The boiling point constant for water is 0.51 Kkg/mol. Calculate boiling point of water in a solution gf 0.010 mol/kg of sugar and a solution of 0.010 mol/kg of NaCl.
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For the following reaction, 24.5 grams of diphosphorus pentoxide are allowed to react with 13.3 grams of water.
diphosphorus pentoxide (s) + water (l) -> phosphoric acid (aq)
what is the maximum mass of phosphoric acid that can be formed? _____ grams
what is the formula for the limiting reagent? ________________
what mass of the excess reagent remains after the reaction is complete? _______ grams
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A mixture of hydrocarbons (10mol% methane, 20 mol% ethane, 30mol% propane, 15mol% isobutane, 20 mol% n-butane, 5 mol% n-pentane) is flashed into a separator at 80 F and 150 psia. What fraction leaves the separator as liquid and what is its composition?
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A mixture of 1.397 g of H2 and 70.76 g of Br2 is heated in a 2.00 L vessel at 700. K. These substances react according to H2(g) + Br2(g) ↔ 2 HBr(g). At equilibrium the vessel is found to contain 0.592 g of H2. (a) Calculate the equilibrium concentrations of H2, Br2, and HBr. (b) Calculate Kc.
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What is the Lock signal? What nuclei generate the Lock signal?
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Which UV light hits earth's surface at the greatest intensity?
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Use Charles's law to complete the table. (Assume pressure and number of moles of gas to be constant.)
| Part | V1 | T1 | V2 | T2 |
| A | 119 L | 10.2 ∘C | __ | 106.4 ∘C |
| B | __ | 135 K | 173 L | 314 K |
| C | 2.15 L | 16.4 ∘C | 2.23 L | __ |
| D | 15.6 cm3 | __ | 18.2 cm3 | 10.1 ∘C |
A&B Express the volume in liters to three significant figures.
C&D Express the temperature in degrees Celsius to three significant figures.
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In acidic solution, the sulfate ion can be used to react with a number of metal ions. One such reaction is
SO42−(aq)+Sn2+(aq)→H2SO3(aq)+Sn4+(aq)
Since this reaction takes place in acidic solution, H2O(l) and H+(aq) will be involved in the reaction. Places for these species are indicated by the blanks in the following restatement of the equation:
SO42−(aq)+Sn2+(aq)+ −−−→H2SO3(aq)+Sn4+(aq)+ −−−
What are the coefficients of the reactants and products in the balanced equation above? Remember to include H2O(l) and H+(aq) in the appropriate blanks. Your answer should have six terms.
Enter the equation coefficients in order separated by commas (e.g., 2,2,1,4,4,3). Include coefficients of 1, as required, for grading purposes.
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Hi anyone can answar these questions or only part of them ?
1-What are the advantages of using thionyl chloride rather than other available chlorination agents?
2-When an oil bath is used to reflux a solution, why is it recommended ?
3-If charcoal is used in a recrystallization, how and why might Celite then be used subsequently?
4-Why is thionyl chloride removed by distillation at reduced pressure rather than at atmospheric pressure?
5-Illustrate the mechanism for the reaction of thionyl chloride and; (a) water and (b) a chiral alcohol.
6-Illustrate the mechanism of the reaction of cholesterol with PCl5 to yield 3-chloro-5-cholestene.
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Determine the Ph
0.120 M NaClO and 4.50×10−2 M KI
Express your answer using two decimal places.
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For each solution: a.) Calculate the molarity b.)Write a chemical equation representing the formation of a solution your equation should start with: CH3CH2OH----> c.) Draw a molecular picture of the solution showing ions , solute molecules and water molecules
Ethanol solution: 2.00 mL ethanol (d=0.789g/mL) to make 150. mL of solution
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Ammonium nitrate (NH4NO3) is a high explosive because it is unstable and decomposes into several substances as follows: _NH4NO3--> _N2 + _O2 + _H2O. Balance the equation and then find the number of grams of each product if 42.54g of ammonium nitrate reacted.
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Calculate air to fuel ratio by mass, for a four-cylinder SI engine running on i) gasoline and ii) a mixture of 20% methanol and 80% gasoline both at stoichiometric conditions. Assume gasoline is represented with C8H18 . Calculate any loss of power when gasoline-methanol mixture is used and discuss your results.
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36.
What is the net ionic equation for the acid–base reaction of hydrobromic acid with sodium hydroxide?
A)
NaOH(aq) + HBr(aq) → H2O(l) + NaBr(aq)
B)
Na+(aq) + –OH(aq) + H+(aq) + Br–(aq) → H2O(l) + Na+(aq) + Br–(aq)
C)
Na+(aq) + –OH(aq) + H+(aq) + Br–(aq) → H+(aq) + –OH(aq) + Na+(aq) + Br–(aq)
D)
–OH(aq) + H+(aq) → H2O(l)
Which salt forms a basic solution when dissolved in water?
A) KCl B) NH4Br C) LiNO3 D) Na3PO4
44.
A solution containing a low concentration HCl is a weak acid.
A) True B) False
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