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A 4.000 g sample of an unknown metal, M, was completely burned in excess O2 to yield 0.02225 mol of the metal oxide, M2O3. What is the metal?
a. Y
b. Ca
c. Al
d. Sc
what is the presentage compostition of both of the components, which is the limiting reagent (if there is) and what is the theoretical yeild of each of them.
Determine each of the following. 1) the initial pH? 2)the volume of added acid required to reach the equivalence point
the steam distillate contains a significant quantity of water, along with the cyclohexanone. how is the water removed from the steam distillate?
Elemental exonium (not a real element) consists of 2 major isotopes Abundance Mass 31% 95 amu,69%. 118 amu What is the atomic weight for exonium.
When one mole of hydrogen iodide(HI) is stored in a 1-liter container at 444 oC, 22 % of HI wil be dissociated at equilibirum. Calculate the equilibrium constant of the reversible reaction of hydrogen iodide (HI)at 444 oC.
When a mixture of PH3, P2, H2 comes to equilibrium at 873 K according to the reaction 2PH3 (g)= P2(g) +3H2(g) Kp=398 at 873K
The free radical chlorination of isobutane at 25C yields 64% isobutyl chloride and 36% tert-butyl chloride. However, free radical bromination of the same compound at 127C yields only trace amounts of isobutyl bromide and 99% of tert-butyl bromide
A 1.20 sample of dry ice is added to a 745 mL flask containing nitrogen gas at a temperature of 25.0 C and a pressure of 735mmHg .
If the volume of the container is reduced to 15.0 L and the pressure remains at 760 mm Hg total pressure. Calculate the temperature of the gas mixture
A mixture of 7.50 g He and 29.5 g Ne has a pressure of 540. mm Hg. What is the partial pressure of each of the gases?
Three pure compounds are formed when 1.00-{\rm g} samples of element X combine with, respectively, 0.472 {\rm g}, 0.630 g, and 0.789 g of element {\rm Z}. The first compound has the formula {\rm{X}}_2 {\rm{Z}}_3.
Calculate the energy difference (E) for the transition from n = 1 to n = 4 energy levels of hydrogen per 1 mol of H atoms.
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