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The Platinum metal has a face centered cubic structure with an edge length of 3.924A. The alloy PT3Ir as well has a face centered cubic structure with and edge length of 3.969A. IN this structure, Ir atoms absorb the facial positions and Pt atoms occupy the corner positions.
Explain what the density of each material- Pt is and Pt3Ir?
A sample of neon gas used in a neon sign occupies a volume of 1.50 L at a pressure of 630 torr. Calculate the volume of the gas if the pressure in the glass tube of the sign is 793 torr.
the molar enthalpy of fusion delta h0 of ammonia is5.650 kjmol and the molar entropy of fusion delta s0of ammonia is
Calculate Keq for 2 moles of electron(s) in each half-reaction and a standard potential of 0.23 V
What wavelength is expected for light composed of photons produced by an n=3 to n=1 transition in a hydrogen atom
Exactly 37.2mL of hydrogen is collected over water at 29C and 745.0 torr. The vapor of water at 29C is 30.0 torr. Explain what is the volume of dry hydrogen collected at S.T.P
How much heat energy, in kilojoules, is required to convert 47.0 g of ice at -18.0 degrees C to water at 25.0 degrees C ?
How many grams of magnesium metal must be burned to release 500 kcal of heat according to the following reaction: 2 Mg (s) + O2 (g) ® 2 MgO (s) DH° = - 288 kcal
Calculate the amount of heat required to heat a 3.8kg gold bar from 27 degree celsius to 63 degree celsius.
The nickel-cadmium battery cell has a standard potential of +1.20 V. The cell reaction is: 2 NiO(OH)(s) + Cd(s) + H2O(l) --> 2Ni(OH)2(s) + Cd(OH)2(s) What is the standard free energy change for this reaction
A 1.80-g sample of a large biomolecule was dissolved in 21.0 g of carbon tetrachloride. The boiling point of this solution was determined to be 77.85°C
Calculate the molarities of HC2H3O2 and NaC2H3O2 in the buffer solution you will prepare in this experiment. The buffer solution consists of 50mL and 0.20M of NaC2H3O2 and consists of 10mL and 1.0M of HC2H3O2
A solution of 100 mL of 0.2 M NH3 is titrated with 50 mL of 0.5 M HNO3. What is the pH of the resulting solution? Kb for NH3 is 1.8 × 10-5.
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