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In the presence of excess thiocyanate ion, SCN-, the following reaction is first order in chromiumi (III) ion, Cr3+; the rate constant is 2.0 x 10-6/s.
If 85.00% reaction is required to obtain a noticeable color from the formation of the Cr(SCN)2+ ion, how many hours are required?
Determine the volume measured in a buret of a 0.2750M solution of HCl needed to consume all the calcium carbonate in a 2.5 x 1.0 x 0.5 in block. Density of CaCO3 es 2.71g/cm3.
A 38.8 L volume of methane gas is heated from 25°C to 72°C at constant pressure. What is the final volume of the gas
The element gallium has two naturally occurring isotopes with masses of 68.9300 amu and 70.9200 amu. What would be the fractional abundance of the first isotope, if the atomic weight was 69.6518 amu
The density of a liquid sulfur compound is 1.14 gmL1. This compound contains 23.7% sulfur. How many milliliters of the compound must be burned to obtain 6.40 g of SO2?
What volume (in mL) of 25.0 M hydrochloric acid is required to prepare the volume of 17.0 M hydrochloric acid you found you needed in A to neutralize 4.0 grams of aluminum (III) hydroxide
At its boiling point of -34.0 degree Celsius, 6.33 kJ of heat is required to vaporize 22.0 g of chlorine (Cl2). What is the molar enthalpy of vaporization of chlorine.
An external direct-current power supply is connected to two platinum electrodes immersed in a beaker containing 1.0 M CuSO4(aq) at 25°C, as shown in the diagram above
In which of the compounds CH4, NH3,H2O, SiH4, or H2S does hydrogen bear a partial negative charge
A groud state hydrogen atom absorbs a photon of light having a wavelength of 94.96 nm. It then gives off a photon having a wavelength of 95nm.
sulfuric acid h2so4 combines with sodium hydroxidenaoh according to the given equation as h2so4 naoh na2so4 h2o
what mass of sodium hydrogen carbonate sodium bicarbonate are required to completely react withneutralize 2.5 moles of
The pI can be estimated fairly accurately (within 0.1 or 0.2 pH units) from the pK values of all the proton dissociable groups in the peptide. Using pK values from the table at the right, estimate the pI value of the following hexapeptide
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