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1. What is the formula of a compound if a sample of the compoundcontains 0.537 mol X, 0.358 mol Y, and 0.895 mol Z?
2. What is the empirical formula of a compound that is 56.95% Cu,14.37% S, and 28.68% O? Write the elements in the order Cu, S, andO.A 2.218-g sample of an oxide of Ru contains 1.792 g Ru. Whatis the empirical formula of the oxide?
3. What is the empirical formula of a hydrocarbon if completecombustion or 7.000 mg of the hydrocarbon produced 22.781 mg ofCO2 and 6.994 mg of H2O? Be sure to write Cfirst in the formula. What is the molecular formula if the molar mass of the hydrocarbon is found to be about 140molecular formula
4. What is the atomic mass of element X if 3.70 g XCl3contains 1.10 g X?
5. What is the mass percent of sulfur inNa2S2O3?
Calculate the number of moles of hydrogen gas that can be produced by the reaction of excess water with 8.75 x 1021 atoms of barium.
Calculate the Ka of an unknown monoprotic acid .When 15ml of the acid was titrated with 28 ml of 0.15M sodium hydroxide the equivalence point was reached at a ph of 8.48
Why is this only an approximation? Under what conditions can the selectivityremain temperature-independent?
Draw the structure of the product of the reaction between cyclohexene and O3 then (CH3)2S Indicate stereochemistry.
Calculate the total energy (in kJ) absorbed by a person exposed to this radiation for 2.0 hours, given that there are 2.0 x 10^16 photons hitting earth's surface per square centimeter per second and the exposed body area
A beaker with 1.30×102 mL of an acetic acid buffer with a pH of 5.000 is sitting on a benchtop. The total molarity of acid and conjugate base in this buffer is 0.100 M .
calculate the fraction of atoms in a sample of argon gas at 391 k that have an energy of 12.7 kj or
Fish produce glycerol to survive the freezing waters of the Arctic. Determine the degree to which the freezing point of blood and other biological fluids is lowered with the help of glycerol. What is the ideal concentration range of glycerol requi..
Calculate the number of moles of ions produced when one mole of Co(NH3)4Cl3 is dissolved in water.
Gold has cubic crystals whose unit cell has an edge length of 407.9 pm. The density of the metal is 19.3 g/cm3. Calculate the number of gold atoms in a unit cell. What type of cubi lattice does gold have
Write the reaction mechanism (using arrows) of 6-ketoheptanal + NaOH to form the product 1-cylclopentyl methyl ketone. What type of reaction is this?
a 5.0 g sample of a hydrate of CaCl2 was heated, and only 4.3 g of the anhydrous salt remained. what percentang of water was in the hydrate?
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