Rate Constant with Temperature Changes
Rearrangement of methyl isonitrile to acetonitrile has activation energy of 25.0 kJ/mol and a rate constant of 8.1*10^-4s-1 @ 80 Celsius. what is the value of the rate constant @ 255.0 celsius?
Physical Chemistry
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Half-life of first order process
A reactant undergoes a dissociation reaction A r arrow 2B which follows first order kinetics. The initial concentration of reactant A is .4000 M and after 75.00 hr the concentration of A decreases to 0.0816 M. Determine the half-life of the first order process. There must be a simple equation for this, but my textbook must a
Finding ph
?hat is the pH of a solution in water with a concentration of H3O+ ion of 3.5x10-8M. ?Is this solution acidic or basic? ?A solution in water has a pH of 5.25. What is the molarity of H3O+ ion in this solution? Question also attached
Mathematics of pH Acidity
If 50.0 mL of a 0.1 solution of HOAc (Ka = 1.8 x 10^-5) has been titrated to the equivalence point with 0.1 M NaOH solution, what is the pH of the resulting solution? Please explain the math. Thanks.
Level of pH Acidity
Calculate the pH of a 1.0 M solution of NH4Cl with the following parameter given: Kb=1.8 x 10^-5 for NH3
Balancing a Disproportionation Reaction
Balance the following reactions: Pb(s) + PbO2(s) + H2SO4 --> PbSO4(s) H3AsO4 + Zn(s) --> As + Zn^+2 O3 + NO --> O2 + NO2
Amount of natural gas burned is proportional
nt of natural gas burned is proportional to the amount of oxygen consumed. if 24.0 kg of oxygen is consumed in burning 15.0 kg of natural gas, how much air, which is 23.2% oxygen by weight, is consumed to burn 50.0 kg of natural gas? a. 80.0 kg b. 345 kg c. 31.3 kg d. 135 kg
Balance and Total Ionic Equations
If doing by hand, please write dark on paper before scanning. Balance and do total net ionic equations Please explain math ... __NaCNS +__ KmnO4 +__H2SO4 arrow __K2SO4 + __MnSO4 + __NaCN +__H2O __Cu + __HNO3 __Cu(NO3)2 + __ NO + __H2O __U3O8 +__ H2SO4 arrow __UO2SO4 + __U(SO4)2 + __H20 __BrO3^-1 + __AsO3^-3 arrow __
Explain, Balance and Net Iconic Equation
Balance and do net ionic equation Explain Acidic: __Ag+__NO3^-1__Ag^+1 +__NO __IO4^-1 + __I ^-1 __I2 __Cr2O7-2 + __I-1 ® __Cr+3 + __I2 __P + __NO3^-1 __NO + __H3PO4 __SeO4^-2 +__ Cl^-1 SeO3^-2 + __Cl2 __Cr^+3 + __ClO3^-1 __CrO4^-2 + __Cl^-1 __Br2 arrow __Br^-1 + __BrO3^-1.
Determine pH and POH From the Given Equation
pH and POH needed: Please show work. 0.4 NH4ClO4 Ka=1.0x10^-14 Kb=1.8x10^-5.
Oxidation and reduction - arranging reactions in order
I am having trouble with this question: i) A reacts spontaneously with 1 mol/L BNO3, 1 mol/L D(NO3)2 and dilute sulfuric acid. A does not react with 1 mol/L C(NO3)2 ii) B does not react spontaneously with any of the 1 mol/L solutions above or with dilute sulfuric acid. iii) C reacts spontaneously with dilute sulfuri
Calculating the solubility product constant
Please explain: Calculate the Ksp value for Bi2S3 which has a solubility of 1.0 x 10^-15 mol/L @ 25 degrees C.
Order of Sample Equation
Please explain order: 1.24 = K[4.42]^n [1.00]^m / o.169 = K[2.21]^n [1.00]^m The answer is overall 2nd order- why?
Soluble Salt Functions
Please explain which of the following salts is most soluble? CuS(s) Ksp = 8.5 x 10^-45 Ag2S(s) Ksp = 1.6 x 10^-49
Lewis Acid or Lewis Base
Determine if each of the following are Lewis acids or Lewis Bases. NH3 H^+1 AlCl3 Cl^-1.
Solve for pH, pOH and H.
If a solution has an OH = 7.40 x 10^-8, what is its pH, pOH and its H?
Calculating pOH, H Positive and OH
If a solution has a pH = 3.45, what is its pOH, its H positive, and its OH?
Molarity Equation
How many milliters of 0.1500M NaOH can be made from 250.0 mL of 6.000M NaOH?
Molarity and Normality
50.00 mL of 0.2500M H2SO4 is titrated to a neutral endpoint with 56.03 mL of LiOH. What is the molarity and normality of the LiOH?
Calculating pOH and pH.
Calculate the pOH and pH at 298K of solutions having the following ion concentrations: OH = 1.3 x 10^-2 M.
Calculating concentration of an ion
Given the concentration of hydroxide ions, use the ion product constant of water to calculate the concentration of the other ion at 298 K. OH = 1.3 times 10 to the negative 2 power M
Value of PV
What is the change in the value of PV when a gas is cooled by expansion or diffusion?
Finding Number of Atoms in a Molecule from Molecular Weight
As determined from the gas law, the molecular weight of a substance is eight times the atomic weight. How many atoms are in a molecule of the substance?
Supercritical Fluid Defined
Define Supercritical fluid. Give an example and it's properties. Which fundamental thermodynamic property is important to the solubility of an analyte in supercritical fluid?
Molecular Weight of Neon and Mole Concept
What weight of neon exerts a pressure of 20atm when confined to 2 liters at a temp of 100C?
Calculate Energy Required to Heat Water
Calculate how much energy is required to heat 100 g of ice at 0 degrees Celsius to steam at 100 degrees Celsius. Draw a diagram of temperature versus time for water being heated. Heat of fusion of water = 6.02 kJ/ mole Heat capacity of liquid water = 4.18 J/degree Celsius x g Heat of vaporization of water = 40.7 kJ/ m
Thermal equilibrium
10.0g of Fe(s) at 98.0 degrees Celsius is placed in 50.0mL of H2O(l) at 20 degrees Celsius. Assuming no energy is lost to the surroundings what is the final temperature of Fe(s) and H2O(l) at thermal equilibrium?
Assign oxidation states for all atoms in each of following compounds
A) UO2<+2> b) As2O3 c) NaBiO3 d) As4 e)P4O6 f) Mg2P2O7 g) Na2S2O3 h) Hg2Cl2 i) Ca(NO3)2
Balance an ionic and net ionic equation
1) AgNO3 + NaBr = 2) BaI2 + ZnSO4 = 3) Na2CO3 + MgCl(Chlorine)2 = 4) KOH + H3PO4 = 5) HCl + Fe(OH)3 =
Balancing using the half reaction method in an acid
Balance using the half reaction method in an acidic solution: Cr(NCS)6<4->(aq) + Ce<4+> (aq) = Cr<3+>(aq) + Ce<3+> (aq) + NO3<->(aq) + CO2 (g) + SO4<2->(aq)