Calculate the mass percentage of cobalt in Co3(PO3)2.

1 Calculate the mass percentage of cobalt in Co3(PO3)2. a. 55.6 percent b. 52.7 percent c. 18.5 percent d. 49.7 percent 2 A close chemical relative of the banned insecticide DDT is methoxychlor (C16H15Cl3O2). Methoxychlor is currently used as a home insecticide. Calculate the mass percent of oxygen in methoxychlor. a ...continues

Chemical Principles - Write the label of an orbital having the quantum numbers n=2, 1=1, m1=0.

1) Write the label of an orbital having the quantum numbers n=2, 1=1, m1=0. 2) Write the electron configuration for a gallium atom. 3) Write the electron configuration for a titanium atom. 4) Write a chemical equation corresponding to the third ionization energy of aluminum. 5) Write down the second period elements (ie. lith ...continues

Assorted General Chemistry Problems

1) In a combustion analysis, 2.00mg of vitamin C yielded 3.00mg CO2 and 0.816mg H2o. From mass spectrometry, it was found that the molecular weight of vitamin C is 176amu. Determine the mass composition of vitamin C, its empirical formula, and its molecular formula. 2) What is the energy of the photon that is emitted when the ...continues

Light and Quantum Numbers

1) What is the molar concentration of a solution that is made by dissolving 6.30g of sodium chloride and diluting 1.00L?Report your answer to three significant figures. 2) In an experiment, 6.00g of Mg(s) was reacted completely with O2(g) to form MgO(s) and 148.5kJ of heat was evolved. What is the molar emthalpy of formation ...continues

Molecular Geometry and Bond Order

1) What is the molecular geometry of the ammonium ion? 2) What is the molecular geometry of the SO2Cl2 molecule? 3) What is the approximate F-S-F bond angle in sulfur hexafluoride? 4) What is the hybridization of the central atom in COCl2? 5) What is the hybridization of the central atom in selenium tetrabromide? ...continues

Assorted General Chemistry Problems

1) List the following gases in order of increasing root-mean-square speed, all at the same temperature: H2, He, O2, Ne 2) Under what conditions of pressure and temperature is a real gas most expected to deviate from ideal gas behaviour? 3) What intermolecular interactions would be the strongest between molecules CH2Cl2? ...continues

Assorted General Chemistry Problems

1) Given the following data table of average bond enthalpies, estimate the ΔH^rxn for the reactions 2H2+O2-- 2H2O Bond Average (kJ/mol) H-H 436 O=O 498 H-O 423 2) Draw eight distinct, valid Lewis resonance structures for the molecule XeO3. 3) Which structure or structures is or are mo ...continues

Consider the reaction: NH3(g) + 2 O2(g) <--> HNO3(l) + H2O(l)

1. Consider the reaction, NH3(g) + 2 O2(g) <--> HNO3(l) + H2O(l), calculate K and ΔSº given the values below (all at 25 ºC): 1) 4 NH3(g) + 5 O2(g) <--> 4 NO(g) + 6 H2O K = 81 ΔSº = -124 J/mol K 2) 2 NO2(g) <--> 2 NO(g) + O2(g) K = 16 ΔSº = 120 J/mol K 3) 3 NO2(g) + H2O <--> 2 HNO3(l) + NO(g) K = 64 ΔS ...continues

Ozone Depletion Potential (ODP)

Please see attachment for the problem. Estimate the ODP (i.e.) Ozone Depletion potential for the following CFC alternatives relative to HCFC-22. and fill in the table with the ODP values. Justify the reasons for your ranking. Compound kOH × 1012 cm3 molecule-1 s-1 ODP CHF2Cl (HCFC-22) 1.2 exp (-1650/T) 0.05 CF3CH2F (HFC-134 ...continues

Jack and John Investment

Jack and John Investment Question Details: 1. Jack and John have an investment partnership. If Jack has invested $1200 and John has invested $800, what is the percentage of John's investment? 2. The desired pressure at the customer service connection in the distribution system is 45 psi. If you measure the pressure at the c ...continues