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October 20, 2014

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

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chemistry
magnesium chlorate under goes decompostion, oxgen gas is realsed in the following reaction: 2KClO3 → 2KCl + 3O2 when 3.50 grams of potassuim chlorate is decomposed at STP, how many litters of oxgen will be produced?
Saturday, March 1, 2014 at 5:34pm

chemistry
A buffer solution is prepared by mixing 99.0 mL of 0.450 M HF and 55.0 mL of 1.15 M NaF. Determine the pH of the solution after the addition of 0.01 moles NaOH (assume there is no change in volume when the NaOH is added).
Saturday, March 1, 2014 at 4:47pm

chemistry
What is the molality of a solution made by adding 0.130 g of zinc sulfite to 151 ml water?
Saturday, March 1, 2014 at 4:41pm

Chemistry
Based on your observation, how would you precipitate BaCrO4 (s) from a solution of Ba(NO3)2 and K2Cr2O7 2-? Need to show chemical equation and explain.
Saturday, March 1, 2014 at 3:54pm

chemistry
Hello, a few questions: Thanks so much! 1. The heat capacities of titanium and water are 0.522 J g-1 K-1 and 4.184 J g-1 K-1, respectively. What is the final temperature of the titanium-water mixture if a 175.0-g sample of titanium, initially at 90.0oC, is added to 50.0 g of ...
Saturday, March 1, 2014 at 3:51pm

chemistry
when magnesium chlorate under goes decompostion, oxgen gas is realsed in the following reaction: 2KClO3→ 2KCl + 3O2 when 3.50 grams of potassuim chlorate is decomposed at STP, how many litters of oxgen will be produced?
Saturday, March 1, 2014 at 3:05pm

chemistry
at a certain temperature 800 mole of so3 is placed in a 4.00-l container. 2SO3(g)<-->2SO2(g)+O2(g) at equilibrium, 0.120 mol of o2 is present. calculate kc
Saturday, March 1, 2014 at 3:02pm

chemistry
how to calculate the amount of heat in calories absorbed when 50.0 g of water at 20 degrees C spreads over your skin and warms the body temperature, 37 degrees C
Saturday, March 1, 2014 at 1:58pm

Chemistry
The value of KC for the interconversion of butane and isobutane is 2.5 at 25°C. If you place 0.067 mol of butane in a 0.250-L flask at 25°C and allow equilibrium to be established, what will be the concentrations of the two forms of butane? A)[butane] B)[isobutane]
Saturday, March 1, 2014 at 12:46pm

Chemistry
How has crude oil changes the country (positive and negative points)
Saturday, March 1, 2014 at 5:00am

chemistry
what is the disadvantage of nh4oh
Friday, February 28, 2014 at 8:35pm

Chemistry
Carbonates react with acids to form a salt, water and carbon dioxide gas. When 22.1 g of calcium carbonate are reacted with sufficient hydrochloric acid, how many grams of calcium chloride will be produced?
Friday, February 28, 2014 at 7:52pm

Chemistry
A cell was constructed with two lead electrodes. The electrolyte compartment is 1 M Pb(NO3)2 (aq). In the other compartment, NaI has been added to a Pb(NO3)2 solution until a yellow precipitate forms and the concentration of I- ions is .5 M. The potential of the cell is .155 V...
Friday, February 28, 2014 at 3:00pm

Chemistry
The values on the label of a bottle of nitric acid are specific gravity 1.42 and assay 60%. Use these values to determine the molarity of the solution. Show your work.
Friday, February 28, 2014 at 1:54pm

chemistry
use the Henderson-Hasselbalch equation to calculate the pH of a buffer solution prepared by mixing equal volumes of 0.20 M NaHCO3 and 0.10M Na2CO3.(Ka=5.6x10^-11). how would you prepare NaHCO3-Na2CO3 buffer solution that has the pH of 10.40.
Friday, February 28, 2014 at 1:40pm

Analytical Chemistry
Match the following terms about analytical precipitations to their definitions: A.) Coprecipitation B.) Adsorption C.) Absorption D.) Gathering E.) Masking F.) Digestion G.) Peptization 1.) Inclusion or occlusion of impurities within a crystal. 2.) Binding of impurities to the...
Friday, February 28, 2014 at 1:20pm

chemistry
Given an approximate wavenumber of 2000cm-1 for CN, calculate the approximate force constant for a single bond. i used the formula v= (1/2(pi)c) * sqrt(k/u) where pi is 3.14, c is the speed of light, k is the force constant and u=mu, which is the reduced mass. i got a value of...
Friday, February 28, 2014 at 12:41pm

Chemistry
Urea (NH2)2CO is prepared by reacting ammonia with carbon dioxide. The byproduct is water. 637.2g of ammonia are reacted with 787.3 g of carbon dioxide. a. (15 points) Which of the two reactants is a limiting reactant? Show your calculations (including the correctly balanced ...
Friday, February 28, 2014 at 5:21am

Chemistry
What is true about the element francium (Fr, atomic number 87)? Choose all that apply. A) It has seven valence electrons. B) It is likely to form ionic bonds. C) It is in Period 7. D) It is nonmetal. E) It is a metal. I think it is B, C, and E?
Friday, February 28, 2014 at 1:30am

Chemistry
Consider the following equation: TiCl4(g) + 2Mg(l) → Ti(s) + 2MgCl2(l) 3.54×107g of TiCl4(g) are reacted completely. If 7.91×106g of Ti(s) is actually obtained, calculate the % yield.
Thursday, February 27, 2014 at 9:28pm

Chemistry
Urea (NH2)2CO is prepared by reacting ammonia with carbon dioxide. The byproduct is water. 637.2g of ammonia are reacted with 787.3 g of carbon dioxide. a. Which of the two reactants is a limiting reactant? Show your calculations (including the correctly balanced chemical ...
Thursday, February 27, 2014 at 9:17pm

Chemistry
If 25g of lead phosphate reacts with an excess of sodium nitrate, how many dreams of sodium phosphate is produced?
Thursday, February 27, 2014 at 9:06pm

Chemistry (Thermodynamics)
Write a balanced equation for the complete combustion of 1 mole of ethyne gas (C2H2) ?
Thursday, February 27, 2014 at 9:03pm

Chemistry
If say 70 mL of water is heated vs 100 mL of water, would the temperature be different or does the amount of the substance not make a difference on the temperature Thanks!
Thursday, February 27, 2014 at 8:59pm

Chemistry
5.3g of magnesium reacts with excess HCI. How many liters of hydrogen gas will be produced?
Thursday, February 27, 2014 at 8:13pm

Chemistry
Same with these: How do you do them? 1.)What is the mass at 20 degrees Celsius of 5 liters of air? 2.)What is the volume in liters of a kilogram of ice at 0 degrees Celsius? 3.)What is the mass of a bar of aluminum measuring 1.0cm by 1.0cm by 10.0cm?
Thursday, February 27, 2014 at 6:34pm

Chemistry
Use standard enthalpies of formation to determine ΔHorxnfor: 3NO2(g) + H2O(l) → 2HNO3(aq) + NO(g) -133.5 = Delta H Find the change in internal energy for this reactioion.. ???? In KJ
Thursday, February 27, 2014 at 6:27pm

Chemistry
Same with these: How do you do them? 1.)What is the mass at 20 degrees Celsius of 5 liters of air? 2.)What is the volume in liters of a kilogram of ice at 0 degrees Celsius? 3.)What is the mass of a bar of aluminum measuring 1.0cm by 1.0cm by 10.0cm?
Thursday, February 27, 2014 at 6:12pm

Chemistry
The speed limit on a certain highway is 72km/h. What is the speed in cm/s? Could you go through each step on how to get the answer? Lots of the questions are like this one, but I don't know how to do them.
Thursday, February 27, 2014 at 6:04pm

Chemistry
Predict the standard cell potential and calculate the standard reaction Gibbs free energy for galvanic cells having the following cell reactions: a.)3Zn + 2Bi3+ = 3Zn2+ + 2Bi b.)2H2 + O2 = 2H20 in acidic solution c.)2H2 + O2 = 2H20 in basic solution d.)3Au+ = 2Au + Au3+ I ...
Thursday, February 27, 2014 at 5:52pm

Chemistry
Calculate the standard reaction Gibbs free energy for the following cell reactions: a.)3Cr3+(aq) + Bi(s)= 3Cr2+(aq) + Bi3+(aq) with Ecell=-.61V b.)Mg(s) + 2H20(l)=Mg2+(aq)+H2(g)+2OH-(aq) with Ecell=2.36 V I know the formula. I just need help figuring out n (change in number of...
Thursday, February 27, 2014 at 4:34pm

Chemistry
If 507 g FeCL2 were used up in the reaction FeCL2 + 2NaOH > Fe(OH)@(s) + 2NaCL, how many grams of Fe(OH)2 would be formed?
Thursday, February 27, 2014 at 1:13pm

chemistry
what volume would 4.3 moles of hydrogen gas occupy at 45 degrees and 3.22 atm?
Thursday, February 27, 2014 at 10:19am

chemistry
A set of bookshelves rests on a hard floor surface on four legs, each having a cross-sectional dimension of 3.9 6.5 cm in contact with the floor. The total mass of the shelves plus the books stacked on them is 260. kg. Calculate the pressure in pascals exerted by the shelf ...
Thursday, February 27, 2014 at 12:05am

chemistry
a solution of 2.5 M weak acid is .52% ionized. what is the Ka value of this acid? ive been stuck on this one for a long time and cant figure out where to even start...if someone could walk me through this itd be great! thanks
Wednesday, February 26, 2014 at 8:58pm

Chemistry
A sample of oxygen gas at 295 kPa takes up 456 L of space at standard temperature (the “T” in STP). What is the new volume when the pressure is lowered to standard pressure (the “P” in STP)?
Wednesday, February 26, 2014 at 8:02pm

Chemistry
Calculate the volume of .100M NaOH that must be added to reach ph of 3 in the titration of 25.00 mL of .100M HCl
Wednesday, February 26, 2014 at 7:44pm

Chemistry help!
A sample of gas at a temperature of 37.0°C has a pressure of 725 torr and occupies a volume of 3.44 L. a. Use Boyle’s law to calculate the new pressure if the temperature is held constant and the volume is increased to 6.54 L. torr b. Use Gay-Lussac’s law to ...
Wednesday, February 26, 2014 at 6:46pm

Chemistry
a. How many moles of N2 are present in a 1.00 qt flask that has a pressure of 425 torr at a temperature of 35°C? What is the mass in this na2? It would be much simpler to change quart to liters first, then torr to kpa PV=nRT n= PV/RT Temps in Kelvins, V in liters, P in ...
Wednesday, February 26, 2014 at 5:57pm

Chemistry
1. Consider a 1.00g unknown sample that contains 62.0% sodium carbonate and 38.0% sodium bicarbonate, NaHCO3, by mass. When this sample is dissolved in water, how many mL of 0.200M HCl will be required to convert all of the carbonate to bicarbonate? How many mL will be ...
Wednesday, February 26, 2014 at 5:03pm

Chemistry
a. How many moles of N2 are present in a 1.00 qt flask that has a pressure of 425 torr at a temperature of 35°C? What is the mass in this na2? It would be much simpler to change quart to liters first, then torr to kpa PV=nRT n= PV/RT Temps in Kelvins, V in liters, P in kpa...
Wednesday, February 26, 2014 at 4:39pm

Chemistry
150.0 mL flask contains 740. g of N2 at 0°C. What is the pressure in atm. What is the pressure in torr? What is the pressure in psi? I know you have to do: n = grams/molar mass Then PV = nRT R in 0.08206 L.atm/mol.K gives P in atm atm x 760 = p in torr 1 atm = 14.7 psi
Wednesday, February 26, 2014 at 4:37pm

Chemistry
A mixture of gases contains 0.65 mol of N2, 0.70 mol of O2, and 0.90 mol of He. What is the partial pressure of each gas (in atm and in torr) in a 25.0 L cylinder at 340 K? What is total pressure? I know you: Use mols each gas in PV = nRT and solve for p. Then Ptotal = pN2 + ...
Wednesday, February 26, 2014 at 4:36pm

Chemistry
At a temperature of 57oC, a gas inside a 5.30 L metal canister has a pressure of 4000 torr. If the temperature is decreased to 13oC (at constant volume), what is the new pressure of the gas? I know you use the formula (P1/T1) = (P2/T2)
Wednesday, February 26, 2014 at 4:35pm

Chemistry
At a pressure of 2.4 atm a balloon has a volume of 9.8 L. If the pressure is decreased to 0.96 atm (at constant temperature), what is the new volume of the balloon. I know you use the formula P1V1 = P2V2
Wednesday, February 26, 2014 at 4:34pm

Chemistry
A 630. mL flask contains O2 at a pressure of 0.75 atm and a temperature of 20°C. What mass of O2 is present? I know you Use PV = nRT and solve for n = number of mols gas. Then n = grams/molar mass and solve for grams. But I get the wrong answer
Wednesday, February 26, 2014 at 4:33pm

Please help with Chemistry?????
5.00 mL of 2.00x10^-3M Fe(NO3)3 is mixed with 4.03 mL of 2.00x10^-3M NaSCN and 1.08 mL of 0.1M HNO3, for a total volume of 10.11 mL. a) What is the initial concentration of the Fe(NO3)3 in the mixed solution? b) What is the initial concentration of the NaSCN in the mixed ...
Wednesday, February 26, 2014 at 3:18pm

Please help with Chemistry?????
A standard solution with a FeSCN2+ concentration of 1.55x10^-4M has a percent transmittance (%T) of 18.8%. Another solution of unknown FeSCN2+ concentration has a percent transmittance of 44.8%. A) Calculate the absorbance (A) of each solution. B) Using the absorbances ...
Wednesday, February 26, 2014 at 3:17pm

Chemistry
a. How many moles of N2 are present in a 1.00 qt flask that has a pressure of 425 torr at a temperature of 35°C? What is the mass in this na2?
Wednesday, February 26, 2014 at 3:09pm

Chemistry
A 150.0 mL flask contains 740. g of N2 at 0°C. What is the pressure in atm. What is the pressure in torr? What is the pressure in psi?
Wednesday, February 26, 2014 at 3:07pm

Chemistry
EOC Problem 6.046 A mixture of gases contains 0.65 mol of N2, 0.70 mol of O2, and 0.90 mol of He. What is the partial pressure of each gas (in atm and in torr) in a 25.0 L cylinder at 340 K? What is total pressure?
Wednesday, February 26, 2014 at 3:05pm

Chemistry
At a temperature of 57oC, a gas inside a 5.30 L metal canister has a pressure of 4000 torr. If the temperature is decreased to 13oC (at constant volume), what is the new pressure of the gas?
Wednesday, February 26, 2014 at 3:03pm

Chemistry
At a pressure of 2.4 atm a balloon has a volume of 9.8 L. If the pressure is decreased to 0.96 atm (at constant temperature), what is the new volume of the balloon?
Wednesday, February 26, 2014 at 3:02pm

Chemistry
A 630. mL flask contains O2 at a pressure of 0.75 atm and a temperature of 20°C. What mass of O2 is present?
Wednesday, February 26, 2014 at 3:01pm

Chemistry
A standard solution with a FeSCN2+ concentration of 1.55x10^-4M has a percent transmittance (%T) of 18.8%. Another solution of unknown FeSCN2+ concentration has a percent transmittance of 44.8%. A) Calculate the absorbance (A) of each solution. B) Using the absorbances ...
Wednesday, February 26, 2014 at 2:39pm

Chemistry
5.00 mL of 2.00x10^-3M Fe(NO3)3 is mixed with 4.03 mL of 2.00x10^-3M NaSCN and 1.08 mL of 0.1M HNO3, for a total volume of 10.11 mL. a) What is the initial concentration of the Fe(NO3)3 in the mixed solution? b) What is the initial concentration of the NaSCN in the moxed ...
Wednesday, February 26, 2014 at 2:36pm

Chemistry please help
In lab, I weighed out and found the molarity of 1.108g Na2C2O4 and 1.100g K3Fe(C2O4)3. I titrated an average of 0.0335L of the sodium oxalate solution with KMnO4(potassium permanganate). I then titrated an average of 0.0169L of K3Fe(C2O4)3 X 3H2O with potassium permanganate. I...
Wednesday, February 26, 2014 at 2:31pm

Lab/Chemistry
In lab, I weighed out and found the molarity of 1.108g Na2C2O4 and 1.100g K3Fe(C2O4)3. I titrated an average of 0.0335L of the sodium oxalate solution with KMnO4(potassium permanganate). I then titrated an average of 0.0169L of K3Fe(C2O4)3 X 3H2O with potassium permanganate. I...
Wednesday, February 26, 2014 at 1:10pm

Chemistry
The ionization constant Ka of an indicator HIn is 1.0x10^-6. The color of the nonionized form is red and that of the ionized form is yellow. What is the color of this indicator in a solution whose pH is 4.00? (The question mentions that you can use the ratio of HIn/In). I NEED...
Wednesday, February 26, 2014 at 11:17am

Chemistry
A solution has 140 grams of KOH dissovled in 5 L of water. What is the pH ?
Wednesday, February 26, 2014 at 11:10am

Chemistry
9. A solution has 48 grams of LiOH dissovled In 100 L of water. What is its [OH-]? 10. What is the pH of the solution in question 9?
Wednesday, February 26, 2014 at 11:09am

Chemistry
What is the pOH of the solution in the question I asked before this one?
Wednesday, February 26, 2014 at 11:07am

Chemistry
A solution has 0.45 mol of NaOH dissovled in 90 L of water. What is its [OH-]?
Wednesday, February 26, 2014 at 11:07am

Chemistry
A solution has 189 grams of HNO3 dissolved in 1000L of water. What is pH?
Wednesday, February 26, 2014 at 11:05am

Chemistry
How much water is needed to prepare 8M of NaOH solution with 1kg of NaOH pellets?
Wednesday, February 26, 2014 at 9:02am

chemistry
at an equilibrium mixture of PCl5, PCl3, and Cl2 has partial pressures of 217.0 Torr, 13.2 Torr and 13.2 Torr respectively. a quantity of Cl2 is injected into the mixture, and the total pressure jumps to 263.0 Torr (at the moment of mixing). the system then re-equilibrates. ...
Wednesday, February 26, 2014 at 5:14am

Chemistry
A molecular compound has the empirical formula CH2. When 100mg of the compound is dissolved in 1.00 g of benzene, the solution freezes 1.75 degrees celsius lower than pure benzene. The Kf for benzene is 4.90 C/m. What is the MM of the compound?
Wednesday, February 26, 2014 at 1:44am

chemistry
if a college student went into the lab and produced 45 grams of Na2CO3, what is percent yield of this trial?
Tuesday, February 25, 2014 at 11:29pm

chemistry
What is the molarity of a solution composed of 2.23 g of potassium iodide (KI) dissolved in enough water to make 0.181 L of solution? Answer in units of M
Tuesday, February 25, 2014 at 11:25pm

Chemistry
Calculate [OH−] for 1.90mL of 0.190M NaOH diluted to 1.50L .
Tuesday, February 25, 2014 at 9:45pm

Chemistry
One day at the fertilizer factory, your boss Mr. Haber comes to you with a problem. The process used by the factory to produce ammonia,the raw material for your fertilizer, is just not optimized. He would like to modify the conditions to achieve a better yield of ammonia in ...
Tuesday, February 25, 2014 at 9:24pm

Chemistry 1150
Instant cold packs, often used to ice athletic injuries on the field, contain ammonium nitrate and water separated by a thin plastic divider. When the divider is broken, the ammonium nitrate dissolves according to the following endothermic reaction: NH4NO3(s)→NH+4(aq)+NO...
Tuesday, February 25, 2014 at 9:14pm

Chemistry
When 10.00g of phosphorus is burned in O2(g) to form P4O10(s), enough heat is generated to raise the temperature of 2990g of water from 18.0 ∘C to 38.0 ∘C. Calculate the heat of formation of P4O10(s) under these conditions. -------------------------------------- ...
Tuesday, February 25, 2014 at 9:03pm

Chemistry
Calculate the total heat energy needed to convert 110g of ice at -10°C to steam at 110°C..?
Tuesday, February 25, 2014 at 9:02pm

chemistry
Is deltaH standard of TdeltaS standard more important in determining whether KHT will be soluble in water at a given temperature?
Tuesday, February 25, 2014 at 8:48pm

Chemistry
The problem asked to find the amount (in moles) of reactant left. .223moles FeS and .652moles of HCl FeS+2HCl--> FeCl2+H2S .223molFeS(1moleFeCl2/1moleFeS)=.223mole​FeCl2 .652molHCl(1moleFeCl2/2molHCl)=.326moleF​eCl2 .223/.326x100=68.4% used HCL 100-68.4=31.6% ...
Tuesday, February 25, 2014 at 8:30pm

Chemistry
The problem asked to find the amount (in moles) of reactant left. .223moles FeS and .652moles of HCl FeS+2HCl--> FeCl2+H2S .223molFeS(1moleFeCl2/1moleFeS)=.223mole​FeCl2 .652molHCl(1moleFeCl2/2molHCl)=.326moleF​eCl2 .223/.326x100=68.4% used HCL 100-68.4=31.6% ...
Tuesday, February 25, 2014 at 8:30pm

chemistry
which of the following tetrahedral molecules is polar? please explain CH4 CF4 CH3F thanks
Tuesday, February 25, 2014 at 8:18pm

chemistry
what is the correct name for k2o
Tuesday, February 25, 2014 at 8:07pm

Chemistry
The problem asked to find the amount (in moles) of reactant left. .223moles FeS and .652moles of HCl FeS+2HCl--> FeCl2+H2S .223molFeS(1moleFeCl2/1moleFeS)=.223mole​FeCl2 .652molHCl(1moleFeCl2/2molHCl)=.326moleF​eCl2 .223/.326x100=68.4% used HCL 100-68.4=31.6% ...
Tuesday, February 25, 2014 at 8:00pm

chemistry
how much energy is released to the environment by 50.0 grams of condensing water vapor?
Tuesday, February 25, 2014 at 7:47pm

chemistry
what is the solidification for water?
Tuesday, February 25, 2014 at 7:44pm

Chemistry
The empirical formula of a group of compounds is CHCl. Lindane, a powerful insecticide, is a member of this group. The molar mass of lindane is 290.8 g/mol. How many atoms of carbon does a molecule of lindane contain?
Tuesday, February 25, 2014 at 6:24pm

chemistry
You take an aspirin tablet (a compound consisting solely of carbon, hydrogen, and oxygen) with a mass of 1.00 g, combust it under an oxygen atmosphere, and collect 2.20 g of carbon dioxide and 0.400 g water. The molar mass of aspirin is between 170 and 190 g/mol. The molecular...
Tuesday, February 25, 2014 at 6:23pm

Chemistry
Possible Sources of error in a reaction or sodium bicarbonate and acetic acid. Also known as baking soda and vinegar.
Tuesday, February 25, 2014 at 5:42pm

Chemistry
How would I find the collision frequency factor with this information? Slope- -8111.4 EA- 74089.36 j/mol y-int 24.897 1/T .003
Tuesday, February 25, 2014 at 5:14pm

AP Chemistry
Which solution has the highest pH? 1. 0.1 M C6H5NH3Cl, Kb C6H5NH2 = 4.2 × 10−10 2. 0.1 M NH2(OH)2Cl, Kb NH2OH = 6.6 × 10−9 3. 0.1 M NaCl, Kb  zero 4. 0.1 M NH4Cl, Kb NH3 = 1.8 × 10−5 5. 0.1 M CH3NH3Cl, Kb CH3NH2 = 5.0 × 10−4
Tuesday, February 25, 2014 at 4:30pm

Chemistry
The element P (mass no.=39) and Q (mass no. =80) contain 20 and 45 neutrons respectively in their nucleus. Give their electron configuration separately
Tuesday, February 25, 2014 at 4:09pm

College Chemistry
The density of a 0.0122 M KMnO4 is 1.037 g/mL. Suppose 26.35 g of 0.0122 M KMnO4 are required to titrate 1.072 g of a household H2O2 solution. a)Calculate the mL of MnO4^- added to reach the endpoint. b)Calculate the moles of MnO4^- added to reach the endpoint. c)Calculate the...
Tuesday, February 25, 2014 at 3:47pm

Chemistry
Ascorbic acid (vitamin C) is a diprotic acid having the formula H2C6H6O6. A sample of a vitamin supplement was analyzed by titrating a 0.3252 g sample dissolved in water with 0.0284 M NaOH. A volume of 13.27 mL of the base was required to completely neutralize the ascorbic ...
Tuesday, February 25, 2014 at 2:11pm

Chemistry
Ascorbic acid (vitamin C) is a diprotic acid having the formula H2C6H6O6. A sample of a vitamin supplement was analyzed by titrating a 0.3252 g sample dissolved in water with 0.0284 M NaOH. A volume of 13.27 mL of the base was required to completely neutralize the ascorbic ...
Tuesday, February 25, 2014 at 1:48pm

Chemistry
3.a solution has 64 grams of HI dissolved in 250 L of water. what is its [H+] 4. What is the pH of the solution in question #3? 5. A solution has 189 grams of HNO3 dissolved in 1000 L of water. What is pH?
Tuesday, February 25, 2014 at 12:23pm

chemistry
at an equilibrium mixture of PCl5, PCl3, and Cl2 has partial pressures of 217.0 Torr, 13.2 Torr and 13.2 Torr respectively. a quantity of Cl2 is injected into the mixture, and the total pressure jumps to 263.0 Torr (at the moment of mixing). the system then re-equilibrates. ...
Tuesday, February 25, 2014 at 6:42am

CHEMISTRY - SCIENCE
What is the molality of a solution of 50g of I2 (iodine) dissolved in 130 mL of propane. Propane density .49g/mol.
Tuesday, February 25, 2014 at 12:12am

Chemistry
Why is a blank solution used in absorption spectroscopy? I know it is to nullify the reflection, refraction, and diffraction that occurs, but if the blank solution was a dilute solution rather deionized water, how would the concentration of Cr(VI)in a sample be affected?
Tuesday, February 25, 2014 at 12:08am

Chemistry
What atom is indicated by the following electron configuration. 1s^22s^12p^1 ?
Monday, February 24, 2014 at 11:26pm

Chemistry
How does Le Chatelier's principle explain the result you obtained when you add HCL to a suspension of Ca(OH)2 in water? Where the result was, precipitate dissappeared and an increase in temperature resulted.
Monday, February 24, 2014 at 10:51pm

chemistry
A 33.0-L cylinder contains 481 g O2(g) at 22.5°C. What mass of O2(g) must be released to reduce the pressure in the cylinder to 6.16 atm, assuming the temperature remains constant? Thanks! :D
Monday, February 24, 2014 at 10:35pm

chemistry
Suppose that a student calculated Kf of biphenyl to be 81.2C kg/mol. calculate the mass of an unknown if a solution containing 1.64 g of unknown in 18.22 g of biphenyl froze at 39.9 C
Monday, February 24, 2014 at 10:19pm

chemistry
LAST QUESTION: When solid NH4NO3 decomposes, a mixture of gases is obtained: 2 NH4NO3(s)--> 4H2O(g) + O2(g) + 2 N2(g) In an experiment, 5.02 g NH4NO3 decomposes completely in a rigid 5.00-L container. What is the total pressure in the container if the final temperature is ...
Monday, February 24, 2014 at 10:17pm

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