In: Chemistry
In: Chemistry
How many air molecules are in a 11.5×12.0×10.0 ft room? Assume atmospheric pressure of 1.00 atm , a room temperature of 20.0 ∘C , and ideal behavior?
Volume conversion:There are 28.2 liters in one cubic foot.
In: Chemistry
What mass of F2 would have the same number of diatomic molecules as there are hydrogen atoms in 20 grams of ammonia(NH3)?
In: Chemistry
Chemical Engineering. The product gas from a coal
gasification plant consists of 60.0 mole % CO and the balance H2;
it leaves the plant at 150° C and 2000 psia. The gas expands
through a turbine, and the outlet gas from the turbine is fed to a
boiler furnace at 100° C and 1atm at a rate of 15,000 ft^3/min.
Estimate the inlet flow rate to the turbine in ft^3/min using Kay's
rule. What percentage error would result from the use of the ideal
gas equation of state at the turbine inlet?
Please show work.
In: Chemistry
Calculate ?H (298 K) per gram of fuel units of kJ*g^-1 (exclude oxygen)
a.) H2(g) + O2(g) = H2O(g)
b.) CH4(g) + 2O2(g) = CO2(g) + 2H2O(g)
c.) CH3OH(l) +3/2 O2(g) = CO2(g) + 2H2O(g)
d.) C6H14(g) + 9 1/2 O2(g) = 6CO2(g) + 7H2O(g)
In: Chemistry
Calculate ΔE° for the following equation (with solutions):
3Br2 + 2Cr3+ + 7H2O = Cr2O2-7 + 14H+ + 6Br-
In: Chemistry
Consider the titration of 42.0 mL of 0.270 M HF with 0.215 M NaOH. Calculate the pH at each of the following points.
a) How many milliliters of base are required to reach the equivalence point?
b) Calculate the pH after the addition of 10.5 mL of base
c) Calculate the pH at halfway to the equivalence point.
d) Calculate the pH at the equivalence point.
e) Calculate the pH after the addition of 84.0 mL of base.
In: Chemistry
Vitamin C and E are powerful antioxidants. (a) What are the oxidized forms of vitamin C and E? (b) What is the product for vitamin C and E reacting with radical RO2∙? (c)What are the differences between vitamin C and E as an antioxidant? (d)Which one is a stronger radical scavenger than the other? please help me with the detail answers, thx
In: Chemistry
Consider the gas phase reaction H2 + I2 = 2HI at equilibrium at T= 870 K and p = 1 bar. If ∆G˚ (870K, 1 bar) = - 48.96 kJ, determine K, ξ and the equilibrium amounts of H2, I2 and HI (in mol) if the intial composition was n˚(H2) = 0.300 mol, n˚(I2) = 0.400 mol, and n˚(HI) = 0.200 mol
In: Chemistry
Part A
Calculate the equilibrium constant at 25 ∘C for the
reaction
Ni(s)+2Ag+(aq)→Ni2+(aq)+2Ag(s),
if
Ni2+(aq)+2e−→Ni(s), E∘
= -0.26 V,
Al+(aq)+e−→Al(s), E∘ =
0.80 V
Express your answer using one significant figure.
Part B
Calculate the equilibrium constant at 25 ∘C for the
reaction
Hg2+2(aq)→Hg(l)+Hg2+(aq)
See Appendix D for standard reduction potentials.
Express your answer using one significant figure.
In: Chemistry
Which of the following statements about quantum theory is incorrect?
|
a. |
The energy and position of an electron cannot be determined simultaneously. |
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b. |
Lower energy orbitals are filled with electrons before higher energy orbitals. |
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c. |
When filling orbitals of equal energy, two electrons will occupy the same orbital before filling a new orbital. |
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d. |
No two electrons can have the same four quantum numbers. |
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e. |
All of these are correct. |
The answer is C for Hund's rule but why A is correct?
I think that the uncertainty principle is about [ position-momentum ] and [ time-energy ] .
In: Chemistry
Explain the general concept of a force field in molecular modelling and explain why it might be used instead of a first-principles method.
In: Chemistry
What answer should be reported, with the correct number of significant figures, for the following calculation (249.36+ 41.3)/63.7?
In: Chemistry
1.Why doesn’t initiation occur in the micelles in emulsion polymerization?
2.Describe a gel for drug release.
In: Chemistry