerating toward the Moon at 3.8 m/s^2 ?
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?
A thermos contains 143 cm3 of coffee at 90 C. To cool the coffee you drop 2 13.0-g ice cubes into the thermos. The ice cubes are initially at 0 C and melt completely. What is the final temperature o
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?