Chemistry question and answers for August 27, 2023
- Q 1.) What is the pH of a solution created by combining 1.34 moleof HOBr and 0.47 mole NaOH in a 1.00L solution? Ka HOBr= 2.5 x 10-92.) What is the...
- Q Given that the density of air at 0.987 bar and 27°C is 1.146 kgm−3, calculate the mole fraction and partial pressure ofnitrogen and oxygen assuming the following conditions.(a) air consists...
- Q Physical Chemistry:Calculate ΔG for the isothermal compression of 10.0 g of waterfrom 1.0 atm to 100.0 atm at 25°C
- Q Calculate the mass of methane that must be burned to provideenough heat to convert 266.0 g of water at 39.0°C into steam at110.0°C. (Assume that the H2O produced in the...
- Q What is the total enthalpy change when 100.0 g of solid NH3 at-150.0 degrees Celcius is changed to gas at 100 degreesCelcius?I've done this problem several times and keep getting...
- Q Determine the oxidation states of carbon in the followingsubstances.CH4Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â _________CH2Cl2Â Â Â Â Â Â Â _________SiCÂ Â Â Â Â Â Â Â Â Â _________ Â Â CF2Cl2Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â _________C2H6Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â _________Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â C(s)Â Â Â Â Â Â Â Â Â Â Â _________C4H10Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â _________C6H12O6 Â Â Â _________CH3CHO Â Â ________COÂ Â Â Â Â Â Â Â Â Â Â Â _________C2H4Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â _________CO2Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â _________C2H2Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â _________CO32 -Â Â Â Â Â Â Â Â Â Â Â Â Â Â _________
- Q 1)A balloon containing 1.75 miles if He gas has a volume of 0.500L ata given temperature and pressure. If balloon loses some amount ofhelium gas without changing temperature and pressure...
- Q The enthalpy of fusion of titanium is 20.9 kJ/mol. How manygrams of titanium can be melted by adding 58.0 kJ of energy to themetal at its melting point?
- Q What is the pH at the equivalence point in the titration of a21.2 mL sample of a 0.319 Maqueous nitrous acid solution with a0.408 M aqueous potassiumhydroxide solution?
- Q For the diprotic weak acid H2A, Ka1 = 2.2 × 10-6 and Ka2 = 8.3 ×10-9. What is the pH of a 0.0700 M solution of H2A? What are theequilibrium...
- Q What is the pH of a 0.055 M solution of sodium cyanide(NaCN)? The Ka value for hydrocyanic acid (HCN)is 6.2 x 10-10.Select one:a. 10.97b. 10.08c. 8.77d. 3.03e. 5.23
- Q Choose the correct definition for an intrinsic semiconductorwith an example.1. a conductive material of an element with the addition ofdopant (0.0001% Si in Al )2. a conductive material of an...
- Q Methanol (CH3OH) is made by reacting gaseous carbonmonoxide (CO) and gaseous hydrogen (H2).A. What is the theoretical yield of methanol ifyou react 37.5 kg of CO(g) with 4.60 kg of...
- Q Match Column B Items with Column A Items ( match B is from A-iwill be matched with column A)Column A______Reagents used to prepare the nonMarkovnikov product______Reagent used to prepare an...
- Q 31. Which of the following describes the distribution of thepolar and nonpolar portions of lipids in the lipid bilayer? A).Both polar heads are on the inside of the bilayer and...
- Q Determine Delta G for thefollowing reactions.a) Antimony pentachloride decomposes at 448oC. The reaction is:SbCl5(g)-->SbCl3(g)+Cl2(g)An equilibrium mixture in a 5.00 L flask at 448oC contains 3.85gof SbCl5, 9.14g of SbCl3, and...
- Q compute the following:(a) Calculate the wavelengths for the Paschen series forHydrogen(b) If the average speed of a Hydrogen electron is 4.0*10^6 m/swith a 0.95% uncertainty. What is the uncertainty of...
- Q Determine the pH of a solution when 21.5 mL of 0.021 M HNO3 ismixed with 17.5 mL ofA) 0.0070 M NaOH.B) distilled water.C) 0.0070 M HClD) 0.084 M KOH.
- Q Cryogenic liquids (liquid N2, He, etc) are typically stored inDewar flasks (fancy thermos bottles) that consist of mirrored glasswalls (to reduce radiative heating) separated by vacuum (a cylinderwithin a cylinder)....
- Q This question is based on the mass spectrum of diethyl sulfide(CH3CH2SCH2CH3) which can be found at this link...http://webbook.nist.gov/cgi/cbook.cgi?ID=C352932&Mask=200 Youwill need java to see this spectrum! Identify the ion fragment thathas...
- Q Part A. What mass of carbon dioxide is produced from thecomplete combustion of 5.70×10−3 g of methane?Part B. What mass of water is produced from the completecombustion of 5.70×10−3 g...
- Q What is the role of kinetic energy quantization in covalent bondformation? [keywords: particle-in-a-box, length, quantum state,energy, kinetic, hydrogen atom, hydrogen molecule, covalent bondenergy...]
- Q calculate the de Brolie wavelength for a molecule of (Ch_4) at-5degree c.
- Q How do quantum mechanics and numbers play into bothBohr's model of the atom and Heisenburg's model?
- Q .  Draw a block flow diagram for apetroleum refinery that includes three differentseparation processes, five different conversionprocesses along with one or more finishing processes, andone supporting process to produce altogether...
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