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An organic acid has a molecular weight of 192. A 100 mg sample of this acid was burned in an excess of oxygen in the apparatus. The only compounds that make up this acid are carbon, hydrogen and oxygen. In the U tube apparatus, 137.53 mg of carbon dioxide was caught and 37.8 mg of water was caught. Determine the exact formula of the acid. Make sure that the formula weight equals 192.
1. C4H16O8
2. C8H16O5
3. C7H12O6
4. C7H2O7
5. C6H8O7
A student mixes 5.0 mL 2.00 x 10-3 M Fe(NO3)3 with 4.0 mL 2.00 x l0-3 M KSCN, and 1.0mL deionized water. She finds that in the equilibrium mixture the concentration of FeSCN2+ is 1.2 x l0-4 M.
Which of the following would be expected to have the lowest vapor pressure at room temp. a-Ethanol, bp= 78C b- methanol, bp= 65c c- water, bp = 100C d- acetone, bp= 56C
A piston at 5145 torr contains a gas that occupies a volume of 4.7 L. What pressure would have to be placed on the piston to force the volume to adjust to 0.1 L
If 1.0 l of 0.10 M sodium phosphate is mixed with 1.0 l of 0.10 M magnesium nitrate, magnesium phosphate is produced. Calculate the concentration of each ion when the reaction is finished and the mass of precipitate.
If 18.4 mL of 0.800 M HCl solution are needed to neutralize 5.00 rm mL of a household ammonia solution, what is the molar concentration of the ammonia?
Tell whether each of the experimental errors in excercise will affect the melting point of the unknown component.
A gaseous compound containing hydrogen and carbon is decomposed and found to contain 85.63% C and 14.37 H by mass. The mass of 258 mL of the gas, measured at STP is 0.646 g. What is the molecular formula of the compound?
A compund with the formula c15h14o has a strong peak near 1720 cm-1 in the IR. The HNMR spectrum shows a 3H singlet at sigma 5.08, and a 10H multiplet at sigma 7.25. Draw the compund
A certain substance, intially present at 0.950 M, decomposes by first-order kinetics with a rate constant of 1.25 x10-2 mol m-1 s-1. calculate the time (in seconds) required for the system to reach a concentration of 0.431M
calculate the values of ?Ho, ?So, and ?Go for the reaction at a pressure of 1 atm and temperature of 298.15 K. C(graphite) + H2O(g) = CO(g) + H2(g)
vessel is filled with .202 mol of NO and .202 mol of O3 at 366K. Find the partial pressure of each produce and the total pressure in the flask at the end of the reaction.
Calculate the [H+], pH, and pOH in each of the following solutions in which the hydroxide ion concentrations are A) 0.0068M B) 6.4 X 10^-5M C) 1.6 X 10^-8M D) 8.2 X 10^-12M
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