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July 30, 2014

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

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Chemistry
Balance the following equation in basic solution. Phases are optional. I{-}+IO4{-} --> I3{-}+IO3{-}
Monday, April 14, 2014 at 9:48pm

CHEMISTRY HELP !!!! Show work please!
Compute the energy released in kilojoules when the sun converts 1.00 metric ton into energy. NOTE: 1 metric ton = 1000 kg.
Monday, April 14, 2014 at 8:55pm

chemistry help~~~~ Please!!!
Sodium-24, t1/2 = 15.0 hr, can be used to study the sodium balance in animals. If a saline solution containing 25 μg of 24^Na is injected into an animal, how long can the study continue before only 1 μg is left? Show work please!
Monday, April 14, 2014 at 8:54pm

Chemistry-need help ASAP
15 ml of 3.0 M NaOH are added to the following: 500.0 ml of pure water 500.0 ml of 0.1 M formic acid 500.0 ml of 0.1 M formate of potassium 500.0 ml of a solution containing 0.1 M formic acid and 0.1 M formate of potassium. Calculate the difference of pH resulting from the ...
Monday, April 14, 2014 at 8:40pm

Chemistry
Titration of 50.0 ml of acetic acid reaches equivalence after delivery of 22.5 ml of standardized NaOH 0.21 M. What is the initial concentration of acetic acid and what is the pH of the solution? What is the pH at equivalence? What is the pH after addition of 20.0 ml of NaOH? ...
Monday, April 14, 2014 at 8:38pm

Chemistry
Balance the following redox (oxidation-reduction) reaction under basic conditions. (Include states-of-matter under the given conditions in your answer. Use the lowest possible whole number coefficients.) CrO42−(aq) + S2O32−(aq) → Cr3+(aq) + SO42−(aq)
Monday, April 14, 2014 at 6:52pm

Chemistry
For the balanced redox reaction 2 Al(s) + 3 Br2(g) → Al2Br6(s), determine the number of electrons transferred in the overall reaction.
Monday, April 14, 2014 at 5:34pm

chemistry
Adding a complex ion forming species to a solution will increase the solubility of a slightly soluble species. Calculate the Molar solubility (s) of AgI in a 1.75 M ammonia solution. The Ksp for AgI is 8.3 x 10-17 and the Kf for Ag(NH3)2+ is 1.5 x 107. I have tried getting ...
Monday, April 14, 2014 at 5:22pm

Chemistry
Under acidic conditions, MnO4− becomes Mn2+. Write the balanced half-reaction for this transformation. (Omit states-of-matter from your answer.)
Monday, April 14, 2014 at 4:27pm

Chemistry
Based on the mechanisms that you have determined and the information in the introduction, what is the product of 1-cholorobutane after reaction under the sodium iodide conditions? The ethanolic silver nitrate conditions?
Monday, April 14, 2014 at 3:17pm

Chemistry
In the SN2 mechanism, considering that the nucleophile attacks at the same time as the leaving group leaves, what would the effect of having a hindered (crowded) reaction center be on the rate of the reaction? Would you expect it to react slower or faster than an unhindered ...
Monday, April 14, 2014 at 3:16pm

chemistry 2
Titration of 50.0 mL of acetic acid reaches equivalence after delivery of 22.5mL of standardized NaOH 0.21 M. What is the initial concentration of acetic acid and what is the pH of the solution? What is the pH at equivalence? What is the pH adition of 20.0 mL of NaOH? What ...
Monday, April 14, 2014 at 2:31pm

Chemistry
212 84Po→208 82Pb+AZX What would the value of A be here? 212 84Po→208 82Pb+AZX what would the value of z be here?
Monday, April 14, 2014 at 1:26pm

Chemistry
Write a nuclear equation for the indicated decay of each of the following nuclides. Th−234 (beta)......no clue O−15 (positron emission): 16/8 O-->16/7N + B+ (said was wrong) Ar-37: 37/18Ar + e ---> 37/17Cl + v (said was wrong) what would be the proper equations?
Monday, April 14, 2014 at 1:24pm

Chemistry
A solution of I2 was standardized with ascorbic acid. Using a 0.0500 g sample of the acid, 26.50 mL of I2 were required to reach the starch end point.
Monday, April 14, 2014 at 9:25am

chemistry
Assume that no heat is lost to the surroundings and calculate the enthalpy involved when 200. mL of .10 M potassium hydroxide and 200. mL of .10 M hydrochloric acid are mixed. Both solutions began at room temperature, 24.5 degrees celsius, and have densities very close to 1.00...
Monday, April 14, 2014 at 9:23am

Chemistry - Science (Dr. Bob222)
Consider reaction below: 50H3O^+(aq) + 7Cr2O7^2-(aq) +3I_2(aq) --> 6IO_4^-(aq) + 14Cr^3+(aq) + 75H2O (l) How many electrons are transferred in this reaction?
Monday, April 14, 2014 at 6:00am

Chemistry
A 0.170-mole quantity of CoCl2 is added to a liter of 1.20 M NH3 solution. What is the concentration of Co2 ions at equilibrium? Assume the formation constant (Kf) of Co(NH3)62 is 5.0× 1031 M–6. I don't really know how to start. At first I thought about setting ...
Monday, April 14, 2014 at 5:04am

Chemistry, CO2 aq+H2O->H2CO3!
How many grams of CO2 are needed to neutralize a 5 liters water with a pH of 11 to 7? under the following conditions: P: 4000 psi, T:230 oF Note: CO2 is a one of oil reservoir fluid components with mole percent 0f 3.6%. thanks a million
Monday, April 14, 2014 at 4:59am

Chemistry, CO2 aq+H2O->H2CO3!
How many grams of CO2 are needed to neutralize a 5 liters water with a pH of 11 to 7? under the following conditions: P: 4000 psi, T:230 oF Note: CO2 is a one of oil reservoir fluid components with mole percent 0f 3.6%. thanks a million
Monday, April 14, 2014 at 1:59am

chemistry
I am unsure about balancing equation I would like for someone to let me know if I am working this out correctly? I have to write a balanced equation for the reaction when solid magnesium is added to a solution of lead(ii)nitrate, solid lead forms and the magnesium disappears ...
Monday, April 14, 2014 at 1:45am

Chemistry, CO2 aq+H2O->H2CO3!
How many grams of CO2 are needed to neutralize a 5 liters water with a pH of 11 to 7? under the following conditions: P: 4000 psi, T:230 oF Note: CO2 is a one of oil reservoir fluid components with mole percent 0f 3.6%. thanks a million
Monday, April 14, 2014 at 1:41am

chemistry
I have to write a balanced equation for the reaction of a solid lead being added to a solution of silver nitrate. Solid silver forms and the lead disappears as it goes into the solution as lead (ii) nitrate. I think it should be Pb + AgNO3 >>>> Ag + Pb(NO3)2 does ...
Monday, April 14, 2014 at 1:35am

chemistry
I have to write a balanced equation for the decompostion of solid copper (ii) sulfate to form the gaseous sulfur trioxide and solid coper (ii) oxide. I would appreciate it if you could tell me if I have written it correctly. CuSO4 >>> SO3 + CuO If I did not write this...
Monday, April 14, 2014 at 1:23am

Chemistry, CO2 aq+H2O->H2CO3!
How many grams of CO2 are needed to neutralize a 5 liters water with a pH of 11 to 7? under the following conditions: P: 4000 psi, T:230 oF Note: CO2 is a one of oil reservoir fluid components with mole percent 0f 3.6%. thanks a million
Monday, April 14, 2014 at 12:02am

chemistry
What is the density (in grams per liter) of a gas at STP if 4.16 L of the gas in a bulb at 43.7 °C, and 737.9 mm Hg weighs 0.262 g?
Sunday, April 13, 2014 at 11:42pm

Chemistry
A 3.4g sample of h2o2 solution containing x% H2O2 by mass requires x ml of a KMnO4 solution for complete oxidation under acidic condition. The molarity of KMnO4 solution is: a)1 b)0.5 c)0.4 d)0.2
Sunday, April 13, 2014 at 11:33pm

Chemistry
If 15.0 mL of a 1.5M HCl solution at 22.5 degrees C is mixed with 25.0mL of a 1.5M NaOH solution at 21.5 degrees C that is in a calorimeter, and the final mixed solution temperature ends up at 28.5 degrees C, 1.)what is the balanced equation for this reaction? 2.) what is the ...
Sunday, April 13, 2014 at 10:52pm

chemistry
If 15.0 mL of a 1.5M HCl solution at 22.5 degrees C is mixed with 25.0mL of a 1.5M NaOH solution at 21.5 degrees C that is in a calorimeter, and the final mixed solution temperature ends up at 28.5 degrees C, 1.)what is the balanced equation for this reaction? 2.) what is the ...
Sunday, April 13, 2014 at 10:29pm

Chemistry
Zn(s)+2HCl(aq) ->ZnCl2(aq)+Hx(g) How many millilters of 2.50M HCl(aq) are required to react with 3.95 of Zn(s)?
Sunday, April 13, 2014 at 9:10pm

Chemistry
Can alcohol dissolve any of these? PCl5 NaNO3 NH3 KOH KCl
Sunday, April 13, 2014 at 8:52pm

Chemistry - Science (Dr. Bob222)
At 25 degree C, a student adds 0.400 g of solid phosphoric acid to a beaker containing 500.0ml of water. After the solid is completely dissolved the student adds 20.0ml of a 0.995M sodium hydroxide. What is the pOH of the solution in the beaker?
Sunday, April 13, 2014 at 8:04pm

Chemistry
Given that the structures of cocaine (on the right side of the equation) and its free base ( on the left side) with an H+ : a. Would you expect K for the cocaine to be greater or less than 1.0? Explain. b. Would K for the free base be higher or lower than for cocaine? Explain...
Sunday, April 13, 2014 at 7:37pm

Chemistry
I had conducted an experiment to figure out the percent by mass of baking soda in a mixture by titration. I had to standardize 1.0M HCl. Through the standardization process and the titration curve of the primary standard and the HCl, the molarity has to be found, but is this ...
Sunday, April 13, 2014 at 7:27pm

Chemistry
Calculate the molarity of 17.g of NaCl in 881 ml of solution
Sunday, April 13, 2014 at 6:26pm

CHEMISTRY
Biosynthesis of proteins from amino acids is an energy driven condensation process (ÄH = + 10 kJ/mol) requiring energy input in the form of ATP. In an experiment, 0.4 mol of amino acids reacted to give a polypeptide and some ATP was consumed. a) explain how biosynthesis ...
Sunday, April 13, 2014 at 4:42pm

CHEMISTRY
Given that the structures of cocaine (on the right side of the equation) and its free base ( on the left side) with an H+ : a. Would you expect K for the cocaine to be greater or less than 1.0? Explain. b. Would K for the free base be higher or lower than for cocaine? Explain...
Sunday, April 13, 2014 at 4:16pm

Chemistry
What mass of octane must be burned in order to liberate 5410 kJ of heat?
Sunday, April 13, 2014 at 2:56pm

Chemistry
The volume of 3.96g of a gas sample at standard conditions it was found to be 1.15L.Calculate its molecular mass.
Sunday, April 13, 2014 at 1:05pm

Chemistry Equilibrium
For the reaction NO2(g) + NO(g) N2O(g) + O2(g) Kc = 0.914. Equal amounts of NO and NO2 are to be placed into a 5.00 L container until the N2O concentration at equilibrium is 0.0446 M. How many moles each of NO and NO2 must be placed into the container?
Sunday, April 13, 2014 at 12:04pm

Chemistry Equilibrium
At 200 °C, Kc = 1.4 x 10-10 for the reaction N2O(g) + NO2(g) 3NO(g) If 0.174 mol of N2O and 0.337 mol NO2 are placed in a 4.00 L container, what would the NO concentration be if this equilibrium were established?
Sunday, April 13, 2014 at 12:04pm

chemistry
A 200.0mL solution with 3.1 x 10^-3 mol of MA will begin to precipitate at 19.4 C. Calculate each of the following at this temperature. a) Ksp b)change in G
Sunday, April 13, 2014 at 11:29am

chemistry
Biosynthesis of proteins from amino acids is an energy driven condensation process (ÄH = + 10 kJ/mol) requiring energy input in the form of ATP. In an experiment, 0.4 mol of amino acids reacted to give a polypeptide and some ATP was consumed. a) explain how biosynthesis ...
Sunday, April 13, 2014 at 9:06am

Chemistry
Hello everyone I need your help at once. How many grams of CO2 are needed to neutralize a 5 L tank of water with a pH of 11.5? my answer is around 220 grams of CO2. is that true or not?
Sunday, April 13, 2014 at 1:07am

Chemistry
If the titration of a 25.0 mL sample of calcium hydroxide requires 34.45 mL of 0.100 M perchloric acid, what is the molarity of the base? 2 HClO4(aq) + Ca(OH)2(aq) → Ca(ClO4)2(aq) + 2 H2O(l)
Saturday, April 12, 2014 at 10:17pm

Chemistry
If 0.50L of gaseous CH4 is burned at STP, what volume of O2 is required for complete combustion? Methane burns in oxygen to produce CO2 and H2O CH4(g) + 2O2(g) --> 2H2O(l) + CO2(g) And what volume of CO2 is produced?
Saturday, April 12, 2014 at 9:31pm

Chemistry
Calculate pH of an acetate buffer containing 27.5 mM acetic acid (pKa is 4.74) and 50 mM sodium acetate. When a 30 mM aq solution of sodium acetate was prepared in the lab it had a pH of 8.8. Calculate the amount of acetic acid (in g) to be added to 0.5 L of this sodium ...
Saturday, April 12, 2014 at 7:31pm

chemistry
The breakdown of p-nitrophenylphosphate at pH 2.6 is a first order hydrolysis process.. a) 12.5mmol of NPP were dissolved in 200mL of water at 77degrees celcius after 50mins the amount of NPP dropped to 10mmol. Calculate the average rate of this reaction and the rate constant ...
Saturday, April 12, 2014 at 5:33pm

CHEMISTRY
WHAT IS THE EMPIRICAL FORMULA FOR A COMPOUND THAT HAS 200GRAMS. 97.30 GRAMS OF CARBON, 16.22 GRAMS OF HYDROGEN, AND THE REST IS OXYGEN?
Saturday, April 12, 2014 at 5:09pm

Chemistry
If a particular reaction evolves 192 kJ of heat while expanding from 1.00 L to 2.00 L at 125 atm of pressure, what is the overall energy change for the system?
Saturday, April 12, 2014 at 3:41pm

chemistry
If a particular reaction absorbs 252 kJ of heat while doing 105 kJ of work at constant pressure. What are the ΔE and ΔH for values for the reaction? Is the reaction endothermic or exothermic?
Saturday, April 12, 2014 at 3:40pm

chemistry
1. Calculate pH of an acetate buffer containing 27.5 mM acetic acid (pKa is 4.74) and 50 mM sodium acetate. When a 30 mM aq solution of sodium acetate was prepared in the lab it had a pH of 8.8. Calculate the amount of acetic acid (in g) to be added to 0.5 L of this sodium ...
Saturday, April 12, 2014 at 1:07pm

Chemistry
Calculate the standard cell potential for each of the electrochemical cells? What would the answers be to something like this? If someone could work out the answer I would really appreciate it. My online hw keeps telling me its wrong. 2Ag+(aq)+Pb(s)→2Ag(s)+Pb2+(aq) E&#...
Saturday, April 12, 2014 at 12:49pm

Chemistry
Calculate the standard cell potential for each of the electrochemical cells? What would the answers be to something like this? If someone could work out the answer I would really appreciate it. My online hw keeps telling me its wrong. 2Ag+(aq)+Pb(s)→2Ag(s)+Pb2+(aq) E&#...
Saturday, April 12, 2014 at 12:49pm

Chemistry
Calculate ΔG∘rxn and E∘cell for a redox reaction with n = 1 that has an equilibrium constant of K = 28? What would the answer be to this? Could someone work this out for me please? ΔG∘rxn = ......kj E∘cell = ......V
Saturday, April 12, 2014 at 12:47pm

chemistry
A 1.0 L solution has 10.00 grams of CaCl2 dissolved in it. What is the Molar solubility of AgCl in this same solution? The Ksp for AgCl is 1.6 x 10-10 at this temperature. Hint: watch out for the common ion again.
Saturday, April 12, 2014 at 11:18am

chemistry
It is possible to manipulate the solubility of some compounds through pH adjustments. What is the appropriate pH that will yield a Molar solubility for Mg(OH)2 of 2.51 x 10-8? The Ksp for Mg(OH)2 is 1.2 x 10-11. (Hint: you may assume the concentration of hydroxide is constant ...
Saturday, April 12, 2014 at 11:00am

water chemistry
35.0 mL sample of 0.150 M acetic acid (HC2H3O2) (Ka = 1.8 x 10-5) is titrated with 0.150 M NaOH solution. Calculate the pH after 17.5 mL volumes of base have been added
Saturday, April 12, 2014 at 9:46am

Chemistry
To treat a burn on your hand, you decide to place an ice cube on the burned skin. The mass of the ice cube is 10.9 g, and its initial temperature is -12.0 °C. The water resulting from the melted ice reaches the temperature of your skin, 29.6 °C. How much heat is ...
Saturday, April 12, 2014 at 12:12am

chemistry
If a 1.60 M sample of A is heated to 500 K, what is the concentration of B at equilibrium? A(aq)<---> 2B(aq) Kc=9.63x10^-6
Friday, April 11, 2014 at 9:24pm

chemistry
You need to determine the concentration of a sulfuric acid solution by titration with a standard sodium hydroxide solution. You have a 0.1896 M standard solution. You take a 25.00 mL sample of the original acid solution and dilute it to 250.0 mL. You then take a 10.00 mL ...
Friday, April 11, 2014 at 8:47pm

Chemistry
Calculate ΔG∘rxn and E∘cell for a redox reaction with n = 1 that has an equilibrium constant of K = 28? What would be the answer to this fine question. How would you do something like this? Thanks :) ΔG∘rxn = ......kj E∘cell = ......V
Friday, April 11, 2014 at 8:23pm

chemistry
Calculate the standard cell potential for each of the electrochemical cells? 2Ag+(aq)+Pb(s)→2Ag(s)+Pb2+(aq) E∘cell......V? 2ClO2(g)+2I−(aq)→2ClO−​2(aq)+I2(s) E∘cell......V? O2(g)+4H+(aq)+2Zn(s)→2H2O(l)+2Zn2+​(aq) E∘...
Friday, April 11, 2014 at 8:21pm

chemistry help~Please!!!
What are the Ka and/or Kb value for 1M ZnCl2 Show work please!!!
Friday, April 11, 2014 at 7:41pm

chemistry
2NH4NO3 --> 2N2 + O2 + 4H2O What mass of H2O can be formed from the decomposition of 12.0 g of NH4NO3?
Friday, April 11, 2014 at 12:11pm

chemistry
2NH4NO3 --> 2N2 + O2 + 4H2O What mass of H2O can be formed from the decomposition of 12.0 g of NH4NO3?
Friday, April 11, 2014 at 11:44am

chemistry
Given that 4 NH3 + 5 O2 4 NO + 6 H2O, if 3.00 mol NH3 were made to react with excess of oxygen gas, the amount of H2O formed would be?
Friday, April 11, 2014 at 9:33am

Chemistry
1. 3 Sn2+ (aq) + 2 Al(s) --> 2 Al3+ (aq) + 3 Sn(s). What is the voltage for this cell? 2. What is the voltage for the cell in question 1 if the Sn2+ (aq) is [.15] and Al3+ (aq) is [1.80]? 3. Using proper line notation, describe the cell described in question 1.
Friday, April 11, 2014 at 12:11am

Chemistry
Sodium sulfate is slowly added to a solution containing 0.0500 M Ca2 (aq) and 0.0290 M Ag (aq). What will be the concentration of Ca2 (aq) when Ag2SO4(s) begins to precipitate?
Friday, April 11, 2014 at 12:04am

Chemistry
Elemental calcium is produced by the electrolysis of molten CaCl2. a) What mass of calcium can be produced by this process if a current of 7.5 * 10^3 A is applied for 48h? Assume that the electrolytic cell is 68% efficient. b) What is he minimum voltage needed to cause the ...
Thursday, April 10, 2014 at 11:44pm

chemistry
Sodium sulfate is slowly added to a solution containing 0.0500 M Ca2 (aq) and 0.0210 M Ag (aq). What will be the concentration of Ca2 (aq) when Ag2SO4(s) begins to precipitate? Ksp=1.20×10^–5 silver sulfate ksp=4.93x 10 ^-5 calcium sulfate
Thursday, April 10, 2014 at 11:21pm

CHEMISTRY
At 450oC the value of equilibrium constant for the following system is 6.59 x 10-3. If [NH3] = 1.23 x 10-4 and [H2] = 2.75 x 10-3 at equilibrium, determine the concentration of N2 at that point. N2(g) + 3H2(g)  2NH3(g)
Thursday, April 10, 2014 at 11:20pm

Chemistry
What concentration of Ag is in equilibrium with 1.4 × 10^-6 M Co(CN)63– and Ag3Co(CN)6(s)? The solubility constant of Ag3Co(CN)6 is 3.9 x 10^-26
Thursday, April 10, 2014 at 11:14pm

Chemistry
During the discharge of an alkaline battery, 4.50 g of Zn is consumed at the anode of the battery. a) What mass of MnO2 is reduced at the cathode during this discharge? b) How many Coulombs of electrical charge are transferred from Zn to MnO2?
Thursday, April 10, 2014 at 11:08pm

CHEMISTRY
The value of the equilibrium constant for the reaction below is 40.0 at a specified temperature. What would be the value of that constant for the reverse reaction under the same conditions? H2(g) + I2(g)  HI(g)
Thursday, April 10, 2014 at 11:08pm

CHEMISTRY
The value of the equilibrium constant for the reaction below is 40.0 at a specified temperature. What would be the value of that constant for the reverse reaction under the same conditions?
Thursday, April 10, 2014 at 10:48pm

Chemistry
The Ksp of iron(II) hydroxide, Fe(OH)2, is 4.87 × 10-17. Calculate the solubility of this compound in g/L.
Thursday, April 10, 2014 at 10:15pm

chemistry
Nitrogen and oxygen react to form nitric oxide (NO). All substances are in the gas phase. If 0.352 atm of nitrogen and 0.511 atm of oxygen react, what is the partial pressure of nitric oxide (in mmHg) when this reaction goes 73.9 complete. The temperature and volume are constant.
Thursday, April 10, 2014 at 9:50pm

Chemistry
A student was given a solid containing a mixture of nitrate salts. The sample completely dissolved in water, and upon addition of dilute HCl, no precipitate formed. The pH was lowered to about 1 and H2S was bubbled through the solution. No precipitate formed. The pH was ...
Thursday, April 10, 2014 at 9:49pm

Chemistry
2) What is the empirical formula of a compound containing C, H, O if combustion of 1.23g of the compound yields 1.8g CO2 and .74g of H2O 3) What are the empirical and molecular formulas of a hydrocarbon if combustion of 2.10g of the compound yields 6.59g CO2 and 2.7g H20 and ...
Thursday, April 10, 2014 at 9:48pm

Chemistry, Science
Write the balanced chemical equation for each of these reactions. Include phases. When aqueous sodium hydroxide is added to a solution containing lead(II) nitrate, a solid precipitate forms. However, when additional aqueous hydroxide is added the precipitate redissolves ...
Thursday, April 10, 2014 at 9:33pm

Chemistry
Determine the mass of the products formed by the combustion of a 7.6g of a coumpound with emprical formula C7H12
Thursday, April 10, 2014 at 9:31pm

chemistry
A 4.70 g sample of a certain gas occupies 530. mL at STP. What mass of the same gas is present in a 1.15 L container at 40.5°C and 785 mm Hg?
Thursday, April 10, 2014 at 8:29pm

chemistry
You have been asked to do a dilution of a copper sulfate solution. The solution to be diluted is 2.88 M copper sulfate. What volume of the 2.88 M copper sulfate is required to make 250 mL of 1.03 M copper sulfate solution?
Thursday, April 10, 2014 at 7:42pm

chemistry
What is the difference between the speed of a moving object and its velocity?
Thursday, April 10, 2014 at 6:38pm

chemistry help~~~~ Please!!!
how should the ph of a 0.1 m solution of nac2h3o2 compared with that of a 0.1 m solution of kc2h3o2?
Thursday, April 10, 2014 at 6:16pm

CHEMISTRY HELP !!!! Check
using Kb, for NH3 (from Appendix E), calculate Ka for the NH4+ ion. Kb for NH3 is 1.81 x 10^-5 Ka for NH4+ is Kw / Kb = 10^-14 / 1.81 x 10^-5 = 5.52 x 10^-10
Thursday, April 10, 2014 at 5:58pm

chemistry
What would be the final concentration of [K+] if we mix 0.234 L of a solution with a concentration of 1.2M K2CO3 with 312.5 mL of a solution with a concentration of 0.32 M K3PO4
Thursday, April 10, 2014 at 5:56pm

Chemistry
Will someone show me the formula or help me through working this question? Thanks! A 2.85g lead weight, initially at 10.3 deg C, is submerged in 7.55g of water at 52.3 deg C in an insulated container. what is the final temperature of both substances at thermal equilibrium?
Thursday, April 10, 2014 at 5:45pm

CHEMISTRY HELP !!!!
NH4CL , ZNCL2 , KAL(SO4)2 FIND THE FOLLOWING NET IONIC EQUATION FOR HYDROLYSIS EXPRESSION FOR EQUILIBRIUM CONSTANT (KA OR KB) VALUE THANK YOU SO MUCH!!!
Thursday, April 10, 2014 at 5:32pm

Chemistry
The overall hydrogen burning reaction in stars can be represented as the conversion of four protons to one alpha particle. Use the data for the mass of H-1 and He-4 to calculate the energy released by this process.
Thursday, April 10, 2014 at 3:18pm

Chemistry
The half-life of Th-232 is 1.4E10. Find the number of disintegrations per hour emitted by 1 mol of Th-232.
Thursday, April 10, 2014 at 3:16pm

Chemistry
A buffer solution is prepared by mixing 50.0 mL of 0.300 M NH3 with 50 mL of 0.300 NH4Cl. The pKb of NH3 is 4.74. NH3 + H2O-> NH4+ +OH- 7.50 mL of 0.125 M HCl is added to the 100 mL of the buffer solution. Calculate the concentration of NH3 and NH4Cl for the buffer solution...
Thursday, April 10, 2014 at 2:28pm

Chemistry
Minimum elevation in boiling point is given by a solution of 1. 0.1M Urea 2. 0.1 NaCL 3. 0.1 Mgcl2 4. 0.1M AL2(So4)3
Thursday, April 10, 2014 at 2:18pm

Chemistry
Write ionic equation for the following: A. Na3PO4 + 3 AgNO3 --> 3 NaNO3 + Ag3PO4 B. (NH4)2SO4 + Ba(C2H3O2 + BaSO4
Thursday, April 10, 2014 at 1:45pm

Chemistry Equilibrium
At 500 ºC, the decomposition of water into hydrogen and oxygen, 2H2O(g) 2H2(g) + O2(g) has Kc = 6.0 × 10-28. What are the concentrations of H2 and O2 that are present at equilibrium in a 2.00 L reaction vessel at this temperature if the container originally held 0....
Thursday, April 10, 2014 at 1:27pm

chemistry
Assuming that 1g of aspirin dissolves in450ml 0f water at 10 degrees Celsius. How much aspirin would be lost in the 5ml of water added to the reaction mixture if the mixture were at 10 degree Celsius during the filtration?
Thursday, April 10, 2014 at 1:14pm

Chemistry
The half-life of 232Th is 1.4 * 10^10. Find the number of disintegrations per hour emitted by 1 mil of 232Th in 1 min.
Thursday, April 10, 2014 at 1:05pm

chemistry
Calculate the volume of solution needed to obtain 0.320 mol of KCl from a solution with a concentration of 0.64 mol dm-3
Thursday, April 10, 2014 at 12:03pm

Chemistry
What change in temperature is neeeded when 40.0g of water absorbs 2500 calories of heat?
Thursday, April 10, 2014 at 10:07am

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