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December 20, 2014

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

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chemistry
Cloves contain two principal essential oils, caryophyllene and eugenol. A student carrying out a steam distillation using cloves obtained a mixture of these two oils in the distillate. Explain how the student could separate and isolate the two essential oils using liquid-...
Monday, November 3, 2014 at 2:31am

chemistry
Limone (MW 136g/mol) is a pleasant smelling liquid found in lemon and orange peels. The boiling point of limonene is 175 ˚C, but it co-distills with water at 97.5 ˚C. If the vapour pressure of water at 97.5˚C is 690 mmHg, what percent (by mass) of the steam-...
Monday, November 3, 2014 at 1:31am

chemistry
How many grams of CO2(g) are there in 81.0mL of the gas at 0.789atm and 30 ∘C?
Monday, November 3, 2014 at 12:11am

Chemistry
It takes 49.0J to raise the temperature of an 8.80g piece of unknown metal from 13.0∘C to 24.7∘C. What is the specific heat for the metal?
Monday, November 3, 2014 at 12:02am

CHEMISTRY
hOW TO PREPARE HCL SOLUTION OF 5-7 pH.
Sunday, November 2, 2014 at 11:59pm

Chemistry
How much energy (in kilojoules) is required to convert 130mL of diethyl ether at its boiling point from liquid to vapor if its density is 0.7138 g/mL?
Sunday, November 2, 2014 at 11:42pm

chemistry
Aniline (MW93 g/mol) co-distills with water 98.2 C. The vapor pressure of water at 98.2 C is 717 mmHg. You need to isolate 10 g of aniline. What is the minimum volume of water required to isolate 10 g of aniline in a steam distillation at 760 mmHg?
Sunday, November 2, 2014 at 10:37pm

Chemistry
A certain indicator, HA, has a Ka value of 6.3 × 10-8. The protonated form of the indicator is blue and the ionized form is red. -What is the PKa of the indicator? -What is the color of the indicator in a solution with pH=5?
Sunday, November 2, 2014 at 10:24pm

Chemistry
A generic solid, X, has a molar mass of 77.7 g/mol. In a constant-pressure calorimeter, 31.2 g of X is dissolved in 289 g of water at 23.00 °C. The temperature of the resulting solution rises to 24.40 °C. Assume the solution has the same specific heat as water, 4.184 J...
Sunday, November 2, 2014 at 9:52pm

chemistry
Calculate the potential of the following two half-cells that are connected by a salt bridge: a galvanic cell consisting of a standard hydrogen electrode on the left and a platinum electrode immersed in a solution that is 3.50 3 1023 M in TiO21, 0.07000 M in Ti31, and buffered ...
Sunday, November 2, 2014 at 9:37pm

chemistry
The reaction between sodium hydroxide and hydrobromic acid is represented in the equation below: OH- + H+ -> H2O A 62.5 mL sample of 1.86 M NaOH at 22.5 deg Celsius was mixed with 62.5 mL sample of 1.86 M of HBr at 22.5 deg Celsius in a coffee cup calorimeter. The ...
Sunday, November 2, 2014 at 9:13pm

Chemistry
If vinegar sample #1 requires 29.05 mL of NaOH solution to reach an endpoint, what volume should be required for samples #2 and #3?
Sunday, November 2, 2014 at 9:08pm

chemistry
Which of the following reactions have a positive ÄSrxn? Check all that apply. A(g) + B(g)--> C(g) 2A(g) + B(g)--> 4C(g) A(s) + B(g)--> 2C(g) 2A(g) + 2B(g)--> 3C(g)
Sunday, November 2, 2014 at 8:44pm

chemistry
Calculate the Calorimeter Constant (Ccal) if 25.00 g of water at 50.21°C was added to 25.00 g of water at 25.00 °C, resulting in an equilibrium temperature of 35.00 °C?
Sunday, November 2, 2014 at 8:32pm

Chemistry
Which of the following reactions have a positive ÄSrxn? Check all that apply. A(g) + B(g)--> C(g) 2A(g) + B(g)--> 4C(g) A(s) + B(g)--> 2C(g) 2A(g) + 2B(g)--> 3C(g)
Sunday, November 2, 2014 at 8:25pm

chemistry
Which of the following reactions have a positive ÄSrxn? Check all that apply. A(g) + B(g)--> C(g) 2A(g) + B(g)--> 4C(g) A(s) + B(g)--> 2C(g) 2A(g) + 2B(g)--> 3C(g)
Sunday, November 2, 2014 at 8:23pm

chemistry
determine the percent yield when 5.00g benzene burns in oxygen gas to form 1.50g of carbon dioxide and water vapor.
Sunday, November 2, 2014 at 7:41pm

chemistry - DrBob?
Hi! Can you tell me if I chose the right options for my chemistry homework? My answers are at the bottom. 1. Electrostatic interaction is important for which type of bond? A. ionic bond B. triple covalent bond C. single covalent bond D. double covalent bond 2. When an atom ...
Sunday, November 2, 2014 at 6:42pm

chemistry
calculate the volume of 0.0321M NaOH that will be required to neutralize 25.00 mL of a 0.0399M hydrochloric acid solution. M1v1=m2v2 since were trying to find out the volume I would change the equation to m2 times V2 divided by M1 0.0399 X 0.025/0.0321 =0.031L I don't know...
Sunday, November 2, 2014 at 6:06pm

chemistry - instrumentation
What can account for differences in the calculated value of a drug concentration in a sample as determined by standard curve method and response factor method?
Sunday, November 2, 2014 at 5:50pm

chemistry
Complete and balance the following reactions, where applicable. If no reaction occurs, write N.R. Li + H2O ----> KCI + F2 ---> Au + HNO3 ---> CI2 + NaF ----> Li + Fe(NO3)3 --->
Sunday, November 2, 2014 at 5:48pm

organic chemistry laboratory
hi, im not sure if all my answers are correct especially number 5. could any one check and tell me? please and thank you. 1. Why is it important to have clean test tubes before running a test? Before which tests should acetone not be used to clean the test tubes? Due to ...
Sunday, November 2, 2014 at 5:13pm

Chemistry
Hi! Can you tell me if I chose the right options for my chemistry homework? My answers are at the bottom. 1. Electrostatic interaction is important for which type of bond? A. ionic bond B. triple covalent bond C. single covalent bond D. double covalent bond 2. When an atom ...
Sunday, November 2, 2014 at 5:11pm

chemistry
find the temperature increase in C expected for 1.00 L of water when it absorbs all of the energy from the combustion of 1.00 g of acetylene, C2H2(g). (Every mole of acetylene releases 1300KJ of energy when combusted)
Sunday, November 2, 2014 at 4:53pm

chemistry
Nitrogen dioxide abstracts with water vapor to produce oxygen and ammonia gas. If 12.8 grams of nitrogen dioxide reacts with 5.00 liter of water vapor at 375 degrees celisus and 725 tore, how many grams of ammonia can be produced? Use an ice table.
Sunday, November 2, 2014 at 4:13pm

chemistry
The mole fraction of neon in the air is about .0000026. If the average molar mass of air is 28.96 g/mol, what is the concentration of neon in air in ppm? How do you set this up?
Sunday, November 2, 2014 at 4:11pm

College chemistry
How much heat is transferred when freezing 520 grams of water at 0 degrees Celsius?
Sunday, November 2, 2014 at 1:33pm

chemistry
At 23 oC the solubility of a gas sample is 0.05 g/L in water at 1.0 atm. What is the solubility when the pressure increases to 2.0 atm? I don't know what formula to use for this question.
Sunday, November 2, 2014 at 1:26pm

Chemistry
If ununseptium (element 117) reacts with oxygen what would be equation of the product? Thanks so much!
Sunday, November 2, 2014 at 1:06pm

Chemistry
Find the mass of each of the following: (a) 5.52 L O2 at 1.89 atm and 250.0 K (b) 3.43 L NH3 at 0.911 atm and 27°C (c) 117 mL SO2 at 0.823 atm and -53°C
Sunday, November 2, 2014 at 12:49pm

chemistry
What is the eq.wt of C7H6O3 and why ??😊
Sunday, November 2, 2014 at 12:48pm

Chemistry
A sample of oxygen that occupies 1.00 x 10^6 mL at 575 mm Hg is subjected to a pressure of 1.20 atm. What will the final volume of the sample be if the temperature is held constant?
Sunday, November 2, 2014 at 12:45pm

Chemistry
How do I find the number of energy levels in a positive and a negative ion? And also how do I find the number of electrons in a ion and a atom?
Sunday, November 2, 2014 at 12:39pm

chemistry
give the specific heat for aluminum is 0.900 J/g*c how much energy is required to raise 25.0 g of aluminum from 20.0 to 75.0
Sunday, November 2, 2014 at 11:36am

chemistry
lithium oxide is an effective absorber of carbon dioxide and can be used to purify air in confined areas such as space vehicles. what volume of carbon dioxide can be absorbed by 1.00 kg of lithium oxide at 25 degrees C and 1.00atm? Li2O(aq) +CO2(g) -> Li2Co3(s)
Sunday, November 2, 2014 at 10:07am

chemistry
how many milliliters of10.0m Hc(aq) are needed to prepare 890.0 ml of 1.00m Hcl(aq)
Sunday, November 2, 2014 at 10:06am

chemistry
Given the following reactions Fe2O3(s) + 3CO (s) → 2Fe (s) + 3CO2(g)ΔH =-28.0 kJ 3Fe (s) + 4CO2(s) → 4CO (g) +Fe3O4(s) ΔH = +12.5 kJ the enthalpy of the reaction of Fe2O3 with CO 3Fe2O3(s) + CO (g) → CO2(g) + 2Fe3O4(s) is __________ kJ
Sunday, November 2, 2014 at 9:37am

chemistry
The value of ΔH° for the reaction below is - 6535 kJ. __________ kJ of heat are released in the combustion of 16.0 g of C6H6(l)? 2C6H6(l) + 15O2(g) → 12CO2(g) + 6H2O (l)
Sunday, November 2, 2014 at 9:34am

chemistry
What is the eq.wt of C7H6O3 and why ??😊
Sunday, November 2, 2014 at 9:25am

Chemistry- Reacting Masses Calculations
Hi the question asks me to calculate the mass of calcium carbonate that must be decomposed to produce 14kg of calcium oxide. I think I've gone wrong somewhere, do you write 14000g or 14kg etc, could you help? I did: Moles CaO=(Mass CaO/Mr CaO) =1400/56 =25 CaO:CaCO3 1:1 25...
Sunday, November 2, 2014 at 6:38am

chemistry
If you dissolve 236.5 g of (NH4)3PO4 and 166.9 g of K3PO4 in enough water to make the volume of the solution 505.0 mL What is the molarity of ammonium ions and phosphate ions?
Sunday, November 2, 2014 at 12:49am

Clinical Chemistry
I am not sure how to start this. You are given a 200% solution of a compound. You must dilute and construct a calibration curve to interpret concentration of compound in unknown samples. Show the steps needed to perform a two-fold serial dilution through 5 tubes.
Sunday, November 2, 2014 at 12:47am

chemistry
The value of ΔH° for the reaction below is -1107 kJ: 2Ba (s) + O2(g) → 2BaO (s) How many kJ of heat are released when 5.75 g of Ba (s) reacts completely with oxygen to form BaO (s)?
Saturday, November 1, 2014 at 11:19pm

chemistry
magnesium metal (1.00 mol) and a volume of aqueous hydrochloric acid that contains .500 mol of HCL are combined and react to completion. how many liters of hydrogen gas, measured at STP, are produced? Mg(s) + 2HCL(aq) -> MgCl2(aq) + H2(g)
Saturday, November 1, 2014 at 10:29pm

Chemistry
If a calorimeter has a mass of 6.0 g, a specific heat of 2.0 J/(g*C), and it and its contents undergo a temperature increase of 5.5 *C, how much heat is gained by the calorimeter?
Saturday, November 1, 2014 at 9:19pm

chemistry
Ima Chemist found the density of Freon-11 (CFCl3) to be 5.58 g/L under her experimental conditions. Her measurements showed that the density of an unknown gas was 4.38 g/L under the same conditions. What is the molar mass of the unknown?
Saturday, November 1, 2014 at 9:13pm

chemistry
The antacid in question (with an active ingredient of Ca(HCO3)2), upon treatment with excess hydrochloric acid, a 0.413 g sample gives 92.85 mL of CO2 at 25.00oC and 1.000 atm. What percentage of the antacid is active ingredient? Assume a perfect system (i.e. the yield is 100%)
Saturday, November 1, 2014 at 5:36pm

chemistry
a 0.96 millimole sample of Na2CO3 gave 0.9 millimoles of CO2 gas. If a 0.376 g of pure Na2CO3 was reacted with excess acid, what volume of gas will be measured on this apparatus
Saturday, November 1, 2014 at 5:36pm

College Chemistry
Please tell me what I did wrong on this problem: Given the equation Fe2O3(s)+3CO(g)→2Fe(s)+3CO2(g), Calculate the number of grams of CO that can react with 0.370kg of Fe2O3 Here's what I did: .370kg x 1000 = 370g of Fe2O3 370g/[(55.85 x 2) + (13 x 3)] = 2.32 mol 2.32...
Saturday, November 1, 2014 at 5:04pm

Chemistry
A 0.2800 g sample of an unknown acid requires 28.22 mL of 0.1199 M NaOH for neutralization to a phenolphthalein point. a.) How many moles of OH- are used? b.) How many moles of H+ are found in the acid? c.) What is the calculated equivalent molar mass of the unknown acid? If I...
Saturday, November 1, 2014 at 3:28pm

chemistry
Complete the following reactions, where applicable. If no reaction occurs write N.R A) blank + blank ---> Cu(NO3)2 + PbSO4 B) C6H12O6 + O2 --> blank + blank C) AgNO3 + CuCI2 ---> blank + blank
Saturday, November 1, 2014 at 2:06pm

chemistry
convert the condensed formula to a complete and skeletal structure of the following formula (ch3)2chch2ch3
Saturday, November 1, 2014 at 12:34pm

Chemistry
A meteorological balloon contains 237. L of helium at 33. °C and 0.832 atm. If the volume of the balloon can vary according to external conditions, what volume would it occupy at an altitude at which the temperature is -57. °C and the pressure is 0.094 atm? (2 ...
Saturday, November 1, 2014 at 12:15pm

Chemistry
Suppose 55.3 L of a gas is at a temperature of -73. °C. If its temperature is increased to 411. °C, what will its volume be then?
Saturday, November 1, 2014 at 12:14pm

Chemistry
If you weighed out 0.38 grams of calcium and reacted it with excess amount of HCI how many miles of H2 grams would you expect to produce?
Saturday, November 1, 2014 at 8:13am

Chemistry
Calculate the solubility of Kcl2 in mole per dm cube of water at 90 dgree celcius if 10grams of the solute will saturate 20grams of water
Saturday, November 1, 2014 at 3:35am

Chemistry
What is the density, in grams per milliliter, of a salt solution if 210 mL has a mass of 234 g?
Friday, October 31, 2014 at 9:06pm

chemistry
What is the volume occupied by 0.252mol of helium gas at 1.35atm and 305K ?
Friday, October 31, 2014 at 7:28pm

chemistry
A bag of potato chips contains 575mL of air at 25.0∘C and a pressure of 765mmHg . Assuming the bag does not break, what will be its volume at the top of a mountain where the pressure is 458mmHg and the temperature is 10.0∘C?
Friday, October 31, 2014 at 7:00pm

chemistry
A balloon contains 0.126mol of gas and has a volume of 2.78L. If an additional 7.0×10−2mol of gas is added to the balloon, what will its final volume be?
Friday, October 31, 2014 at 6:13pm

chemistry
A 813. mL sample of argon gas at 452. K is cooled at constant pressure until the volume becomes 356. mL. What is the new gas temperature in Kelvin?
Friday, October 31, 2014 at 5:56pm

chemistry
Calculate the pressure, in atmospheres, of 0.0495 mol of a gas in a 0.379 L flask at 23. oC.
Friday, October 31, 2014 at 5:55pm

chemistry
A chamber has a volume of 17 m3 and operates at a pressure of 4.66 atm. What volume in cubic meters would the air in the chamber occupy if the pressure were changed to 1.64 atm at constant temperature?
Friday, October 31, 2014 at 5:18pm

chemistry
What is the mass of 5.33 mol Fe2(SO4)3? Answer in units of g
Friday, October 31, 2014 at 4:12pm

chemistry
How much does 1.9 mol of carbon dioxide weigh? Answer in units of g
Friday, October 31, 2014 at 4:11pm

chemistry
V1= 38.8 n1= 1.60*10^-3 V2= 49.9 n2= ? How do we solve for n2 using avogadro's law?
Friday, October 31, 2014 at 2:50pm

Chemistry
A 0.2800 g sample of an unknown acid requires 28.22 ml of 0.1199 M NaOH for neutralization to a phenolphthalein end point. a.) How many moles of OH- are used? b.) How many moles of H+ are found in the acid? c.) What is the calculated equivalent molar mass of the unknown acid? ...
Friday, October 31, 2014 at 1:43pm

Chemistry
Calculate the kinetic energy of the photoelectron emitted by a metal (threshold energy is 1.50 x 10^-19J) exposed to light of wavelength 5.00 x 10^-7 m (the energy beyond that required to knock electron goes into electron kinetic energy). A) -3/98 x 10^-19J B) 3.98 x 10^-19J C...
Friday, October 31, 2014 at 1:15pm

Chemistry
We have of ice at -11.9°C and it is ultimately completely converted to liquid at 9.9°C. For ice, use a specific heat (Cs) of 2.01 J/gK, for liquid water use a specific heat of 4.18 J/gK, and ΔHfusion = 6.01kJ/mole, Molar mass H20 = 18.01g/mol. If 1 mole of ice at...
Friday, October 31, 2014 at 1:12pm

chemistry
We have of ice at -11.9°C and it is ultimately completely converted to liquid at 9.9°C. For ice, use a specific heat (Cs) of 2.01 J/gK, for liquid water use a specific heat of 4.18 J/gK, and ΔHfusion = 6.01kJ/mole, Molar mass H20 = 18.01g/mol. If 4.19x10^3 kJ is ...
Friday, October 31, 2014 at 12:42pm

Organic Chemistry
1) Calculate the partition coefficient of caffeine in water/methylene chloride from the following data: 10.3 g/100 mL for methylene chloride and 2.04 g/100 mL for water. 2. A student is sure that 0.500 grams of caffeine is dissolved in 125 mL of water. The student extracts the...
Friday, October 31, 2014 at 2:24am

chemistry
How many moles of Ca(OH)2 are in 4.10 kg of Ca(OH)2? Answer in units of mol
Friday, October 31, 2014 at 1:38am

chemistry
How many molecules are in 105 g of sugar (C12H22O11)? Answer in units of molec
Friday, October 31, 2014 at 1:15am

Organic Chemistry
Calculate the partition coefficient of caffeine in water/methylene chloride from the following data: 10.3 g/100 mL for methylene chloride and 2.04 g/100 mL for water. Using the same data a student follows our procedure and extracts the caffeine using 3 extractions of 7 mL of ...
Friday, October 31, 2014 at 12:26am

Organic Chemistry
In a very controlled experiment, a student is sure that 0.500 grams of caffeine is dissolved in 125 mL of water. The student extracts the caffeine using a single extraction of 21 mL of methylene chloride. How much caffeine is in the methylene chloride? How much remains in the ...
Friday, October 31, 2014 at 12:25am

chemistry
advantage of potentiometric titration over other titrimetric titiration
Friday, October 31, 2014 at 12:14am

chemistry
Imagine that you have an ideal gas in a 8.00L container, and that 2850 molecules of this gas collide with a square-inch area of the container at any given instant. If the volume is increased to 56.0L at constant temperature, how many collisions will occur per square inch of ...
Thursday, October 30, 2014 at 11:25pm

Chemistry
2.562 g of H2C2O42H2O (s) was obtained and dissolved in enough DI water to form 150.0 mL of solution. What is the concentration of the resulting of H2C2O4 (aq) solution?
Thursday, October 30, 2014 at 9:29pm

Chemistry
In a constant-pressure calorimetry experiment, a reaction gives off 20.8 kJ of heat. The calorimeter contains 150 g of water, initially at 21.4 degrees Celsius. What is the final temperature of the water? The heat capacity of the calorimeter is negligibly small.
Thursday, October 30, 2014 at 8:59pm

Chemistry
What is the product of NaC2O4 and Ag+? A. NaC2O4 and Ag+ do not form a product. B. AgNaC2O4 C. Ag2C2O4****** I think the right answer is C...please let me know - I asked once earlier but no one answered - thought I would try again.
Thursday, October 30, 2014 at 7:57pm

Chemistry
A chemical formula shows the types and __blank__ of atoms in the smallest representative unit of a substance.
Thursday, October 30, 2014 at 7:19pm

Chemistry
Beryllium flouride's formula is BeF2. Why do beryllium and flourine combine in a 1:2 ratio?
Thursday, October 30, 2014 at 7:12pm

chemistry
2CH3OH(l)+3O2(g)→2CO2(g)+4H2O(g Part B Calculate the standard enthalpy change for the combustion of 1 mol of liquid methanol, assuming H2O(g) as a product. Part C Calculate the heat produced by combustion per liter of methanol. Methanol has a density of 0.791 g/mL. Part ...
Thursday, October 30, 2014 at 6:53pm

Chemistry urgent
2CH3OH(g)→2CH4(g)+O2(g)ΔH=+25​2.8kJ How many kilojoules of heat are released when 38.8g of CH4(g) reacts completely with O2(g) to form CH3OH(g) at constant pressure?
Thursday, October 30, 2014 at 6:51pm

chemistry
How many hydrogen atoms are in 833 grams of water? Answer in units of atoms
Thursday, October 30, 2014 at 6:30pm

Chemistry
How much heat is required to warm 1.60kg of sand from 22.0∘C to 100.0∘C? The heat capacity of sand is 0.84 J⋅g−1⋅K−1
Thursday, October 30, 2014 at 6:06pm

chemistry
Which of the following solutions of glucose (C6H12O6) is isotonic with a 0.15 M NaCl solution? Question 24 options: 0.15%(w/v) 0.55%(w/v) 1.5%(w/v) 5.4%(w/v)
Thursday, October 30, 2014 at 4:06pm

chemistry
Isotonic saline is 0.89% NaCl (w/v). Suppose you wanted to make 1.0 L of isotonic solution of NH4Cl. What mass of NH4Cl would you need? Question 23 options: 1.6 g 8.1 g 8.9 g 54 g
Thursday, October 30, 2014 at 4:04pm

chemistry
A solution is prepared by dissolving 104.1 grams of barium chloride, BaCl2 in 1000. grams of water? What is the boiling point of this solution? [The boiling point elevation constant for water is 0.52°C/mole solute in 1000g of water]
Thursday, October 30, 2014 at 4:03pm

Chemistry
The question has been answered years ago but not how it is solved. I tried the combined gas law. Here is the question: A balloon originally had a volume of 4.39 L at 44 degrees celsius and a pressure of 729 torr. The balloon must be cooled ??? to reduce its volume to 3.78 L at...
Thursday, October 30, 2014 at 3:58pm

Chemistry
what mass of nitrogen gas is required to react completely with 2.79 of hydrogen gas to produce ammonia?
Thursday, October 30, 2014 at 3:25pm

chemistry
Which of the following pairs of liquids are miscible in all proportions? Question 3 options: ethanol and oil ethanol and water gasoline and water All of the above
Thursday, October 30, 2014 at 3:17pm

chemistry
Which of the following is true regarding the solubility of gases in liquids? Question 4 options: Solubility decreases as temperature increases. Solubility increases as temperature increases. Solubility is unaffected by changes in temperature. None of the above
Thursday, October 30, 2014 at 3:16pm

chemistry
A 0.052g sample of aluminium reacts with excess 6M HCL. A 48.3mL volume of hydrogen gas was collected over water at 22C and the pressure of the hydrogen gas was 751mmHg.calculate the aluminum percent purity in the sample. What volume of hydrogen gas at STP is produced from the...
Thursday, October 30, 2014 at 2:46pm

CHEMISTRY
When 10.8 g of Silver was reacted with Sulfur, 12.4 grams of product was produced (there was only one product). What is the empirical formula of the product?
Thursday, October 30, 2014 at 10:48am

CHEMISTRY
pka of xanthine monophosphate is 5.5. a certain experiment can detect all forms of solute molecule present in solution at greater then 10% of total solute concentration. at pH 7, the experiment will detect presence of?
Thursday, October 30, 2014 at 10:36am

chemistry
A sample of neon gas at 1.20 atm compresses from 0.250 L to 0.125 L. If the temperature is held constant, what is the final pressure?
Thursday, October 30, 2014 at 10:30am

Chemistry
Solubility Rules!! Homework problem I desperately need help with Solutions used: 6M HCl, 6M NaOH, 6M NH3, 3M H2SO4 Mixed with: Cr(NO3)3, Fe(NO3)3, Bi(NO3)3, Mg(NO3)2, Pb(NO3)2 please help me and tell me which form precipitates and which
Thursday, October 30, 2014 at 9:09am

chemistry
What is the pH of a 100g/l solution of potassium cyanide?
Thursday, October 30, 2014 at 7:25am

chemistry
Relative abundance of H-2 (deuterium) is 0.015% and O-18 is 0.20%. Calculate the number of D2O18 molecules in a 1mol of natural water sample?
Thursday, October 30, 2014 at 4:58am

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