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July 2, 2016

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

chemistry
In winemaking, the sugars in grapes undergo fermentationby yeast to yield CH3CH2OH and CO2. During cellularrespiration, sugar and enthanol are "burned" to water vapor andCO2. A) Using C6H12O6 for sugar, calculate ÄH of fermentation and of respiration(combustion...
Friday, October 23, 2015 by Mark

Chemistry
#7 Charcoal briquettes consist almost entirely of elemental carbon. When they burn in the open air, carbon monoxide and carbon dioxide are produced. Write balanced chemical equations illustrating the production of each combustion product.
Friday, October 23, 2015 by Royce

Chemistry
1) When aqueous solutions of cupric chloride and sodium phosphate are mixed, solid cupric phosphate separates from a solution of sodium chloride. 2) When heated in an aqueous solution of ammonium acetate, calcium oxide reacts to form calcium acetate, ammonia, and water Write ...
Friday, October 23, 2015 by Deanna

chemistry
Use the following information to find Hf of butanol [C4H9OH(l)]. C4H9OH(l) + 6 O2(g) 4 CO2(g) + 5 H2O(g) Hcomb = -2712.9 Hf of CO2(g) = -393.5 kJ/mol Hf of H2O(g) = -241.8 kJ/mo
Friday, October 23, 2015 by mara

chemistry
Calculate H0rxn for each of the following using data from Appendix B. (a) 2 H2S(g) + 3 O2(g) 2 SO2(g) + 2 H2O(g) b) CH4(g) + Cl2(g) CCl4(l) + HCl(g) [unbalanced]
Friday, October 23, 2015 by mara

chemistry
Calculate Hrxn for the reaction below. 2 NOCl(g) N2(g) + O2(g) + Cl2(g) You are given the following set of reactions. 1/2 N2(g) + 1/2 O2(g) NO(g) H = 90.30 kJ NO(g) + 1/2 Cl2(g) NOCl(g) H = -38.6 kJ
Friday, October 23, 2015 by mara

chemistry
Organic hydrogenation reactions, in which H2 and an "unsaturated" organic compound combine, are used in the food, fuel, and polymer industries. In the simplest case, ethene (C2H4) and H2 form ethane (C2H6). If 132 kJ is given off per mole of C2H4 reacting, how much ...
Friday, October 23, 2015 by mara

chemistry
A mercury mirror forms inside a test tube by the thermal decomposition of mercury(II) oxide. 2 HgO(s) 2 Hg(l) + O2(g) Hrxn = 181.6 kJ (a) How much heat is needed to decompose 556 g of the oxide? (b) If 288 kJ of heat is absorbed, how many grams of mercury form?
Friday, October 23, 2015 by mara

chemistry
A 30.5 g sample of an alloy at 94.8°C is placed into 52.1 g water at 22.8°C in an insulated coffee cup. The heat capacity of the coffee cup (without the water) is 9.2 J/K. If the final temperature of the system is 31.1°C, what is the specific heat capacity of the ...
Friday, October 23, 2015 by mara

chemistry
One piece of copper jewelry at 104°C has exactly twice the mass of another piece, which is at 43.0°C. Both pieces are placed inside a calorimeter whose heat capacity is negligible. What is the final temperature inside the calorimeter (c of copper = 0.387 J/gK)?
Friday, October 23, 2015 by mara

Chemistry: gas law
I'm here at a study group with Aaron and while he's stuck on that question, I'm stuck on this one... I think we're gonna take a break but I'd love if someone could help break this down for me. Carbon monoxide, CO, and hydrogen, H , react according to the ...
Friday, October 23, 2015 by sydney

Chemistry
Now, my problem with this question is the break-down, I don't know where to start. Calculate the volume of H (g), measured at 21.9°C and 769 Torr required to react with 36.3 L CO(g), also measured at 21.9°C and 769 Torr. Assume the gases react as follows. 3CO(g) + ...
Friday, October 23, 2015 by Aaron

Chemistry
2 NH ClO (s) ---> 4 H O(g) + Cl (g) + 2 O (g) + N (g) In an experiment, 4.56 g NH ClO decomposes completely in a rigid 5.00-L container. What is the total pressure in the container if the final temperature is 229 C? Give your answer in atmospheres, accurate to three ...
Friday, October 23, 2015 by Denice

Chemistry
Write the following into a balanced equation. a) When a mixture of copper (II) oxide and carbon is heated, elemental copper forms and carbon monoxide evolves into the atmosphere. b) When a concentrated solution of sodium hydroxide is added to an aqueous solution of lead ...
Friday, October 23, 2015 by Royce

chemistry
What mass of water can be heated from 45C to 88C with 28 kj?
Friday, October 23, 2015 by brianna

Chemistry
For the following redox reaction, provide half reactions that show which species is oxidized and reduced. Indicate the species oxidized, the species reduced, the oxidizing agent and the reducing agent. 3Mg(s) + 2FeCl3(aq) 2Fe(s) + 3MgCl2(aq) *I Figure that Mg is being oxidized...
Friday, October 23, 2015 by David Jackson

chemistry
In winemaking, the sugars in grapes undergo fermentationby yeast to yield CH3CH2OH and CO2. During cellularrespiration, sugar and enthanol are "burned" to water vapor andCO2. A) Using C6H12O6 for sugar, calculate ÄH of fermentation and of respiration(combustion...
Friday, October 23, 2015 by Mark

Chemistry
How many grams of drug X are in 10 mL of a 1:200 solution of X?
Friday, October 23, 2015 by James

Chemistry
In winemaking, the sugars in grapes undergo fermentationby yeast to yield CH3CH2OH and CO2. During cellularrespiration, sugar and enthanol are "burned" to water vapor andCO2. A) Using C6H12O6 for sugar, calculate ÄH of fermentation and of respiration(combustion...
Friday, October 23, 2015 by Mark

chemistry
if there is 10.0g of CO2 in a 20.0L cylinder @ pressure of 0.300 atm and im finding temperature of the CO2 sample does n=10.0g in the equation and should I set it up pv=nRT
Thursday, October 22, 2015 by amy

Chemistry Labwork
The uncertainty in each measured value of K is about + 10%. Are all of your measured values of K within the range (+ 10%) of the average K value? My K values are 343, 342, 341, and 344. My average is 342. I used 3 significant digits. How do I answer this question? I know I am ...
Thursday, October 22, 2015 by Anonymous

AP Chemistry
I'm so sorry to bother you guys again! Stuck on two other questions: 1. In the following equilibrium: NaCl(s) Na+(aq) + Cl–(aq), would adding more NaCl(s) increase the Cl-(aq) concentration? Explain why. My thoughts: I thought that it wouldn't increased the Cl- ...
Thursday, October 22, 2015 by Allie

Chemistry(MOLEDAY)
I created my Mole: MOLE'YMPICS *(Olympics)*... That is my Mole-word or Phrase but Idk if my descriptive caption below would be a phrase. I don't know what my descriptive caption could be. Or at least Idk how to make it FUNNY or HUMOROUS? My original Descriptive caption...
Thursday, October 22, 2015 by Sophia

DMMS
Chemistry What characteristics are shared by all alkali metals and alkaline earth metals? A They conduct electricity very well B They are strong and shiny C They form alkaline solutions when mixed with water D They do not react with water at all
Thursday, October 22, 2015 by Donna

chemistry
How many kJ of energy are released when 2 moles of NO reacts with an excess of ozone O3? How many kJ of energy are released when 44.9 g of NO react with an excess of ozone O3? What is the ΔH for the reverse reaction?
Thursday, October 22, 2015 by Anonymous

Chemistry
Are my answers correct? Calculate the molarity: a) 0.500 mol of NaOH in 2.45 L of solution. b) 24.1 g of NaCl in 853 mL of solution. a: 0.2 M b: 0.49 M
Thursday, October 22, 2015 by Robert

chemistry
The complete combustion of ethanol, C2H5OH (FW = 46.0 g/mol), proceeds as follows: C2H5OH(l) + 3 O2(g) → 2 CO2(g) + 3 H2O(l) ΔH = −555 kJ What is the enthalpy change for combustion of 15.0 g of ethanol
Thursday, October 22, 2015 by sharon

Chemistry
A gas has a volume of 2.5 L at 25 degrees Celsius and 742 mmHg. Calculate the volume at 55 degrees celsius and 825 mmHg. I got 2.5 L again. Is that possible?
Thursday, October 22, 2015 by David D.

Chemistry
1. Cisplatin is an anti tumor agent. It has the molecular formula Pt(NH3)2Cl2. How many grams of cisplatin can be produced if the limiting reactant is 1 kg of platinum? I got 1538.1 g Pt(NH3)2Cl2. 2. Hydrogen cyanide is used in the production of cyanimid fertilizers. It is ...
Thursday, October 22, 2015 by Anonymous

Chemistry
1. If you had 1.73 moles of hydrogen (H2) and 0.89 moles of oxygen (O2), which would be the limiting reactant? How many moles of water can you produce from your supply of hydrogen and oxygen? My answers: H2 is the limiting reactant because it produces the least amount of ...
Thursday, October 22, 2015 by Anonymous

Chemistry
Nitrogen dioxide reacts with water to form nitric acid and nitrogen monoxide according to the equation: 3 NO2 (g)+ H2O (l) --> 2HNO3 (l) + NO (g) Suppose that 5 mol NO2 and 1 mol H2O combine and react completely. How many moles of the reactant in excess are present after ...
Thursday, October 22, 2015 by Anonymous

chemistry
what is the
Wednesday, October 21, 2015 by brandy

chemistry
what is the pH of .001M solution of acid (pKa=3)
Wednesday, October 21, 2015 by brandy

Chemistry
Consider the following reaction between sulfur trioxide and water: SO3(g)+H2O(l)→H2SO4(aq) A chemist allows 61.5 g of SO3 and 11.2 g of H2O to react. When the reaction is finished, the chemist collects 59.0 g of H2SO4.
Wednesday, October 21, 2015 by Anonymous

Chemistry
What volume of 0.159 M Na3PO4 solution is necessary to completely react with 92.6 mL of 0.119 M CuCl2?
Wednesday, October 21, 2015 by Anonymous

Chemistry
if a photon of light has an energy of 2.35x10^-19 J, calculate the frequency and wave length. What solution do I use to get the answer?
Wednesday, October 21, 2015 by Nicole

Chemistry
Suppose you suspect that your unknown is either copper (II) nitrate or copper (II) sulfate. You decide to add NaOH to your known as a test reagent. Will this test distinguish between the two possibilities? If not, could you suggest a different test?
Wednesday, October 21, 2015 by Pat

Chemistry
Please check the following. 1. What is the empirical formula of the compound C6O6H14? A. C3O3H7 B. CO2H C. C12O12H28 D. COH2 My answer: A.C3O3H7 2. The diameter of an atom is approximately 1x10^-10 meter. What is the diameter in millimeters? A. 1 x10^-12 mm B. 1 x10^-13 mm C. ...
Wednesday, October 21, 2015 by Anonymous

Chemistry
A sample of calcium fluoride with a mass of 15.0 g contains 8.40 g of calcium. Assuming that the sample is pure calcium fluoride, how much calcium would be present in a 30.0 g sample? My answer: 16.8 g Ca Based on your answer and applying what you know about calcium fluoride, ...
Wednesday, October 21, 2015 by Anonymous

chemistry
An intercontinental ballistic missile (ICBM) travels at an average speed of 7.03km/sec. The missile contains 459.0Mg of fuel. The fuel is burned at a rate of 313 pounds per second. What would be the maximum distance (in km) the missile could travel until it ran out of fuel? ...
Wednesday, October 21, 2015 by tate

Chemistry
You discover a chunk of white shiny metal and want to know what it is made of. So, you have it analyzed by mass spectrometry and you see two peaks of different heights, according to the data shown below: Peak 1 - mass (amu): 106.90509 -relative peak height (%): 53.875% Peak 2...
Wednesday, October 21, 2015 by Anonymous

Chemistry
A balloon contains 7.2 L of He. Th e pressure is reduced to 2.00 atm and the balloon expands to occupy a volume of 25.1 L. What was the initial pressure exerted on the balloon? I got 0.57 ml, but the answer says 7.0 ml. I am not sure if my answer is wrong of correct?
Wednesday, October 21, 2015 by David D.

chemistry
A volume (54.2 L) of gas at 1150 mmHg is subjected to a new pressure of 3450 mmHg, at constant temperature. What volume in liters (L) does the gas now occupy
Wednesday, October 21, 2015 by casey

Chemistry
Explain the role ch3co2na in the preparation of fe(c5h7o2)3
Wednesday, October 21, 2015 by Bebe

Chemistry
an object with a mass of 24g and a volume of 32ml is most likely what substance
Wednesday, October 21, 2015 by Jennifer

Chemistry
Explain the role of CH3CO2Na n the preparation of Fe(C5H7O2)3)3
Wednesday, October 21, 2015 by Bebe

Chemistry
Explain why you are instructed to wash the collected crystals with distilled water instead of a water-methanol mixture.
Wednesday, October 21, 2015 by Bebe

Chemistry
How would using 0.42 grams CH3CO2Na times 3H2O instead of the amount called for in the procedure change the theoretical yield of Fe(C5H7O2)3? Briefly explain. We used 5 grams of CH3CO2Na times 3H2O.
Wednesday, October 21, 2015 by Anonymous

Chemistry
Briefly explain the role of CH3CO2Na in the preparation of Fe(C5H7O2)3.
Wednesday, October 21, 2015 by Anonymous

Chemistry
Write a balanced net ionic reaction for the reduction of cupric ion (Cu2+) by hydroxylamine (NH2OH) in acid solution, using the smallest integer coefficients. Im not too sure of what is reacting here to reduce the Cu2+. Help?
Wednesday, October 21, 2015 by Ronnie

Chemistry
A line in the Balmer series of hydrogen has a wavelength of 486 nm. From what state did the electron originate? In what region of the electromagnetic spectrum is this line observed?
Wednesday, October 21, 2015 by Caitlin

Chemistry
The cooling system in an automobile holds 10.0 L of ethylene glycol antifreeze. How much energy is absorbed when the temperature of the ethylene glycol goes from 20°C to 100°C? The density and specific heat capacity of ethylene glycol are 1.11 g/mL and 2.42 J/(g •...
Wednesday, October 21, 2015 by Derek

Chemistry
A solution is prepared by dissolving 0.1 mol of ethanoic acid (CH3COOH) in 500ml of water at 25 C. pKa of ethanoic acid is 4.7. What is the pH of the solution? I'm assuming the equation is pH = pKa + log[Base]/[Acid] but can't get it to work?
Wednesday, October 21, 2015 by Becca

organic chemistry
How to find the volume of hot water required to dissolve the mass of acid, if we have 20g of benzoic acid contaminated with 0.4g of salicylic acid? What is the mass of benzoic acid which participates when the solution is cooled to 20°C? Deduce. What is the mass of ...
Wednesday, October 21, 2015 by Anonymous

chemistry..anybody!
I don't know why it was marked wrong. This is what it said: Where is the 5.64 coming from? Is this a typo?(thank you) HINT To balance the equation, make sure that the number of each atom on the reactant side is the same as the number on the product side. Should the ...
Wednesday, October 21, 2015 by patrick

chemistry
Given 20g of benzoic acid contaminated with 0.4g of salicytic acid. 1)Determine the volume of hot water required to dissolve the mass of acid. 2)Calculate the mass of benzoic acid which participates when the solution is cooled to 20°C. Deduce. 3)Calculate the mass of ...
Wednesday, October 21, 2015 by Jenny

chemistry
A runner eats granola bars for energy on her 100.0 mile run. Each bar contains 250.1 calories. She burns 96.15 calories per km that she runs. How many granola bars does she need to equal the number of calories that she burns?
Tuesday, October 20, 2015 by Anonymous

Chemistry
A liquid has a density of 4.32 pounds/gallon. What is the mass in kg of 3.201 liters of this liquid? Possible Answers: A) 1.66*10^3kg B) 23.7 kg C)8.05*10^-6kg D)0.0888kg E)1.27kg F) none of the above
Tuesday, October 20, 2015 by Tahne

Chemistry
a runner eats granola bars for energy on her 100.0 mile run. Each bar contains 250.1 calories She burns 96.15 calories per km that she runs. How many granola bars does she need to equal the number of calories that she burns? There are also answers to choose from: a)39 bars, b)...
Tuesday, October 20, 2015 by Taylee

Chemistry
Microwaves, such as those used for radar and to heat food in a microwave oven, have wavelengths greater than about 3 mm. What is the frequency of radiation of wavelength 13.82 mm?
Tuesday, October 20, 2015 by C

Chemistry DR BOB help!!
I don't know why it was marked wrong. This is what it said: Where is the 5.64 coming from? (thank you) HINT To balance the equation, make sure that the number of each atom on the reactant side is the same as the number on the product side. Should the enthalpy change for ...
Tuesday, October 20, 2015 by patrick

Chemistry DR BOB help!!
I don't know why it was marked wrong. This is what it said: Where is the 5.64 coming from? (thank you) HINT To balance the equation, make sure that the number of each atom on the reactant side is the same as the number on the product side. Should the enthalpy change for ...
Tuesday, October 20, 2015 by patrick

chemistry
Calculate the volume, in milliliters, of a 0.290 M LiOH solution that will completely neutralize each of the following: a. 40.0 mL of a 0.130 M H3PO4 solution b. 24.5 mL of a 0.535 M H2SO4 solution
Tuesday, October 20, 2015 by Chris

chemistry
If 5.00 g of PCl5 is reacted with excess water, how many grams of H3PO4 and HCl would be produced?
Tuesday, October 20, 2015 by tricia

chemistry
What is the unbalanced equation for the combustion reaction of gaseous C4H10 and gaseous oxygen to form gaseous carbon dioxide and gaseous water?
Monday, October 19, 2015 by vincent

chemistry
prepare a phosphate buffer with pH= 7 from solid NaH2PO4 (pKa =7.21) and Na2HPO4. 1) calculate the ratio of [CB]/[acid] I got the ratio as 0.62 2) calculate the mass of each component required to make 1L of a .1 M buffer solution 3) if the pH is 7.10, how would you adjust it ...
Monday, October 19, 2015 by prepare a phosphate buffer with pH= 7

chemistry please help!
Calculate the enthalpy of the reaction of boron trioxide with steam: B2O3(s) + 3H2O(g) → 3O2(g) + B2H6(g) Given: H2O(l) H2(g) + 1⁄2 O2(g) 2B(s) + 3H2(g) 2B(s) + 3/2 O2(g) → B2O3(s) → H2O(g) → H2O(l) → B2H6(g) 44 kJ/mol -286 kJ/mol 36 kJ/mol...
Monday, October 19, 2015 by Lay

chemistry
Nitroglycerin is shock sensitive, and decomposes explosively: 4C3H5N3O9(l) → 12CO2(g) + 6N2(g) + O2(g) + 10H2O(g) ΔHf° -370 -393.5 -241.8 a. What is the molar enthalpy of decomposition (detonation) of nitroglycerin? b. Calculate the change in internal energy (&#...
Monday, October 19, 2015 by Lay

chemistry
10mL of 0.500M HCl was added to 50mL of 0.100M NaOH in a coffee cup calorimeter, and the temperature increased from 22.3°C to 23.1°C. What is the experimentally determined enthalpy of neutralization of HCl (in kJ/mol)? The specific heat of water is 4.184J/g•°C...
Monday, October 19, 2015 by Lay

chemistry
Nitromethane (CH3NO2) is a liquid fuel that is used in top fuel drag racing and model airplane engines. A 0.57g sample of nitromethane was placed in the constant volume (bomb) calorimeter. The temperature of the calorimeter rose from 23.25°C to 24.73°C. What is the ...
Monday, October 19, 2015 by Lay

chemistry
A constant volume (bomb) calorimeter was calibrated in an analytical laboratory by burning 1.057g of benzoic acid (C7H6O2) which has an enthalpy of combustion of -3228 kJ/mol. The temperature of the calorimeter rose from 22.75°C to 29.00°C. What is the heat capacity of...
Monday, October 19, 2015 by Lay

chemistry
Can a substance,that cannot be electrolysed,conduct electricity?Why?
Monday, October 19, 2015 by sujal

CHEMISTRY!!!
12.) If 4.75 * 10^23 atoms of silver are placed on one side of a platform balance, how many atoms of gold should be placed on the other side to balance this quantity of silver? Atoms to Atoms? How would I convert that. It's kind of live a division problem too but how to ...
Monday, October 19, 2015 by Allie

Organic Chemistry
Why is methylene chloride (dichloromethane) used to extract eugenol from cloves, and not toluene?
Monday, October 19, 2015 by Sasha

Chemistry
If you add 14g of Hydrogen to excess oxygen, how much water should form?
Monday, October 19, 2015 by michael

Chemistry
when potassium in water are combined they produced 4000.0 kJ of heat along with potassium hydroxide and hydrogen gas. how much energy would be produced if you dumped a 1.00 kg chunk of potassium into a swimming pool? s this reaction what is the enthalpy change?
Monday, October 19, 2015 by Al

Chemistry
12.) If 4.75 * 10^23 atoms of silver are placed on one side of a platform balance, how many atoms of gold should be placed on the other side to balance this quantity of silver? Atoms to Atoms? How would I convert that. It's kind of live a division problem too but how to ...
Monday, October 19, 2015 by Allie

Chemistry
When methane is combusted with excess oxygen 891 kJ of energy is produced start with 100g of methane. how much energy is produced? is this reaction endothermic or exothermic? Also provide enthalpy change for this reaction: CH4 + 2O2 (arrow)= CO2 + H2O + 891 kJ
Monday, October 19, 2015 by Al

chemistry!!!!!!!!!
at 20°C the concentration of O2 in the air is 8.65 x10-3 mol/L. what us the minimum volume of air in litres that are required to completely combust on e litre of gasoline at 20°C? Assume the gasoline is octane which has a density of .703 g/mol at this temperature. The ...
Monday, October 19, 2015 by alyssa

chemistry
1.) How many carbon atoms are contained in a 1.500 carat diamond (carbon) if 1 caret =200.0 mg? _____________________________ I don't know if I'm doing this right but I tried. Can someone help? 1.500 carat diamond (C) *(200.0 mg/1 caret) ... ...
Monday, October 19, 2015 by Allie

Chemistry
Write a balanced net ionic reaction for the reduction of cupric ion (Cu2+) by hydroxylamine (NH2OH) in acid solution, using the smallest integer coefficients. (Do not include symbols for state of matter in your answer). in order for this to reduce Cu+2 to Cu+, the ...
Monday, October 19, 2015 by Joseph

Chemistry
Why does the temperature in exothermic reactions increase, reach a maximum, and then decrease?
Monday, October 19, 2015 by Lena

Chemistry
Would there be any effect on the amount of precipitate of CaCO3 if tap water contained Ca 2+ were used? Explain.
Monday, October 19, 2015 by Renee

CHM 312L
Experiment: Thermodynamics of Real Gases Chemistry 311L (Heat Capacity Ratio and the Joule-Thomson Effect) question: Imagine that you forget that an oil manometer measures pressures above atmospheric. What will happen to your calculated heat capacity ratios, and why?
Monday, October 19, 2015 by nina

chemistry
The pressure of a mixture of H2 & N2 in container in 1200 torr.The partial pressure of N2 in the mixture is 300 torr.What is the ratio of H2 and N2 molecules in the mixture torr?
Monday, October 19, 2015 by Randeep

Chemistry
What would happen to the peaks on your chromatogram for substances that do not separate?
Monday, October 19, 2015 by Andrew

Chemistry
Which substances are not ionized in a aqueous solution? Hi, KBr, H2SO4, HNO2, AgCl, Ca(NO3)2
Monday, October 19, 2015 by Chelsea

Chemistry
A vessel initially contains pure A at a pressure of 1.0 bar. The total pressure of all gases at equilibrium is 1.5 bar. What is K for this reaction? A (g) <--> B (g) + C (g)
Monday, October 19, 2015 by Ash

Chemistry
A 10.0 mL aliquot of a flouride sample solution was diluted to 250 mL in a volumetric flask. The F- concentration of this DILUTED sample was determined with a F- ion selective electrode and found to be 7.1 mg/L. What is the concentration of F- in the original, undiluted sample...
Monday, October 19, 2015 by Ronnie

chemistry
What would happen to the peaks on your chromatogram for substances that do not separate? How are transmittance values are affected by the amount of sample on your salt plate?
Monday, October 19, 2015 by Andrew

chemistry
the density of acetone is 0.7899 g/cm-3. If 2mL of acetone is vaporized at 84 C and atmospheric pressure, what would the volume be in liters?
Monday, October 19, 2015 by Lynn Wilson

chemistry
A voltaic cell can be built using the reaction between Al metal and O2 from the air. If the Al anode of this cell consists of 65 g of aluminum, how many hours can the cell produce 1.5 A of electricity, assuming an unlimited supply of O2?
Sunday, October 18, 2015 by maddie

Organic Chemistry
What is the solubility, in mg/mL, of a 50% water/50% methanol solution at 73.5 degrees Celsius? Is there a table available online somewhere?
Sunday, October 18, 2015 by Sasha

Chemistry
arrange CO2, N2O2, CaO, SiO2, and Ga2O3 in order of increasing acidity
Sunday, October 18, 2015 by Heather

Chemistry
How can I tell from a graph of temperature vs. time if a reaction is endothermic or exothermic?
Sunday, October 18, 2015 by Christina

Chemistry
A solution of NH3 in water has a pH of 11.17. Calculate it's molarity
Sunday, October 18, 2015 by Rita

Analytical Chemistry
A 10.0 mL sample of whiskey was diluted to 500.0 mL. A 4.00 mL aliquot of the diluted sample was removed and the ethanol, C2H5OH, was distilled into 50.00 mL of 0.02150 M K2Cr2O7 and oxidized to acetic acid. The excess Cr2O72– was then back titrated with 17.1 mL of 0.1275...
Sunday, October 18, 2015 by Kristin

Chemistry
A 1.50 g sample of glucose (C6H12O6) is burned in a bomb calorimeter that contains water at 25.0 0C. The heat capacity of the bomb calorimeter is 1046 J/0C. When the glucose is combusted, the temperature of the water rises to 47.4 0C. Calculate the heat of combustion of ...
Sunday, October 18, 2015 by Mark

Chemistry
A compound isolated from oil of mint has a characteristic cool, refreshing odour. It is frequently used in cough drops to ease the pain of a sore throat. This compound contains only C, H, and O. If 95.6 mg of this compound burns completely in O2, and yields 269 mg of CO2 and ...
Sunday, October 18, 2015 by Chelsea

Chemistry
A sample of gas in a cylinder of volume 3.64 L at 275 K and 2.68 atm expands to 7.04 L by two different pathways. Path A is an isothermal, reversible expansion. Calculate the work for Path A. Answer in units of J What I did was basically W=-P(delta V) Which was -(2.68 atm)(3.4...
Sunday, October 18, 2015 by Alex

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