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Earth's surface are is 5.10 X 10^8 km^2; its crust has a mean thickness of 35 km and a mean density of 2.8 g/cm^3. The most two most abundant elements in the crust are oxygen (4.55 X 10^5 g/t, where t stands for metric ton; 1 t=1000kg) and silicon (2.72 X 10^5 g/t), and the two rarest non radioactive elements are ruthenium and rhodium, each with an abundance of 1 X 10^-4 g/t. What is the total mass of each of these elements.
30.0 mL of a 3.0 M KOH solution are diluted to 250.0 mL. What is the molarity of the diluted KOH solution? 3)what volume of 1.00 M NaOH is required to prepare 500.0 mL of 0.250 M NaOH? then explain how to prepare this solution.
Explain the trituration process and why all of the CH2Cl2 solvent must be removed to yield piperine crystals
Consider a glass of 215 mL of water at 28°C. Calculate the mass of ice at -15°C that must be added to cool the water to 10°C after thermal equilibrium is achieved.
Explain why the element bromine prefers to have its two atoms form covalent bonds rather than ionic bonds
A solution is made by mixing 42.0 mL of ethanol, C2H6O, and 58.0 mL of water. Assuming ideal behavior, what is the vapor pressure
Understanding of Chemistry basics - explain a situation that violates the second law of thermodynamics?
Based upon your answer to Part a, do you think a significant amount of salt would form from mixing quimolar amounts of benzoic acid and 4-nitroaniline? Explain your reasoning.
Write the rate law for this version of the iodine clock reaction. Could the rate law have been predicted using the coefficients in the balanced equation? Explain
To determine the freezing points of distilled water, 1m glucose, 1m NaCl, 1m CaCl2. Use the freezing point of the pure water as a baseline to determine deltaTf for each of the solutions
approximately how many grams of NH4Cl will dissolve in 100g of H2O at 70 C?
The professor wants us to do the following: Outline all steps in the possible synthesis of each of the following compounds from benzene and / or toluene
25.0 mL of 1.00 M HCl at 24.3oC react with 25.0 mL 1.00 M NaOH in a styrofoam calorimeter whose calorimeter constant is 70 J/C. The final temperature is 31.8o C. Assume the density of the solution product is 1.00 g/mL and the specific heat of the ..
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