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How long would a Hydrogen atom take to travel from the center of the Sun to the Earth if it could escape the Sun and if no energy losses occurred during the journey?
Classify the principal conjugate acid/base pair and compute the ratio between them in a solution that is buffered to pH 9.00 contains H2S, thylenediamine dihydrochloride, H3AsO4, and H2CO3
1. Explain how to use Lewis electron-dot symbols to depict main-group atoms and ions. 2. How to explain the electronic structure of ions using electron configurations and Lewis electron-dot symbols.
The heat of vaporization of water is 9.72 Kcal/mol.How much heat (in kilocalories) is required to vaporize 2.70 mol of H2O and how much heat (in kilocalories) is released when 440 grams of steam condenses
Calculate the pH of a buffer solution that contains 0.25 M benzoic acid (C6H5CO2H) and 0.15 M sodium benzoate (C6H5COONa). [Ka = 6.5 ? 10-5 for benzoic acid]
how many miligrams of concentrated sulfuric acid (H2SO4) [having the strength is 18 M], are required to prepare 750 ml of 3.0 M
Suppose that a sample of gas occupies 192 mL of volume at 25C and a pressure of 206 torr. What would be the volume if the pressure were changed to 506 torr at 25C.
Calculate the pH at the points in the titration of 40.00 mL of 0.425 M NH3 for the reaction below. NH3(aq) + HNO3 ? NH4+(aq) + NO3?(aq) For NH3, Kb = 1.8x10-5. Enter your answer with 2 decimal places. Enter scientific notation as 1.23E4. (a) When ..
Calculate the heat of formation of Magnesium oxide (MgO). Data given are: Mg(s) +2HCl (aq) ......> MgCl2 (aq) + H2 (g) ?H = 462 kJ/mol MgO(s) + 2HCl (aq) .......> MgCl2 (aq) + H2O (l) ?H = -146.0kJ/mol H2 (g) + 1/2O2 (g) .........> MgO (aq) ?H = -..
What practical advantage does an extraction solvent that is denser than water have over one that is less dense
a sealed container contains 6 mol of hydrogen and 1 moles of nitrogen gas. if the total pressure in the container is
Please select one example each of a food you like and a food you dislike and describe the chemistry that might account for your preferences. You may be surprised to learn that there are certain chemicals present in foods that might be found other ..
Problem- The components listed on the label of a typical box of salt are sodium chloride, sodium silicoaluminate, sodium Thiosulfate, and potassium iodide. On the basis of its ingredients, would you conclude that table salt is a substance or mixtu..
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