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A hypothetical element Z has two stable isotopes: Z-46 = 46.046 u 64.08% Z-51 = 50.826 u 35.92% What is the average atom weight of the element?
The vapor pressure of ethanol is 100 mmHg at 34.9oC. Its molar heat of vaporization is 39.3 kJ/mol. What is the vapor pressure of ethanol in mmHg at 57.5 oC?
How many mL of 0.220 M of NaOH are needed to completely hydrolyze 2.40 grams of propyl acetate.
When a metal was exposed to light at a frequency of 4.54× 10^15 s-1, electrons were emitted with a kinetic energy of 3.10 × 10^-19 J.
Calculate w (in kJ) when 376 g iron (III) oxide (MM = 159.7 g/mol) reacts with excess carbon to produce carbon dioxide gas at 335 K:
Based on the following chemical equation 2C6H6 + 15O2 12CO2 + 6H2O calculate the number of moles of CO2 that will be produced
Explain why it takes longer time when anyone cook an egg in boiling water while camping at in elevation of 0.5km in the mountain than it does it home.
Electrochemistry and Solubility, The potential of the cell Bi|Bi2S3(s) |Bi2S3(aq)|Bi is 0.96 V at 25*C. Calculate the solubility of Bi2S3, Assume it is an ideal solution.
At 25C, H2O2 decomposes according to the following equation. 2H2O2(aq) => 2H2O (l) + O2(g) .55V
A sample of nitrogen gas in a 4.7-L container at a temperature of 28°C exerts a pressure of 3.6 atm. Calculate the number of moles of gas in the sample.
Describe the nature and characteristics of PCB's. Why are they of importance to an EH&S or FS professional who encounters them when coming upon an incident scene where they are present?
What volume of a concentrated { HCl} solution, which is 36.0% { HCl} by mass and has a density of 1.179 {g/mL}, should be used to make 5.30L of an {HCl} solution with a {pH} of 1.7.
calculate the expected change in temperature for 4.5 g of NH4NO3 dissolved in 100.0 mL of H20. Assume that the calorimeter absorbs no heat. (ie. Ccal=0)
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