Chemistry question and answers for July 04, 2023
- Q Part A. Calculate the enthalpy of the reaction2NO(g)+O2(g)?2NO2(g)given the following reactions and enthalpies of formation:12N2(g)+O2(g)?NO2(g),   ?H?A=33.2 kJ12N2(g)+12O2(g)?NO(g),  ?H?B=90.2 kJPart B. Calculate the enthalpy of the reaction4B(s)+3O2(g)?2B2O3(s)given the following pertinent information:B2O3(s)+3H2O(g)?3O2(g)+B2H6(g),    ?H?A=+2035kJ2B(s)+3H2(g)?B2H6(g),                            ?H?B=+36kJH2(g)+12O2(g)?H2O(l),                ?H?C=?285kJH2O(l)?H2O(g),                                          ?H?D=+44kJ
- Q Question #: 9 How much energy is required to warm 90.1 g (5.00mol) of H2O(s), initially at –19.4 oC, to H2O( l) at 100.0 oC?melting point = 0.00 oC boiling...
- Q Calculate the mass of oxygen gas (O2) dissolved in a5.00 L bucket of water exposed to a pressure of 1.13 atm of air.Assume the mole fraction of oxygen in air...
- Q Suppose the total pressure in a bottle of soda water before itis opened is 40 psig(http://hypertextbook.com/facts/2000/SeemaMeraj.shtml) and that thegas mixture is 75% CO2 and 25% other gases. The temperature is10°C....
- Q The pH of a water is measured to be 7.0. The concentration ofbicarbonate was measured to be 1.3*10^-3 M. What are theconcentrations of carbonate, carbonic acid, and CT (totalcarbonates)? Assume...
- Q suppose you run electrolysis for 20.26 minutes at an averagecurrent of 146.1 milliamperes. how many coulombs pass through yourelectrolysis cell? How many electrons?(1 COULOMB= 1 AMPERE*1 SECOND)
- Q If the Ka of a monoprotic weak acid is 3.8 × 10-6, what is thepH of a 0.11 M solution of this acid?
- Q What is the pH of the product resulting from the reaction of aweak base and a weak acid?A)acidicB)basicC)neutralD)cannot be determined
- Q Consider the manufacture of aspirin. Low-dose aspirin tabletsare formulated to contain 81 mg of aspirin. How many kilograms ofaspirin should the manufacturer produce in order to make 3000.low-dose aspirin tablets?
- Q The specific rate constant for the first-order decomposition ofN2O5(g) to NO2(g) and O2(g) is 7.48×10−3s−1 at a given temperature.Find the length of time required for the total pressure in a...
- Q If the complete reaction with 0.8642 (plus or minus 0.0005) g ofsodium carbonate (FW= 105.9884 plus or minus 0.0007) required 42.36(plus or minus 0.04) mL of acid, what is the...
- Q The specific rate constant for the first-order decomposition ofN2O5(g) to NO2(g) and O2(g) is7.48×10−3s−1 at a given temperature.1. Find the length of time required for the total pressure in asystem...
- Q 1. Pol ε is used for ____________strand synthesis and Pol δ isused for __________ strand synthesis.2. What is the role of PCNA in DNA replication?3. What is an “epitope tag�4....
- Q CS2 is a commonly used nonpolar solvent and has a vaporpressure of 0.45 MPa at 100C and 0.782 MPa at 125C.A. Calculate the normal boiling temp of CS2 based on...
- Q If the partial pressure of hof in a 1.00-L flask is initially at25 °C, what are the total pressure in the flask and the partialpressure of after exactly 35 minutes?...
- Q The diffusion coefficients for copper diffusing in gold aregiven at two temperatures (hint: logarithm):T(K)D(m2/s)12739.4 x 10-1614732.4 x 10-14(a) Determine the values of D0 andthe activation energy Qd?(b) What is the...
- Q Take the volume change into account and calculate ΔH and ΔU forexactly 1 g of ice melting into 1 g of water at standard pressure.The density of ice at 0˚C...
- Q the first order rate constant for the decomposition of N2O5,2N2O5(g)->4NO2(g)+O2(g)at 70C is 6.82x10^-3 s^-1. suppose we start with 3.00x10^-2 molof N2O5(g) in a volume of 2.3LA) how many moles of...
- Q 1. Establish the differences between concentration andactivity.2. Discuss the advantages and limitations of using an ISE forquantitative applications.
- Q How can you tell how many different types of Carbon and Protonsare present in a compound?
- Q describe and explain the possible effect on your results of thefollowing experimental errors or vibrations. In each case, specifythe component(s) whose percentage(s) would be too high or too lowif:a.)After adding...
- Q Determine the molar solubility (S) of Ag2CO3 in a bufferedsolution with a pH of 3.167 using the systematic treatment ofequilibrium. Ksp(Ag2CO3) = 8.46 × 10–12; Ka1(H2CO3) = 4.45 × 10–7;Ka2(H2CO3)...
- Q Given that the vapor pressure of water is 17.54 Torr at 20 °C,calculate the vapor-pressure lowering of aqueous solutions that are2.50 m in (a) sucrose, C12H22O11, and (b) calcium chloride....
- Q Amino acids are the building blocks of proteins, and can act asboth a Brønsted acid and a Brønsted base through intramolecularproton transfer (see Chapter 16, pg. 709 of the textbook)....
- Q Given 319.5 g of hot tea at 72.0 ∘C, what mass of ice at 0 ∘Cmust be added to obtain iced tea at 13.5 ∘C? The specific heat ofthe tea...
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