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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.
A balloon has a volume of 1.75L at a temperature of 25°C. What will be the volume of the balloon if you take it out into the winter cold air at -15°C?
What is the equivalence point volume? What is the cell potential at each of the following volumes of added Ce4+ ?
Using bond-line formulas, draw 6 constitutional isomers that have 1) the molecular formula C5H10O, and 2) a three membered ring
Plot pH values as a function of volumes of added KOH and suggest appropriate indicators for the titration.
aluminum may be formed by the passage of 60,714 C through an electrolytic cell that contains a molten aluminum salt.
A 28.0-g sample of nitrogen gas combines completely with 6.0 of hydrogen gas to form ammonia. What is the mass of ammonia formed.
When 1.00 g of urea (CO(NH2)2) is dissolved in 200g of solvent A, the freezing point is lowered by 0.250C. When 1.50 g of the nonelectrolyte Y is dissolved in 125 g of the same solvent
A solution containing 0.2 mol of KBr and 0.2 mole of MgBr2 in 2.0 liters of water is provided. How many moles of Pb(NO3)2 must be added to precipitate
What is the molar concentration of the excess reactant once this reaction has finished? (40%)
Treatment of this disaccharide with alpha mannosidase yields D-mannose and D-glucose. Draw the structure of the trisaccharide and state its systematic name.
derive an euation relating the temperature to the velocity of the gas.if nitrogen at 150 degree celcius flows past one section of the tube at a velocity of 2.5 metre/second,what is its temperature at another section where its velocity is 50 m/s
Determine the partial pressures of each of the reactants CH4 O2 NO in the flask and the partial pressures and of each of the products and the total pressure in the flask
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