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Type your question hereA 0.1390-g rock sample of unknown concentration was dissolved in HCl and diluted to 100.0 mL. Aliquots of 10.00 mL of this unknown solution were added to different volumes of a 2.08 ?g/mL Ca standard solution and diluted to 200.0 mL. Find the weight percent of Ca in the rock sample and the associated uncertainty from the x-intercept using the method of least squares. Unknown (mL) / Standard (ml) / Final Volume (ml) / Emission Intenisty 10 / 0 / 200 / 221 10 / 5 / 200 / 407 10 / 10 / 200 / 631 10 / 15 / 200 / 825 10 / 20 / 200 / 1015
how much of the excess reactant remains after the limiting reactant is completely comsumed?
A 5.0 g sample of a hydrate of BaCl2 was heated, and only 4.3 g of the anhydrous salt remained. What percentage of water was in the hydrate?
total of 2.00 mol of a compound is allowed to react with water in a foam coffee cup and the reaction produces 149 g of solution. The reaction
Molecule with 3 single bonds and 1 lone pair of electrons around the central atom is predicted to have what type of molecular geometry? d. which of the following molecules is polar? PBr5, CCl4, BrF5, XeF2, XeF4 e. a sp3d hybridized central atom ha..
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You have 47.2 mL of a solution of copper(II) chloride (CuCl2?). You need to determine the concentration of Cu2+ in the solution gravimetrically.
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A compound has a C nmr spectrum with peaks at 7.4, 28.9, 36.4, and 208.8. The H nmr has peaks at 1.05 (t, .6), 2.13 (s, .58), 2.47 (q, .39). What is the compound?
A solution is made by mixing 500 mL of .167 M NaOH with 500 mL of .1 M CH3COOH. Calculate the equalibrium concentrations of H+. CH3COOH, CH3COO-, OH- and Na+
One cubic meter of ideal diatomic gas is expand from 150 degrees, 8 bar isothermally to the final volume. The gas is then cooled at constant volume until 50 degrees and 3 bar
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