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The molecular weight of a compound can be determined by proton NMR. The NMR spectrum of an unknown compound revealed that the compound had a total of six hydrogen atoms. A solution was prepared that contained 1.50g of the unknown and 1.45g of 1,3,5-trinitrobenzene as a reference compound. The integration of the NMR spectrum for the mixture gave 421 area units for the 1,3,5-trinitrobenzene peak and a total of 1240 units for the unknown. Calculate the molecular weight of the unknown.
The rare earth metal terbium is produced from terbium (III) flouride and calcium metal by a single replacement reaction. Given 27.5 g of terbium (III) flouride and 6.96 g of calcium, what is the theoretical yield (in grams) of terbium
one liter of a solution of ph 9 has how many hydroxyl ions oh- than 1 l of a solution of ph 4?a 10000 times moreb1000
Ksp for PbCrO4 at 25oC is 2.0 x 10-14. A sample of 1.000 mg of PbCrO4 is added to 1.0 L of water at this temperature.
germanium has the diamond cubic crystal structure. its radius is r0.122nm.within a supposed cubic unit cell of gea
Which electrode gains mass and which loses mass as the cell reaction proceeds? What is the equation for the equation for the overall cell reaction?
a buffer is made up of 355 ml each of 0.200 m nahco3 and0.134 m na2co3. enough water is added to thebuffer to make the
which of the following would have the lowest freezing point?a. 1 m cano3b. 0.1 m kno3c. 0.1 m hcld. 0.1 m sucrosee. 0.2
there are some given compounds ch3br rbf ch3oh co2arrange all these compounds in order of increasing boiling points and
A 585 g piece of copper tubing is heated to 97.2°C and placed in an insulated vessel containing 51.0 g of water at 26.0°C.
Calculate the pH after 0.020 mol of NaOH is added to 1.00 L of a solution consisting of 0.100 M HONH2 and 0.100 M HONH3Cl
A .100g sample of a carbon, hydrogen, oxygen compound was burned in a stream oxygen and produced 0.220 g CO2 and .239 g H2O. what is the mass percent of hydrogen in the sample
The equilibrium constant is always greater than one for an extensive reaction 6.The value of q is always equal to the value of w for a reversible reaction 7.The energy change of the universe for any spontaneous process is always positive
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