What volume at STP would be required to react with 0.100 mol of hydrogen to produce ammonia?
In: Chemistry
The hydroxide ion has the formula OH−. The solubility-product constants for three generic hydroxides are given here.
| Generic hydroxide | Ksp |
| XOH | 1.70×10−8 |
| Y(OH)2 | 2.70×10−10 |
| Z(OH)3 | 8.30×10−15 |
The removal of an ion is sometimes considered to be complete when its concentration drops to 1.00×10−6 M. What concentration of hydroxide would cause Y2+ to "completely" precipitate from a solution?
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what is the difference between the Gibbs energy of a reaction mixture and the Standard Gibbs energy of reaction.
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Calculate how to prepare 500 mL of 32.5 part per million KOH from a solution 50% of KOH with a density of 1.58 g/mL
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The pressure of a monatomic ideal gas doubles during an adiabatic compression. What is the ratio of the final volume to the initial volume (Vf/Vi)?
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The reaction of α-naphtylisocyanate with water results in the formation of urea, ArNHCONHAr. Outline a sequence of reaction to account for this product.
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When ammonia (NH3) reacts with fluorine, the products are gaseous dinitrogen tetrafluoride (N2F4) and hydrogen fluoride (HF).
b) How many moles of each reactant are needed to produce 2.96 moles of HF?
c)How many grams of F2 are required to react with 40.2 g of NH3?
d)How many grams of N2F4 can be produced when 5.71 g of NH3 reacts?
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An enzyme is 90% destroyed after a thermal treatment of 74oC for 5 h. What is the destruction decay of this enzyme in UHT conditions (135oC, 4 s), knowing that its decay rate is z=32oC?
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In: Chemistry
why does nuclear over hauser effect do not produce large increase in intensity for hydrogen when carbons are irradiated
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A 0.400 g sample of toothpaste was boiled with a 25 ml solution TISAB buffer to extract the fluoride. After cooling, the solution was diluted to exactly 100.0ml with more TISAB solution. The potential of fluoride ion-selective electrode/reference electrode in an aliquot of the sample was measured to be 186.6 mV. This value corresponding to a log[F-] of -3.5016 on a working curve of mV versus log [F-]. Calculate the weight percent F- and NaF in the toothpaste sample.
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A 2.67 g sample of plant tissue was analyzed for its zinc content. 23.25 ml of a standardized 0.010 Molar solution of EDTA was used to titrate the sample (by complexing with the zinc ions), determine the mass of zinc in the sample and express the value as;
a. ppm zinc?
b. ppb zinc?
c. What mass of zinc product would form if the zinc (2+) ions were instead allowed to precipitate as zinc phosphate?
3Zn2+(aq) + 2PO43-(aq)Zn3(PO4)2(s)
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Calculate the volume of oxygen produced (measured at standard temperature and pressure - STP) at the anode during the electrolysis of sodium sulfate solution, if the electrolytic cell is operated at a current of 2.50 amperes for 45 minutes.
F = 9.65 x 104 C mol-1 (or 96,500 C mol-1). The molar volume of a gas at STP = 22.4 L mol-1 the two possible reactions at the anode are;
O2(g) + 2H2O(l) + 4e- 4OH-(aq) E = 0.40V
SO42- (aq) + 4H+(aq) + 2e- 2H2SO3(aq) + H2O(l) E = 0.20V
In: Chemistry
a. Calculate the pH of a buffer that is prepared by completely dissolving 0.0401 g of NH4Cl in exactly 25.0 ml of a 0.020 Molar aqueous NH3 solution.
b. What is the pH after 5.0 mL of 0.020 M NaOH solution is added to 0.020 L of this buffer?
In: Chemistry
Gaseous phosphorus pentachloride decomposes according to the reaction
PCl5 (g) ⇌ PCl3 (g) + Cl2 (g)
The equilibrium system was analyzed at a particular temperature, and the concentration of the substances present were determined to be [PCl5] = 1.1 x10-2 M, [PCl3] = 0.325 M, and [Cl2] = 3.9 x 10-3 M. Calculate the value of K for the reaction.
In: Chemistry