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November 28, 2014

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

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Chemistry
I need help calculating Heat of fusion for a calorimeter experiment: I know that Q(melt): 8350.46 J, m(ice): 26.39g and m(hot water): 51.93g. Please help me set it up. Hf known is 6.02kj/mol. Answer is in J/g(ice).
Wednesday, November 19, 2014 at 12:18pm

chemistry
mass of dry crucible=34.69g mass of crucible with magnesium=34.68g mass of crucible with magnesium oxide =34.97g we did a lab and igot the mass for magnesium to be 0.17g and the mass for magnesium oxide to be 0.28g. how can i find the moles of magnesium and the number of ...
Wednesday, November 19, 2014 at 11:55am

chemistry
In the sun, nuclear fusion takes place. If the decrease in mass isa 0.006 50g, how much energy is released?
Wednesday, November 19, 2014 at 11:20am

chemistry
In a constant-pressure calorimeter, 55.0 mL of 0.310 M Ba(OH)2 was added to 55.0 mL of 0.620 M HCl. The reaction caused the temperature of the solution to rise from 22.23 °C to 26.45 °C. If the solution has the same density and specific heat as water, what is ΔH ...
Wednesday, November 19, 2014 at 11:09am

chemistry
the formula weight of h2so4 is 98. the weight of the acid in 400ml of 0.1M so the solution is?
Wednesday, November 19, 2014 at 10:22am

chemistry
You measure Ksp for borax and find it to be 6.2 x 10-3 at 22.8°C. If the standard enthalpy change, ΔH°, for the dissolution of borax is 58 kJ, calculate the standard entropy change, ΔS°, (in J/K) for the dissolution of borax at this temperature. (Assume...
Wednesday, November 19, 2014 at 9:09am

chemistry
You measure Ksp for borax to be 7.8 x 10-3 and 2.9 x 10-3 at 23.6°C and 1.8°C, respectively. Calculate the standard enthalpy change, ΔH°, (in kJ) for the dissolution of borax.
Wednesday, November 19, 2014 at 9:07am

chemistry
THE FREEZING POINT OF BLOOD SERUM IS ABOUT 0.56 DEGREE CELSIUS WHAT IS ITS OSMOTIC PRESSURE
Wednesday, November 19, 2014 at 8:19am

Chemistry
The ion-product of pure water, Kw, is 2.51 * 10(-14) at the body temp of 37 degrees Celcius. What are the molar H2O and OH concentrations in the pure water temperature?
Wednesday, November 19, 2014 at 2:29am

Chemistry
What is the PH of an aqueous solution consisting of 0.070 M formic acid (HCOOH) and 0.070 M sodium formate (HCOONa)?
Wednesday, November 19, 2014 at 2:26am

Chemistry
Calculate enthalpy change when 35.0 grams barium oxide reacts with 5.00 grams of aluminum. 0.228 mol BaO ( limiting reagent) 0.1853 mol Al Molar Ratio 1.23 -1669.8 - 3(-558.1) = 3344.1 kJ/mol 0.228 BaO reacts therefore: (0.228/3) x 3344.1 = 254.2 kJ
Wednesday, November 19, 2014 at 12:53am

Chemistry
1) A quantity of 85 mL of .900 M HCl is mixed with 85 mL of .900 M KOH in a constant-pressure calorimeter that has a heat capacity of 325 J/C. If the initial temperatures of both solutions are the same at 18.24 degrees C, what is the final temperature of the mixed solution? 2...
Tuesday, November 18, 2014 at 11:26pm

chemistry
if 10.5 moles of CH4 react with oxygen, what is the volume of CO2 (in liters) produced at 20.9 degrees celsius and 0.951 atm?
Tuesday, November 18, 2014 at 11:11pm

Chemistry
1) A 0.1375-g sample of solid magnesium is burned in a constant-volume bomb calorimeter that has a heat capacity of 3024 J/C. The temperature increases by 1.126 degrees C. Calculate the heat given off by the burning Mg, in kJ/g and kJ/mol. 2) Determine the amount of heat in kJ...
Tuesday, November 18, 2014 at 11:07pm

Chemistry
1) Determine the amount of heat in kJ given off when 1.26 x 10^4 g of NO2 are produced according to the equation: 2NO (g) + O2 (g) --> 2NO2 (g) and delta (H) = 483.6 kJ/mol 2) A sheet of gold weighing 10 g and at a temperature of 18 degrees C is placed on a flat sheet of ...
Tuesday, November 18, 2014 at 10:54pm

Chemistry
The Ksp values of BaSO4 and SrSO4 are 1.1x10^-10 and 3.8x10^-7 respectively. Calculate the concentrations of Ba2+, Sr2+, and SO4 2- in a solution that is saturated with BaSO4 and SrSO4.
Tuesday, November 18, 2014 at 10:07pm

chemistry
Find the pH of 1.0 x10-8 M KOH solution I tried to find it but i got 6 and thats acidic not basic.
Tuesday, November 18, 2014 at 9:49pm

chemistry
3. After removing membranes from an eggshell, the shell is dried and its mass is recorded as 5.613 g. The egg is transferred to a 250 mL beaker and dissolved in 25 mL of 6 M HCL. After filtering, the solution containing the dissolved eggshell is diluted to 250 mL in a ...
Tuesday, November 18, 2014 at 9:46pm

Chemistry Lab
In chemistry we are doing a lab that involves crucibles and Mg ribbon, we have three days to complete the lab. Anyways do you think it would be alright to substitute the mass of the crucible we had the first day with the mass of the crucible we had today? We know how much the ...
Tuesday, November 18, 2014 at 9:42pm

chemistry
Experimentally the ionization energy of hydrogen is 1312.2 kJ / mol. What would be the wavelength (nm) of a photon with enough energy to ionize one atom of hydrogen? They give the equation E=hcR but those are all known constant values and none include mols so I'm very ...
Tuesday, November 18, 2014 at 9:22pm

chemistry
How do you find the total number of σ and π bonds in a molecule? Is there an equation?
Tuesday, November 18, 2014 at 9:13pm

Chemistry
If 2.00 mL of 0.600 M NaOH are added to 1.000 L of 0.850 M CaCl2, what is the value of the reaction quotient and will precipitation occur? I've been trying this problem over and over and haven't been able to get it. I know precipitation will not occur from my previous ...
Tuesday, November 18, 2014 at 8:56pm

Chemistry
If 2.00 mL of 0.600 M NaOH are added to 1.000 L of 0.850 M CaCl2, what is the value of the reaction quotient and will precipitation occur? I've been trying this problem over and over and haven't been able to get it. I know precipitation will not occur from my previous ...
Tuesday, November 18, 2014 at 8:24pm

chemistry
When given qcal (2064 J), how do you calculate delta H (which equation is used)? ex. CaO+ H2O-> Ca(OH)2, what is delta H?
Tuesday, November 18, 2014 at 7:25pm

chemistry
When 1.375g CaO is added to 50 mL water at 25.0 degree C, the temperature of the water increases to 34.6 degree C. Given the specific heat is 4.184 j/g*degree C, how much heat is absorbed by the calorimeter?
Tuesday, November 18, 2014 at 6:38pm

Chemistry
The unit cell of KCl is 6.31 Å on an edge. Find the density of KCl if there is 4 atoms of each element.
Tuesday, November 18, 2014 at 6:32pm

Chemistry 11
So I did a lab determining the chemical formula of a hydrate. We had to find the molecular formula of a hydrate of copper (2) sulphate, CuSO4 .xH2O. My observation table looks like this: Mass of clean, dry test tube: 21.6g Mass of test tube + hydrated copper (2) sulphate: 24.1...
Tuesday, November 18, 2014 at 6:27pm

chemistry
1. The combustion of acetylene is: 2 C2H2 + 5 O2  4 CO2 + 2 H2O ΔHo = -2511 kJ 11a. (5 pts) How much heat is produced if 85 g C2H2 is combusted with excess O2?
Tuesday, November 18, 2014 at 6:10pm

Chemistry
A 10.00 ml sample of vinegar, density 1.01g/ml, was diluted to 100.0ml volume. It was found that 25.0 ml of the diluted vinegar required 24.15ml of 0.0976 M NaOH to neutralize it. Calculate the strength of CH3COOH in terms of: a) molarity b) grams CH3COOH per litre c) % ...
Tuesday, November 18, 2014 at 5:58pm

chemistry
methane(g) +water= carbon monoxide(g)+Hydrogen (g) use the bond energies in the following table to predict the delta H foe the reaction
Tuesday, November 18, 2014 at 4:00pm

Chemistry
--> Consider the following hypothetical acid-base reaction. A(aq) + B(aq) + C(aq) + D(aq) WA WB SA SB A. The position of the equilibrium shifts from left to right B. The position of the equilibrium shifts from right to left C. The position of the equilibrium doesn’t ...
Tuesday, November 18, 2014 at 3:25pm

Chemistry, HELP!
1) If a soil had a pH of 5.5, how many milli-equivalents of acids would it have per 100 grams? 2) How many milli-equivalents of Ca need to be added to increase the pH of the soil to 6.8?
Tuesday, November 18, 2014 at 3:24pm

chemistry
why might consuming more of daily rni of a vitamin or mineral be harmful
Tuesday, November 18, 2014 at 12:05pm

Chemistry
A sample of oxygen at room temperature occupies a volume of 5.00x102 mL at 1.50 atm pressure. What pressure (in atm) must be applied to compress the gas to a volume of only 1.50x102 mL? Assume the temperature is constant.
Tuesday, November 18, 2014 at 11:06am

Chemistry
When 0.100 mol CaCO3(s) and 0.100 mol CaO(s) are placed in an evacuated sealed 10.0 L container and heated to 385 K, P(CO2) = 0.220 atm after equilibrium is established. CaCO3(s) <~> CaO(s) + CO2(g) 0.05 atm CO2(g) is then removed from the container. What is the total ...
Tuesday, November 18, 2014 at 9:56am

Chemistry
Are there any substances that are soapy and/or bitter in nature but are not bases/alkali?
Tuesday, November 18, 2014 at 4:03am

Chemistry
1. What happens if our calorimeter is not properly insulated..what effect will it have on our calculated specific heat capacity I.e too large, too small or no effect....explain. 2. If our partner forgot to cover the coffee cup calorimeter while the temperature was being ...
Tuesday, November 18, 2014 at 1:57am

Verifying-Chemistry related-Dr.Bob222
Hey Dr.Bob222, Pearlite is not ceramic material correct? Just need a second opinion. Thanks!
Tuesday, November 18, 2014 at 1:51am

chemistry
A 18.3 g piece of aluminum (which has a molar heat capacity of 24.03 J/oC mol) is heated to 82.4oC and dropped into a calorimeter containing water (specific heat capacity of water is 4.18 J/goC) initially at 22.3oC. The final temperature of the water is 24.9oC. Calculate the ...
Tuesday, November 18, 2014 at 1:24am

chemistry
What would the specific heat of graphite be? A 15.0g piece of graphite is heated to 100.0 degrees C and placed in calorimeter. The graphite releases 815.1 J of heat to reach a final temperature of 23.9 degrees C.
Tuesday, November 18, 2014 at 12:13am

chemistry
how are moles and molarity related to volume? is it molx molarity or mol/molarity to get volume?
Tuesday, November 18, 2014 at 12:03am

chemistry
The mass of solute per 100 mL of solution is abbreviated as (m/v). Mass is not technically the same thing as weight, but the abbreviation (w/v) is also common. How many grams of sucrose are needed to make 655 mL of a 36.0% (w/v) sucrose solution?
Monday, November 17, 2014 at 11:22pm

chemistry
What mass of precipitate will form if 1.50 L of concentrated Pb(ClO3)2 is mixed with 0.150 L of 0.190 M NaI? Assume the reaction goes to completion.
Monday, November 17, 2014 at 10:52pm

Chemistry
At a given temperature, a first-order reaction has a rate constant of 3.5 ´ 10–3 s–1. How long will it take for the reaction to be 24% complete? A chemical reaction that is first-order in X is observed to have a rate constant of 2.20 ´ 10–2 s–1...
Monday, November 17, 2014 at 9:43pm

Chemistry- URGENT please HELP
NH4NO3(s)+H2O(l)→NH4NO3(aq) ΔH = +25.7 kJ. What is the final temperature in a squeezed cold pack that contains 49.0g of NH4NO3 dissolved in 125 mL of water? Assume a specific heat of 4.18J/(g⋅∘C) for the solution, an initial temperature of 28.5∘C, ...
Monday, November 17, 2014 at 9:12pm

chemistry
how many liters of gaseous hydrogen bromide at 97 degrees c and 0.953 atm will a chemist need if she wishes to prepare 3.50 L of 1.20 M hydrobromic acid?
Monday, November 17, 2014 at 8:02pm

Chemistry
In an aqueous solution the [OH–] is 2.0 x 10–6 M. What is the [H3O+]? Question 17 options: 1.0 x 10–7 M 2.0 x 10–6 M 1.0 x 10–8 M 5.0 x 10–9M
Monday, November 17, 2014 at 7:40pm

Chemistry
Consider the following hypothetical acid-base reaction. A(aq) + B(aq) C(aq) + D(aq) WA WB SA SB Question 13 options: The position of the equilibrium shifts from left to right The position of the equilibrium shifts from right to left The position of the equilibrium doesn’t...
Monday, November 17, 2014 at 7:18pm

Chemistry
Assume you are performing the calibration step of Experiment 8 and you begin with 20 g of water at 20 oC and 20 g of water at 80 oC. After adding the two portions of water into your calorimeter setup and following the procedure outlined in the experiment, you determine the ...
Monday, November 17, 2014 at 6:15pm

Chemistry Physics
How many Btu of heat are required to melt 33.0 lb of ice at 32°F and to raise the temperature of the melted ice to 72°F?
Monday, November 17, 2014 at 5:36pm

chemistry
What is avogadro's law
Monday, November 17, 2014 at 4:37pm

chemistry
2.) An ideal gas in a 6.30L container at 3.50 atm and at 273K is heated to 435.0K. What is the new pressure?
Monday, November 17, 2014 at 3:50pm

chemistry
3.) Co2(g) is collected over water at 20 degrees Celsius. The pressure in the bottle is equalized with the atmospheric pressure, which is measured to be 715.8mmHg. What is the pressure of the Co2(g)?
Monday, November 17, 2014 at 3:50pm

chemistry
1.) 105.4mL of Co2(g) was generated with a pressure of 765.5mm Hg for the gas. The temperature of the apparatus was 25.0C. How much zinc oxide would be left in tube if version A was the correct formula?
Monday, November 17, 2014 at 3:49pm

chemistry
1.) 1.25 moles of an ideal gas are contained in 8.0L. If the temperature is 33K, what is the volume at STP?
Monday, November 17, 2014 at 3:48pm

chemistry
One step in the isolation of pure rhodium metal (Rh) is the precipitation of rhodium (III) hydroxide from a solution containing rhodium(III) sulfate according to the following balanced chemical equation: Rh2(SO4)3(aq)+6NaOH(aq)-->2Rh(OH)3(s)​+3Na2SO4(aq) What is the ...
Monday, November 17, 2014 at 3:45pm

chemistry
What volume of ammonia gas, measured at mmHg and 43.5 degrees C, is required to produce 8.41g of ammonium sulfate according to the following balanced chemical equation: 2NH3(g)+H2SO4(aq)->(NH4)2SO4(s)
Monday, November 17, 2014 at 3:41pm

chemistry
In a volumetric analysis experiment, a solution of sodium oxalate (Na2C2O4) n acidic solution is titrated with a solution of potassium permanganate (KMnO4) according to the following balanced chemical equation: 2KMnO4(aq)+8H2SO4(aq)+5Na2C2O4(aq)-> 2MnSO4(aq)+8H2O(l)+CO(g)=...
Monday, November 17, 2014 at 3:35pm

chemistry
A 5d electron emits a photon, what are the possible quantum n,l, quantum numbers of the final s tate electron? What would the quantum num bers be a fter a photon with the smallest allowed (non-zero) energy is emitted?
Monday, November 17, 2014 at 1:22pm

analytical chemistry
Adding 10.0 mL of 0.500 M HCl to 100.0 mL of pH = 7 water produces a solution with a pH of 1.34. What is the pH of the resulting solution when 10.0 mL of 0.500 M HCl is added to 100.0 mL of the buffer solution in the introductory example? That buffer contained 0.100 moles of ...
Monday, November 17, 2014 at 12:57pm

AP Chemistry
Which of the following statements is true regarding two points within a system? A. They will have different types of particles. B. They cannot interact with each other. C. They have different boundaries. D. They have the same internal energy. Im think the answer is d.
Monday, November 17, 2014 at 12:33pm

AP Chemistry
Two objects A and B of different size are both at a temperature of 500 K and are connected by a rod (A looks four times larger than b). What will be the nature of transmission of heat? I believe there won't be a transmission of heat. Any thoughts. Here are the options A. ...
Monday, November 17, 2014 at 12:27pm

Chemistry
Help needed with a calorimeter lab. I have to measure the enthalpy of a neutralization reaction between NaOH and HCl as well as find the concentration of NaOH the following ways. - using the mass and volume of NaOH - Using calorimetric data assuming no heat lost to calorimeter...
Monday, November 17, 2014 at 12:36am

Chemistry
if 5.00 ml of 1.66x10^-1 M HCl solution is diluted to exactly 250.0 ml with water, what is the concentration of the resulting solution?
Sunday, November 16, 2014 at 11:02pm

Chemistry Buffers
Write reactions showing how each of the following buffers would neutralize added HCl. HF and NaF Express your answer as a balanced chemical equation. Identify all of the phases in your answer. HC2H3O2 and KC2H3O2 Express your answer as a balanced chemical equation. Identify ...
Sunday, November 16, 2014 at 10:09pm

Chemistry
Please also, help me set up this problem. Acetylene, C2H2, can be converted to ethane, C2H6, by a process known as hydrogenation. The reaction is C2H2(g)+2H2(g)⇌C2H6(g). Given the following data at standard conditions (all pressures equal to 1 atm and the common ...
Sunday, November 16, 2014 at 9:51pm

Chemistry
Help me set up this problem. I have been looking at a few examples of similar problems and I keep getting the wrong answers. I'm getting really confused. Q: The standard free energy change ΔG∘ and the equilibrium constant K for a reaction can be related by the ...
Sunday, November 16, 2014 at 9:47pm

Chemistry
Please help me set up these problems. I have been staring at them for hours and I can't tell where I went wrong. Question: Consider the following reaction: CaCO3(s)→CaO(s)+CO2(g). Estimate ΔG∘ for this reaction at each of the following temperatures. (...
Sunday, November 16, 2014 at 9:43pm

Chemistry
Please help me with these problems, the book examples very different. I'm really confused. Any help with these will help me immensely. Thank you in advance! What I got were: 1.)c 2.)d 3.)a 4.)c 5.)b 1.) When is any endothermic reaction spontaneous? a.)When ΔSreaction...
Sunday, November 16, 2014 at 8:56pm

Chemistry
Which of the following is NOT true for ΔGrxn? A.) If ΔG°rxn > 0, the reaction is spontaneous in the forward direction. B.) If Q = 1, then ΔGrxn = ΔG°rxn.If ΔG°rxn = 0, the reaction is spontaneous in the reverse direction. C.) If ΔG&...
Sunday, November 16, 2014 at 8:55pm

Science, Chemistry
Write neutralization reactions for each of the following acids and bases. HNO3(aq) and Ba(OH)2(aq) Express your answer as a balanced chemical equation. Identify all of the phases in your answer.
Sunday, November 16, 2014 at 8:39pm

Chemistry
If a solution contains 0.65mol of OH−, how many moles of H+ would be required to reach the equivalence point in a titration?
Sunday, November 16, 2014 at 8:01pm

Chemistry
Which bond in urea is most polar? (P.S. I tried C-O and N-C-O, but it's incorrect)
Sunday, November 16, 2014 at 7:51pm

Chemistry
what does the Lewis Dot Structure of Sr(CN)2 look like?
Sunday, November 16, 2014 at 7:18pm

chemistry
Consider the reaction, 3 H2(g) + N2(g) => 2 NH3(g). How many grams of NH3 will be made by the reaction of 3 moles of H2(g) with 18 moles of N2(g
Sunday, November 16, 2014 at 6:47pm

chemistry
Consider the following reaction: 2 B5H9 + 12 O2 => 5 B2O3 + 9 H2O How many grams of B2O3 are made by the reaction of 233.8 g of O2
Sunday, November 16, 2014 at 6:47pm

chemistry
Consider the following reaction: 2 B5H9 + 12 O2 => 5 B2O3 + 9 H2O How many grams of O2 are needed to make 432.7 g of H2O?
Sunday, November 16, 2014 at 6:47pm

chemistry
2.15 g of a substance X contain 4.34 x 1022 molecules of X. Calculate the molar mass of X in g/mol.
Sunday, November 16, 2014 at 6:46pm

chemistry
Consider the equation: N2 + 3 H2 =>2 NH3. How many moles of NH3 will be made from 4.2 x 1023 molecules of N2? Give your answer to one decimal place.
Sunday, November 16, 2014 at 6:46pm

chemistry
Consider the equation: N2 + 3 H2 =>2 NH3. How many moles of NH3 will be made from 2.1 x 1024 molecules of N2?
Sunday, November 16, 2014 at 6:44pm

chemistry
Consider the reaction, 4 NH3 + 5 O2 => 4 NO + 6 H2O How many grams of NO will be made from 10.7 moles of O2?
Sunday, November 16, 2014 at 6:30pm

Chemistry
Assume you are performing the calibration step of Experiment 8 and you begin with 50 g of water at 20 oC and 50 g of water at 80 oC. After adding the two portions of water into your calorimeter setup and following the procedure outlined in the experiment, you determine the ...
Sunday, November 16, 2014 at 6:11pm

Chemistry
How many moles of CO2 will be made from 115.4 grams of C3H8?
Sunday, November 16, 2014 at 5:55pm

chemistry
100ml of h2s04 solution having molarity 1M and density 1.5g/ml is mixed with 400ml of water. Calculate final molarity of h2s04 solution if final density is 1.25g/ml 50ml of 20.8% bacl2 and 100ml of 9.8% h2s04 solutions are mixed. Molarity of cl ions in the resulting solution ...
Sunday, November 16, 2014 at 4:42pm

Chemistry
Estimate the percent ionic character of the BrF bond using this graph:
Sunday, November 16, 2014 at 4:34pm

Chemistry (Acid&Base)
How many mL of 0.203 M HCl(aq) are required to prepare a diluted solution that has a concentration of 0.0433 M in a 100-mL volumetric flask?
Sunday, November 16, 2014 at 4:10pm

chemistry Ben
50ml of 20.8% bacl2 and 100ml of 9.8% h2s04 solutions are mixed. molarity of cl ions in the resulting solutions is At.wt of ba = 137 100ml of h2s04 solution having molarity 1M and density 1.5g/ml is mixed with 400ml of water. Calculate final molarity of h2s04 solution if final...
Sunday, November 16, 2014 at 3:00pm

chemistry step by step for me
100ml of h2s04 solution having molarity 1M and density 1.5g/ml is mixed with 400ml of water. Calculate final molarity of h2s04 solution if final density is 1.25g/ml. 50ml of 20.8% bacl2 and 100ml of 938% h2s04 solutions are mixed. Molarity of cl ions in the resulting solutions...
Sunday, November 16, 2014 at 2:35pm

Chemistry
Consider the reaction 2 SO2(g) + O2(g) in equilibrium with 2 SO3(g) . At 25°C delta H° = -197.78 kJ and delta S° = -187.95 J/K. Using this information, calculate the equilibrium constant for the reaction at -32°C. (R = 8.314 J/K) Enter your answer using TWO ...
Sunday, November 16, 2014 at 2:11pm

Chemistry
Are there any chemical reactions or observations that involve sodium hydroxide or any other bases, but cannot be used to confirm its basic nature?
Sunday, November 16, 2014 at 6:25am

Chemistry
Write a balanced formula equation with phase indicators: Strong heating of copper(II) nitrate trihydrate produces copper (II) oxide, nitrogen dioxide, oxygen gas, and water (The part I'm confused about is how to write the molecular formula for copper (II) nitrate ...
Sunday, November 16, 2014 at 6:05am

Chemistry
8.5g of sample of iron required just 75cm3 of 3.00M HCl to dissolve it and give a neutral solution.Calculate the percentage purity of the sample of iron.
Sunday, November 16, 2014 at 5:50am

Chemistry
Suppose that 0.205 g of a mixture containing Na2SO4 and K2SO4 is dissolved in water. An excess of BaCl2 is added and a precipitate of 0.298 g of BaSO4 is produced. Calculate the percent by mass of Na2SO4 and K2SO4 in the original mixture.
Saturday, November 15, 2014 at 9:24pm

Chemistry
Suppose that 50.0 mL of a 0.250 M HCl solution is mixed with 50.0 mL of a 0.100 M Ba(OH)2 solution in a coffee-cup calorimeter. The temperature of the resulting solution increases by 1.76 oC . Calculate DH for the reaction between HCl (aq) and Ba(OH)2 (aq) in kJ per mole of Ba...
Saturday, November 15, 2014 at 9:23pm

Chemistry
Consider the following reaction AgNO3 (aq) + NaCl (aq) → AgCl (s) + NaNO3 (aq) DH = -66 kJ Suppose that 100.0 mL of 0.100M AgNO3 is added to 200.0 mL of 0.100 M NaCl in a coffee cup calorimeter. Assuming that the initial temperature of the solution is 25.000C calculate ...
Saturday, November 15, 2014 at 7:03pm

Chemistry
Suppose that 1.048 g of benzene is combusted in a bomb calorimeter which contains 945 g of water. The temperature of the water increases from 23.640 OC to 32.681 oC. The heat capacity of the empty calorimeter is 891 J/ OC . C6H6 (l) + 15/2 O2 (g) > 3 H2O (l) + 6 CO2 (g) (a...
Saturday, November 15, 2014 at 7:02pm

Chemistry
In order to calibrate a bomb calorimeter , 3000 g of water is added to the calorimeter. next, 1.08 x 10-2mol of ethanol (C2H6O) is combusted in the presence of excess oxygen according to the equation, C2H6O (l) + 3 O2 (g) > 3 H2O (l) + 2 CO2 (g) DE = - 1365 kJ/mol . ...
Saturday, November 15, 2014 at 7:02pm

Chemistry
The standard enthalpy of formation of H2O (l) is -285.8 kJ/mol. Calculate ∆E° for the following reaction. H2O (l) → H2 (g) + 1/2 O2 (g)
Saturday, November 15, 2014 at 7:00pm

Chemistry
The standard enthalpy of formation of H2O (l) is -285.8 kJ/mol. Calculate DEO for the following reaction. H2O (l) → H2 (g) + 1/2 O2 (g)
Saturday, November 15, 2014 at 6:58pm

Chemistry
Identify the intermolecular attractive force(s) that must be overcome to vaporize CH3Cl(l).
Saturday, November 15, 2014 at 4:23pm

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