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A salt was found to be composed of potassium, carbon and oxygen. Elemental analysis revealed it to be 470.5 parts-per-thousand (ppth) potassium and 144.5 ppth carbon. Explain what is the empirical formula of this salt? From knowledge of chemical nomenclature deduce the salt's unit formula and name.
Calculate the proportion by mass of titanium in Sphene. Give your answer as a percentage to 2 significant figures. You will need to consult the Periodic Table in Book 4, page 48, to obtain the relative atomic masses of the elements in the mineral.
the modulus of elasticity for a ceramic material having 5.5 volporosity is 319 gpa.a calculate the modulus of
Indicate how many electrons are transferred in the formation of one formula unit of product
The pH of a bicarbonate-carbonic acid buffer is 7.80. Calculate the ratio of the concentration of carbonic acid (H2CO3) to that of the bicarbonate ion (HCO3-).
Write the structural formula for the product that forms when 1-methylcyclopentene reacts with Br2 in H2O
Calculate the wavelength, in nanometers, of the spectral line produced when an electron in a hydrogen atom undergoes the transition from the energy level
2A(g) + 3B(g) → A2B3(g) If 0.5 atm of gas A is mixed in an evacuated reaction flask with 1.0 atm of gas B, what is the final pressure in the reaction flask? (assume that the reaction goes to completion)
The fluorescence intensity for the diluted sample at 347.5 nm offers a reading of 245 on an arbitrary scale. A standard 100-ppm quinine solution registered 125 when measured under conditions identical to those for the diluted sample. Compute the m..
the enzyme acetylcholinesterase,which has a turnover rate of 25,000 s-1. Calculate how long it takes the enzyme to cleave one acetylcholine molecule.
what concentration of aqueous NaCl solution freezes at -15.2 C? the freezing point of pure water is 0.0 C and Kf of pure water is -1.86 C/m.
A flask is charged with 0.140 mol of A and allowed to react to form B according to the following hypothetical gas-phase reaction. A(g) B(g) The following data are collected. times (s) 0 40 80 120 160 moles of A 0.140 0.068 0.049 0.031 0.019 (a)
A sample of pure NO2 is heated to 388C at which temperature it partially dissociates according to the equation.
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