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February 13, 2016

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

chemistry
Calculate the value of the [Fe3+]/[Fe2+] if 3 cm3 of the 0.05 M Fe3+ solution is added to 25 cm3 of the 0.05 M Fe2+ solution
Wednesday, September 23, 2015 by ronika kumar

chemistry
How would you determine the polarity of the cell after each addition of Fe3+ solution
Wednesday, September 23, 2015 by ronika kumar

chemistry
Calculate the mass of salt needed to prepare 100 cm3 of 0.05 M solution of: (i) Fe(NH4)2(SO4)2.6H2O (ii) FeNH4(SO4)2.12H2O
Wednesday, September 23, 2015 by ronika kumar

chemistry
Calculate the mass of salt needed to prepare 100 cm3 of 0.05 M solution of: (i) Fe(NH4)2(SO4)2.6H2O
Wednesday, September 23, 2015 by ronika kumar

chemistry
CaO(s) reacts with SO2(g) according to the following equations: CaO9(s)+So2(g)--> CaSO3(g). A 8.85g mixture containing CaO(s) is placed in a 3.00-L container. The container is filled with SO2(g) to a pressure of 749 torr, at 20.0 degree Celsius. After the reaction has gone ...
Wednesday, September 23, 2015 by valentine

Chemistry
For the following chemical reaction, how many moles of lead(ii)iodide (PbI2) will be produced from 8 mol of potassium iodide (KI)?
Wednesday, September 23, 2015 by Cindy

chemistry/engineering
Wet sugar, containing one-fifth water by mass is conveyed through an evaporator in which 85.0% of the entering water is vaporized. Taking a Basis of 100 kg of feed to the evaporator A barrel of oil contains about 6 million Btu and about 1000 Btu is needed to evaporate one lbm ...
Tuesday, September 22, 2015 by katy

Gr 12 chemistry
Given the equation: 6C6H12O6+O2= 6CO2+ 6H2O How many moles of carbon dioxide will be formed upon the complete reaction of 24.1 grams of glucose with excess oxygen gas
Tuesday, September 22, 2015 by Avery

Chemistry
How can the concept of changing oxidation states of manganese be used in the real world
Tuesday, September 22, 2015 by Lema

Chemistry
Lets say you have 25 ml of a 3.25M copper(II) chlorate solution. How many moles of copper (II) chlorate would be in the solution and how many moles of the copper(II) ion would be in the solution?
Tuesday, September 22, 2015 by Heather

Chemistry
for each of the following acid-base reactions calculate the mass (in grams) of each acid necessary to completely react with and neutralize 4.85g of the base solution 1)2HNO3(aq)+ Ca(OH)2 (aq)> 2h20(l)+ Ca(NO3)2 2) H2SO4(aq)+ 2KOH(aq)---> 2H2O(l)+ K2SO4
Tuesday, September 22, 2015 by Mark

Gr 12 chemistry
Based on this reaction: H2(g) + I2(g)= 2HI(g) How many moles of iodine are necessary for form 0.530 moles of hydrogen iodine
Tuesday, September 22, 2015 by Avery

Chemistry
What happens when you mix ammonium chloride and sodium nitrate? I don't need any equations, just what would you see when you mix them together Thanks~
Tuesday, September 22, 2015 by Claire

AP chemistry
A certain complex of metal M is formulated as MCl3 ∙ 3 H2O . The coordination number of the complex is not known but is expected to be 4 or 6. (a) Would conductivity measurements provide information about the coordination number? (b) In using conductivity measurements to...
Tuesday, September 22, 2015 by stark11

our lady of fatima university Chemistry
What is the PH of the solution after 25.00 ml of 0.250 M KOH is added to 75.00 ml of 120 M Acetic acid?
Tuesday, September 22, 2015 by Chephira

Science Project suggestions??
I cannot think of an original science project idea. I would really like an original one instead of the online ones which have already have their own procedures and stuff. I would like to do a science project that is has to do with chemistry or computer science. Please help!
Tuesday, September 22, 2015 by Eunice

Chemistry
The number of calories needed to raise the temperature of 32 g of water from 12 Celsius and 54 Celsius is _____.
Tuesday, September 22, 2015 by Destany

chemistry
Consider the reaction: 2 NaBH4(aq) + H2SO4(aq) → 2 H2(g) + Na2SO4(aq) + B2H6(g) What volume, in mL, of a 0.500 M solution of NaBH4 is required to produce 0.529 g of B2H6? H2SO4 is present in excess.
Monday, September 21, 2015 by Bean

chemistry
Gaseous butane CH3CH22CH3 will react with gaseous oxygen O2 to produce gaseous carbon dioxide CO2 and gaseous water H2O . Suppose 36.0 g of butane is mixed with 41. g of oxygen. Calculate the minimum mass of butane that could be left over by the chemical reaction.
Monday, September 21, 2015 by Mike

Biology/ Chemistry
You want to prepare 0.5 L (500mL) of a 0.250M Na2SO4 solution. How many grams of do you need to measure out for the solution? [MW of Na2SO4 = 142 g
Monday, September 21, 2015 by Aileen

Chemistry
The densities of three solutions with known concentrations ( 20% , 50%, and 70%), and one unknown solution were determined. If the densities of 20%, 50% and 70% solutions are 0.69 and 0.58 and 0.49 g/mL, respectively, and the denisty of the unknown solution is 0.50 g/mL, what ...
Monday, September 21, 2015 by Marci

Chemistry
When one mole of C6H6 is burned, 3.27 MJ of heat is produced. When the heat from burning 7.47 g of C6H6 is added to 5.69 kg of water at 21.0°C, what is the final temperature of the water?
Monday, September 21, 2015 by Destany

Chemistry
Calculate the standard free energy of the following reactions at 25C, using standard free energies of formation. a. C2H4(g)  3O2(g) ±£ 2CO2(g)  2H2O(l) b. CaCO3(s)  2H(aq) ±£ Ca2(aq)  H2O(l)  CO2(g)
Monday, September 21, 2015 by nikk

Chemistry 2
Given the following information at 25C, calculate G at 25 degrees Celsius 2A(g)  B(g) ±£ 3C(g) Substance Hf  (kJ/mol) S(J/molK) A(g) 191 244 B(g) 70.8 300 C(g) -197 164 a. -956 kJ b. 956 kJ c. 346 kJ d. 346 kJ e. -1.03 * 10^...
Monday, September 21, 2015 by nikk

Chemistry
1.) It took Beethoven (the composer, not the dog from that movie) 4.5 years to compose the Ninth Symphony (this may not be true, I made it up). How many decades did it take him? 3.) Michael bought a pumpkin that had a mass of 18,165 grams. What was the mass of the pumpkin in ...
Monday, September 21, 2015 by Emily

Chemistry
A mixture of ethane and ethene occupied 35.5 L at 1.000 bar and 405 K. This mixture reacted completely with 110.3 g of O2 to produce CO2 and H2O. What was the composition of the original mixture? Assume ideal gas behavior
Monday, September 21, 2015 by Joseph

Chemistry
2H202-> 2H2O + O2 Suppose you carry out the decomposition using 25.0 mL of a 2.00M hydrogen peroxide solution and obtain the following: 8.62 mL of gas is collected in 120 seconds. How many moles of oxygen are produced per second?
Monday, September 21, 2015 by Jessica

science
chemistry Science.what can be deduced from the temperature change during the different reaction?
Monday, September 21, 2015 by ofentse

sofunda
science chemistry..investigate the reaction of a number of elements and compound with water and classify the reaction as exothermic or endothermic.
Monday, September 21, 2015 by ofentse

Chemistry
Part 1: Find the % by mass of each element in camphor (C10H20O). Step 1: Find the atomic mass of each element in the molecule. Atomic Mass of C: 12.0107 Atomic Mass of H: 1.00794 Atomic Mass of O: 15.9994 Step 2: Find the mass combination of each element. Carbon: 10 atoms 10...
Monday, September 21, 2015 by Chelsea

chemistry HELP!!
Reaction Rate = -(1/2) [d(H2O2)/dt] = [d(O2)/ dt] Using 25 mL of a 0.2 M hydrogen peroxide solution, the following results are obtained from the equation above: 8.62 mL of gas is collected in 120 seconds. (Assume 760 Torr = 1 atm) Room temperature is 25 degrees C and the vapor...
Monday, September 21, 2015 by Aaron

chemistry
How many liters of hydrogen gas are produced during an enthalpy change of -50kJ, assuming STP conditions? 1L= 1kg zn+ hno3 yields znn03 + 1/2 h2 +100kJ -50 kj x (1mol h2/ 100kj) X (2.02g / 1 mol) h2 ) = 1.01 g please help tried to get the answer but it it supposed to be 11.02 ...
Monday, September 21, 2015 by mariam

Chemistry
How many moles of sodium ions are present in a 50.0 g sample of NaCl? Do I use avagadros number?
Sunday, September 20, 2015 by EV

Chemistry
Imagine that you have a stock solution with a concentration of 4.6 M glucose (C1). You want to use the stock solution to prepare a diluted solution of 0.22M glucose (C2). You need a total volume of 10mL of 0.22M glucose (V2). What volume of water you need to use for making 0....
Sunday, September 20, 2015 by Marco

AP Chemistry
An unknown amount of water is mixed with 350 mL of a 6 M solution of NaOH solution. A 75 mL sample of the resulting solution is titrated to neutrality with 52.5 mL of 6 M HCl. Calculate the concentration of the diluted NaOH solution. Answer in units of M I didn't know what...
Sunday, September 20, 2015 by Anonymous

organic chemistry
1. Predict the order of elution of a mixture of triphenylmethanol, biphenyl, benzoic acid, and methyl benzoate from an alumina column. You may need to examine the structural elements in each compound. 2. Once the chromatography column has been prepared, why is it important to ...
Sunday, September 20, 2015 by DONT UNDERSTAND!!

CHEMISTRY
It keeps saying I am wrong! Am I doing the math incorrectly? Problem: Calculate the amount of energy released in kJ/mol for the fusion reaction of two 1H atoms to yield a 2H atom and electron: 1/1H+1/1H→2/1H+0/1e The atomic masses are 0/1e (0.0005486 u), 1H (1.00783 u), ...
Sunday, September 20, 2015 by Rach

Chemistry
Technetium-99m, an important radionuclide in medicine, has a half-life of 6.0 hours. What percentage of a sample of technetium-99m will remain undecayed after the following times? 18.0 hours 1 day 5 half- lives
Sunday, September 20, 2015 by Anonymous

Chemistry
average atomic mass of isotopes
Sunday, September 20, 2015 by Lisa

Chemistry ! Need help.
A buffer prepared by dissolving oxalic acid dihydrate (H2C2O4·2H2O) and disodium oxalate (Na2C2O4) in 1.00 L of water has a pH of 5.007. How many grams of oxalic acid dihydrate (MW = 126.07 g/mol) and disodium oxalate (MW = 133.99 g/mol) were required to prepare this ...
Sunday, September 20, 2015 by Owen

AP Chemistry
Hey guys! What is the rate constant is particularly sensitive to: 1 A change in volume 2 A change in pressure 3 A change in product concentration 4 A change in reactant concentration 5 A change in the activation energy I feel like it is a change in the activation energy b/c ...
Sunday, September 20, 2015 by Allie

Chemistry
A 0.020 M KMnO4 solution was used to determine the percent iron in a sample containing iron(II). MnO− 4 + 5 Fe2+ + 8 H+ → Mn+2 + 5 Fe3+ + 4 H2O It took 25.0 mL of the KMnO4 to completely react with all the iron(II) in the 0.500 g sample. What was the percent iron(...
Sunday, September 20, 2015 by Child

chemistry
Combustion analysis of 1.0g of a compound containing carbon , hydrogen and oxygen gives 2.3 g of carbon dioxide and 0.93g of water . If The relative molecular mass is 58. Calculate The empirical and molecular formula
Sunday, September 20, 2015 by hiedi

Chemistry
A 39 g of iron ore is treated as follows. The iron in the sample is all converted by a series of chemical reactions to Fe2O3. The mass of Fe2O3 is measured to be 7.9 grams. What was the percent iron in the sample of ore? Answer in units of %. Please help me understand how to ...
Sunday, September 20, 2015 by Alex

chemistry
what is the percent yield of reaction in which 455g of tungsten (VI) oxide (WO3) reacts with excess hydrogen gas to produce metallic tungsten and 9.60 cm^3 of water.(density of water = 1.00 g/cm^3) ???
Sunday, September 20, 2015 by chancy xdicey

chemistry
How is phenol converted into salicylic acid. Give chemical equation?
Sunday, September 20, 2015 by wungmung

Chemistry help
How many moles of Fe3O4 are required to supply enough iron to prepare 0.752 mol Fe2O3?
Sunday, September 20, 2015 by Tina

Chemistry problem
How many moles of UF6 would have to be decomposed to provide enough fluorine to prepare 2.14 mol of CF4? I'm not sure how to solve this problem? So far all I did is calculate the moles of F in CF4, which is 8.56 moles
Sunday, September 20, 2015 by Tina

Chemistry
Lead has a density of 11 g/ml. Mercury has a density of 13.6 g/ml. How much more volume would 1 pound of lead occupy the one pound of mercury?
Saturday, September 19, 2015 by Katie

Chemistry Help!
When C2H4O2 burns in oxygen, the products are carbon dioxide and water. How many grams of water are obtained from burning 4.76 g of this substance? How would I solve this problem?
Saturday, September 19, 2015 by wdym

Chemistry
I am really lost with this. Calculate the amount of energy released in kJ/mol for the fusion reaction of two 1H atoms to yield a 2H atom and electron: 1/1H+1/1H→2/1H+0/1e The atomic masses are 0/1e (0.0005486 u), 1H (1.00783 u), 2H (2.01410 u), and 3He (3.01603 u). I ...
Saturday, September 19, 2015 by Bob

chemistry
I wonder how to calculate the Kp if the question gives us the total pressure and no of mol of reactant. Without giving the mol of product how can i calculate the Kp. Can anybody help me what to do to calculate the Kp. Here is the question im unable to answer. Mol of CO and Cl ...
Saturday, September 19, 2015 by elly

Chemistry
Calculate the amount of heat required to raise the temperature of a 65-g sample of water from 32∘C to 65∘C. (The specific heat capacity of copper is 4.184 J/g∘C.) Express your answer in Joules.
Saturday, September 19, 2015 by Rachel

AP Chemistry
Hey guys! I'm really lost on this equation. Any help? H2(g) yIelds 2H(g)   Delta  H = 436 kJ/mol F2(g) yields  2F(g)   ​;          DeltaH = 158 kJ/mol H(g)  + F(g) yields HF(g) &...
Saturday, September 19, 2015 by Allie

CHEMISTRY !!! HELP !
A solution containing 0.0158 M maleic acid and 0.0226 M disodium maleate. The Ka values for maleic acid are 1.20 × 10-2 (Ka1) and 5.37 × 10-7 (Ka2). What is the pH of the solution ?
Saturday, September 19, 2015 by Alex

chemistry(ch1001)
When 6.853 mg of sex hormone was burned in a combustion analysis,19.73 mg of CO2 and 6.391 mg of H2O were obtained. What is the empirical formula of the compound ?? Please be detailed...help me.
Saturday, September 19, 2015 by chancy xdicey

chemistry
Bromine gas is allowed to reach equilibrium according to the equation. Br2=2Br Kc=0.0011 at 1280°C Initial concentration of br2 is 0.063M and Br is 0.012M. How to calculate the concentration of these species at equilibrium. Please help me .
Saturday, September 19, 2015 by han

Chemistry
C. Consider the reaction 2C3H6 + 9O2 6CO2 + 6H2O. If the rate at which C3H6 is reacting is 0.40 mol liter−1s−1, then the rate at which 1. O2 is reacting is 1.6 mol liter−1s−1 2. CO2 is being formed is 0.40 mol liter−1s−1 3. H2O is being ...
Saturday, September 19, 2015 by Jim

chemistry
Name and draw the molecular structure of this compound CH3CH(C2H5)CH(CH3)CH(C3H7)CH2CH3
Saturday, September 19, 2015 by dan

Chemistry 101
I have been attempting this problem so many times. I dont know if I am plugging in the numbers correctly but I cannot seem to get the answer correct. Please help! A patient arrives in the emergency room with a burn caused by steam. Calculate the heat, in kilocalories, that is ...
Saturday, September 19, 2015 by Sabrina

Chemistry
A solution containing 0.0158 M maleic acid and 0.0226 M disodium maleate. The Ka values for maleic acid are 1.20 × 10-2 (Ka1) and 5.37 × 10-7 (Ka2). What is the pH of the solution ?
Saturday, September 19, 2015 by Alex

chemistry
How much heat (in kJ) is required to warm 13.0 g of ice, initially at -13.0 ∘C, to steam at 111.0 ∘C? The heat capacity of ice is 2.09 J/g⋅∘C and that of steam is 2.01 J/g⋅∘C.
Saturday, September 19, 2015 by Alexus

Chemistry
i have to round each to 3 significant figures, then to one significant figure, in standard form, how? a) 87.073 m b) 4.3621 x 10^8 m c) 0.01552 m d) 9009 m e) 1.7777 x 10^-3 m f)629.55 m
Friday, September 18, 2015 by sheryl

chemistry
atmospheric temperature changes the state of these things, but i do not know to what? diamond, mercury, oxygen, clay, neon, and cooking oil?
Friday, September 18, 2015 by anon

Chemistry
Magnesium oxide can be made by heating magnesium metal in the presence of the oxygen. The balanced equation for the reaction is 2Mg(s)+O2(g)¨2MgO(s) When 10.2 g Mg is allowed to react with 10.6 g O2, 11.8 g MgO is collected. Determine the theoretical yield for the ...
Friday, September 18, 2015 by Keishaun

Chemistry
It says to convert 19.3 Inches to Centimeters. How do I figure this out? I know 1 Inch = 2.54 Centimeters.. The answer is 49.02 because I did online conversions but how do I arrive to my answer? What do you do?
Friday, September 18, 2015 by Jake

Chemistry
what is the following's states at atmospheric temperature? 1. diamond 2. mercury 3. oxygen 4. clay 5 cooking oil 6. neon
Friday, September 18, 2015 by john

Chemistry
Katie measures the mass of a chunk of gold to be 9.67 g. The accepted mass of the gold chunk is 9.82 g. How would I calculate the percent error and report my answer to two significant figures?
Friday, September 18, 2015 by Jake

Chemistry
if a cooler has 63 kg of ice how much energy is required to melt it at 0 degrees celcius? The heat fusion for water is 80 cal/gram
Friday, September 18, 2015 by Ali

Chemistry
If 2.0 mol of propane are burned (reacted with oxygen), how many moles of carbon dioxide will be produced? C3H8 (g) + 5 O2(g) → 3 CO2 (g) + 4 H2O (g) I just want to make sure the answer is 6 mol of CO2 will be produced.
Friday, September 18, 2015 by Ashley

chemistry
would NBr3O be polar or nonpolar?
Friday, September 18, 2015 by paul

Chemistry
Prepare 45.00ml of 0.125M gold III chloride solution, given 500.00ml of a 0.500M gold III chloride solution. Explain how you will prepare the solution
Friday, September 18, 2015 by Anonymous

Chemistry
A piece of copper metal (specific heat 0.385 J/g∘C) at 85.6 ∘C is placed in 50.0 g of water at 16.2 ∘C. The metal and water come to the same temperature of 23.6 ∘C. What is the mass?
Thursday, September 17, 2015 by Hi

chemistry polarity
would one consider the molecule NBr3O to be nonpolar or polar? I feel like all of the dipole moments will cancel, when you draw the VSPER structure the Br atom in the plane and out of the plane cancel, however O going up and the Br coming out of the plane, ...I feel like the ...
Thursday, September 17, 2015 by paul

chemistry vsper/lewis polarity
would one consider the molecule NBr3O to be nonpolar or polar? I feel like all of the dipole moments will cancel, when you draw the VSPER structure the Br atom in the plane and out of the plane cancel, however O going up and the Br coming out of the plane, ...I feel like the ...
Thursday, September 17, 2015 by paul

Chemistry
Explain the laboratory preparation of one Litre of 1.3M formic acid buffer of pH 3.9 from solid sodium formate (molecular weight =68) and formic acid liquid 30% pure (Density of formic acid = 1.029g/ml, pKa = 3.75)
Thursday, September 17, 2015 by Christy

Organic Chemistry
Assume 1 g of the 3 g is aspirin. Show by calculation that 7 mL of 6 M HCl is enough to completely neutralize the conjugate base of aspirin to the neutral compound.
Thursday, September 17, 2015 by KM2017

Chemistry
Round to the correct number of significant figures. 1) 6.02/2.23 2.70 2) 18.42/2.34 7.87 3) 35.15/3.10 11.3
Thursday, September 17, 2015 by Anonymous

Chemistry
Use the measurements to calculate the volume and round to the correct number of significant figures. 1. .0003303 m 2. 2.0 m 3. 10 m 10*2.0*.0003303 = .006606 Should this be rounded as .007m?
Thursday, September 17, 2015 by Anonymous

Chemistry
I keep getting the wrong answer? I know there is one similar to this on here but I keep getting the wrong answer. The gold foil Rutherford used in his scattering experiment had a thickness of approximately 6×10^−3mm. If a single gold atom has a diameter of 2.9&...
Wednesday, September 16, 2015 by Rach

Chemistry
Calculate the percentage by mass of the active ingredient in an antacid tablet that weighs 1.36 g if it contains 520 mg of calcium carbonate
Wednesday, September 16, 2015 by Anonymous

chemistry
Gaseous butane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water . Suppose 29.1 g of butane is mixed with 64. g of oxygen. Calculate the minimum mass of butane that could be left over by the chemical reaction. Be sure your answer has the ...
Wednesday, September 16, 2015 by lauren

Chemistry
Calculate the number of moles of carbon atoms present in 1.1 g of ethanol (C2H6O). Answer in units of mol.
Wednesday, September 16, 2015 by Nicole

Chemistry
How many atoms of mercury are present in 3.2 cubic centimeters of liquid mercury? The density of mercury is 13.55 g/cc. Answer in units of atoms.
Wednesday, September 16, 2015 by Nicole

Chemistry
An analysis of nicotine (MW = 162 g/mol) gives 74.0% carbon, 8.65% hydrogen, and 17.3% nitrogen. What is the TRUE (MOLECULAR) formula for nicotine? All I need are the formulas!!
Wednesday, September 16, 2015 by Nicole

chemistry
A sample of a copper chloride of mass 1.425g is treated with a water solution of silver nitrate, and the AgCl formed had a mass of 3.038g. What is the correct empirical formula of the copper chloride?
Wednesday, September 16, 2015 by melissa

Chemistry
A 50g chuck of metal (c=0.506 j/g degrees celsius) is heated to 60 degrees celsius. It is then dropped into a calorimeter (c=1.40 j/g derees celsius, m - 5.0g) that contains 100g of liquid. The temperature of the liquid raises from 15 degrees celsius to 20 degrees celsius. ...
Wednesday, September 16, 2015 by Renae

Chemistry
A 50g vhuck of metal (c=0.506 j/g degrees celsius) is heated to 60 degrees celsius. It is then dropped into a calorimeter (c=1.40 j/g derees celsius, m - 5.0g) that contains 100g of liquid. The temperature of the liquid raises from 15 degrees celsius to 20 degrees celsius. ...
Wednesday, September 16, 2015 by Renae

Chemistry
a 250.0g mass of metal at 112.4 degrees celcius is dropped in a calorimeter (c=1.40j/g degrees celsius, m = 5.0g) containing 150.0g of water. The water and calorimeter are initially at 25.0 degrees celsius. At the end of the experiment, the temperature of the water, ...
Wednesday, September 16, 2015 by Renae

chemistry
Oganic solvents are not suited to be heated with one of the followings: Oil Bath Electric hot plate Water bath Bunsen burner flame 2 Which of the following is not an inflammable liquid ? Water Ethanol Kerosine Benzene 3 These are some safety precausions necessary in a ...
Wednesday, September 16, 2015 by onyi

chemistry
1 In the reaction of potassium permanganate and iron salt in acidic medium, how many moles of manganese reacted with iron? 2 moles of Mn with 1 mole of Fe 1 mole of Mn with 5 moles of Fe 1 mole of Mn reacts with 1 mole of Fe 5 moles of Mn reacts with 1 mole 2 Which of the ...
Wednesday, September 16, 2015 by onyi

chemistry
When chemicals pour on the skin, the laboratory first aid is to ---------------. Apply 1% sodium carbonate Apply 1% boric acid solution Flush the eye with a copious amount of clean lukewarm running water Wash with soap and warm water 2 For cut sustained in the laboratory ...
Wednesday, September 16, 2015 by onyi

Chemistry college
You are given a recipe for a buffer that contains 5% (w/v) MgSO4.7H2O. However, you only have MgSO4 anhydrous available to you. How much MgSO4 anhydrous do you need to make 0.5L of the buffer with the same molar concentration as in the recipe? Show your calculations
Wednesday, September 16, 2015 by Anna

chemistry
science
Wednesday, September 16, 2015 by ritik

Chemistry
Which of the following shows the correct dissolution reaction for BaCl2?
Wednesday, September 16, 2015 by Morgan

Chemistry
What is the concentration (M) of K+ in a solution made by mixing 25.0 mL of 0.100 M KCl with 50.0 mL of 0.0500 M KCl? Can you please explain how to solve this problem. I thought to do 25*.1+50*.05=5 But that seems wrong. What should I try to do?
Wednesday, September 16, 2015 by URGENT

chemistry
1.2x10 to the 9th power gallons of water per day converted to gallons per second
Tuesday, September 15, 2015 by Art

chemistry
a flask is charged with 2.00 atm of nitrogen dioxide and 1.00 atm of dinitrogen tetroxide at 25 degrees celsius and allowed to reach equilibrium.when equilibrium is established, the partial pressure of NO2 has decreased by 1.24 atm. (a) what are the partial pressures of NO2 ...
Tuesday, September 15, 2015 by Aisk

CHEMISTRY
If a solution is made by dissolving 15g of each solid in the same 100g of water at 70 degrees and the solution is cooled to 20 degrees, crystals are observed.. Which solid crystallises and explain in reference to both solids
Tuesday, September 15, 2015 by Gabrielle M

chemistry
a certain hydrocarbon has the analysis C=85.84% and H=14.16%. the density of its vapour is 2.50g/L at STP. find the empirical and molecular formula.
Tuesday, September 15, 2015 by trinaa

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Homework Help: Science