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The atomic mass of element X is 33.42 amu. A 27.80 g sample of X combines with 90.10 g of another element Y to form a compound XY. Compute the atomic mass of Y.
The first-order reaction 2N2O(g) --> 2N2(g) + O2(g), what is the concentration of N20 after 3 half-lives if 0.25 mol of N2O is initially placed into a 1.00-L reaction vessel
Since it is only slightly soluble, assume that the volume of the solution does not change on dissolution, and calculate the solubility product. Solubility of InF3: 4.0 x 10-2 g/100. mL
how many regions of high electron density are there around the central atom of the molecular structure of SbCl3.
A student used 22.0 mL of 0.1035 M NaOH to titrate 20 mL of orange juice. How many grams of citric acid were present in the sample? The molar mass of citric acid, H3C6H5O7, is 192.12 g/mol.
calculate the length of a copper wire having a diameter of 0.200 cm and a mass of 15.620 g. the density of copper is
Methyl-m-nitrobenzoate is an excellent (identification) derivative of methyl benzoate. What are the properties of methyl-m-nitrobenzoate that makes it an excellent derivative of the starting ester
Enantiometrically pure retrosynthesis, There are many ways of making (R)3-ethyl-4-methylpent-1-yne. Explain what enantiomerically pure retrosynthesis is and show
Calculate the equilibrium constant at 0c and at 50c(assuming enthalpies of formation are independent of temp)
two moles of an ideals gas at 500k and 10 atm pressure are contained in an insulated piston-cylinder arrangement. the
baking soda (NaHCO3) can be made in large quantities by the following reaction: NaCl + NH3 + CO2 + H2O ---> NaHCO3 + NH4Cl If 9.41g of NaCl reacts with excesses of the other reactants and 3.81g of NaHCO3 is isolated, what is the percent yield of t..
Standards added to tap water contained 0.160 ng/mL (ppb) of Eu(III), but those added to pond water were 100 times more concentrated. (a) From the x intercepts in the graph, calculate the concentration of Eu(III) (ng/mL) in tap water.
Ultra-high-vacuum experiments are routinely performed at a total pressure of 1.0x10^-10 torr. Calculate the mean free path of N2 molecules at 350K
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