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A compound containing only C, H, and O, was extracted from the bark of a sassafras tree. The combustion of 91.3 mg produced 248 mg of CO2 and 50.8 mg of H20. The molar mass of the compound was 162 g/mol. Determine its empirical and molecular formulas.
draw structural formula for protien synthesis by the sugar arrangement using AATCGTATGG
how many moles of H30 or 0H must you add to a liter of a solution of a weak acid to change its pH from 3.25 to 3.65
A titration was performed between 25 mL of 0.100 M NH3 and 0.100 M HCl. Calculate the pH of NH3 solution at the following points during the titration.
Determine the mass of the hydrate and the mass of the sulfate after removing the water. 2. Calculate the number of moles of water and the number of the moles of the anhydrous sulfate
A solution is 0.0100 M in Pb2+ ions. If 0.103 mol of solid Na2SO4 is added to 1.00L of this solution (with negligible volume change), what percent of the Pb2+ ions remain in solution.
An electron in an excited state of a hydrogen atom emits two photons in succession, the first at 1281 nm and the second at 102.5 nm, to return to the ground state (n=1).
In an experiment conducted last Tuesday, the time it takes for a certain reaction to proceed seems to be related to the initial concentration of one of the reactants A.
Draw graphs representing Boyle's law, Charles's law, and Gay-Lussac's law for a fixed amount of gas. Make sure that you label each axis and state the assumptions for each law-that is, the variable(s) that is (are) held constant for each law.
Water's heat of fusion is 80. cal/g, and its specific heat is 1.0 cal/g.celsius. Some velomobile seats have been designed to hold ice packs inside their cushions.
What is the final temperature (in oC) of a 37.6 g sample of graphite (specific heat = 0.720 J/(g K)) which absorbs 9.82 kJ of heat when it warms from 12.56oC
Calculate the concentration of the acetate ion (mol/L) in a solution prepared by dissolving 1.00×10-2 mol of HCl(g) in 1.00 L of 9.00×10-1 M aqueous acetic acid. Equilibrium constants may be found in an appendix to your text.
Global warming refers to the rise in average global temperature due to the increased concentration of certain gases, called greenhouse gases, in our atmosphere.
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