Wednesday
September 28, 2016

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

Chemistry
Question Part Points Submissions Used It has been determined that the body can generate 5500 kJ of energy during one hour of strenuous exercise. Perspiration is the body's mechanism for eliminating this heat. How many liters of water would have to be evaporated through ...
Wednesday, April 13, 2016 by Tom

Chemistry
Describe how to make 100 mL of a 0.120 M solution of CU(NO3)2 * 3H20 (Making a solution lab)
Wednesday, April 13, 2016 by Roygbiv

Chemistry
For the reaction: 2NO(g) + H2(g) <=> N2O(g) + H2O(g) + energy Write the equilibrium constant expression for the reaction. I wrote: [N2O][H2O] / [NO]2 [H2] This reaction takes place at 25°C. At this temperature the concentration of NO is found to be 1.75 mol/L, the ...
Wednesday, April 13, 2016 by Kat

chemistry
how many protons and electrons are in 7.4 grams of hydrogen?
Wednesday, April 13, 2016 by joe

Chemistry
If you have Mg+2HCL=MgCl2+H2 and a temp of 295K, and barometric pressure of .976atm and 43.5 mL of gas was collected from the experiment, then how many moles of H2 do you have? My answer is PV=nRT so n=PV/RT Plug in the numbers and get .00175 moles, but I think that's ...
Wednesday, April 13, 2016 by Kiana (Check My Answer Only)

Chemistry
A sample of g 0.2050 oxalic acid (4.2 H2C2O H2O) required 25.52 mL of KOH solution to complete the neutralization according to rea tion: HOOCCOOH + 2 KOH + KOOCCOOK ↔ H2O Which the concentration in mol L-1 of this KOH solution? A sample of an unknown oxalate 0.3025 g ...
Wednesday, April 13, 2016 by Michaela

Chemistry
On Mars, the gravitational acceleration (g) is equal to 3.7 m/s2. Imagine the experiment from our lab performed on Mars, using a distance of 68 m from the catapult to the bucket. What velocity would you need to launch the ball into the bucket?
Wednesday, April 13, 2016 by Denise

Chemistry
Which reagent has been oxidized in the following equation ? H2(g) + N2(g) === NH3(g)
Wednesday, April 13, 2016 by Feng

chemistry
1-What are the characteristics of the benzene molecule and those of the obtained product(1,2,3,4,5,6-hexachlorocyclo hexane). 2-The volume of used chlorine Cl when added to benzene is 240cm^3. What minimal volume of benzene is needed so that all of chlorine reacts? benzene ...
Wednesday, April 13, 2016 by angy

Chemistry
Sarah is ordering cheese pizza for a party of 10 people. She knows that each pizza has 8 slices. To figure out how many pizzas to order, Sarah needs to know the
Wednesday, April 13, 2016 by Katlen

chemistry
1-What are the characteristics of the benzene molecule and those of the obtained product(1,2,3,4,5,6-hexachlorocyclo hexane). 2-The volume of used chlorine Cl when added to benzene is 240cm^3. What minimal volume of benzene is needed so that all of chlorine reacts? benzene ...
Wednesday, April 13, 2016 by angy

Fundamental Chemistry
Given the balanced reaction below; write out the balanced ionic equation and the balanced net ionic equation. Include phase labels and charges where appropriate. Cu(s) + Zn(NO3)2 (aq) → Cu(NO3)2 (aq) + Zn(s)
Wednesday, April 13, 2016 by Dana

chemistry
calculate the lowest frequency of UV. light which has enough energy to break a Cl-Cl bond. ( bond energy =243kj/mol). I got 7.89E14 but the answer is 6.14E14s–¹. how?
Wednesday, April 13, 2016 by jay

Chemistry
how would you prepare pure dry crystals of potassium trioxonitrate?
Wednesday, April 13, 2016 by Alexa

chemistry
From the enthalpies of reaction 2C(s)+O2(g)¨2CO(g)ƒ¢​H=−221.0kJ 2C(s)+O2(g)+4H2(g)¨2CH3OH(g)&#​131;¢H=−402.4kJ calculate ƒ¢H for the reaction CO(g)+2H2(g)¨CH3OH(g)
Tuesday, April 12, 2016 by ryno

chemistry
if 62.3 g of zinc react with hydrophosphoric acid (H3PO4) it produces zinc (I) phosphate and hydrogen. how much zinc (I) phosphate is produced?
Tuesday, April 12, 2016 by kim

Chemistry
Consider the following acid/base reaction CO3^2− + 2H^+ → H2O + CO2 that produces CO2 gas. 6 L of CO2 is collected at STP. What is the molarity of the HCl solution used in the reaction if 81 mL of HCl was needed?
Tuesday, April 12, 2016 by Claire

Chemistry
How do I calculate the heat released by 1 mole MgO Given: 0.5 g of MgO Heat gained by acid is 1337.6 kJ I calculated the moles for MgO which I got 0.0125 I'm not sure if I'm on the right track..
Tuesday, April 12, 2016 by Rose

Chemistry
You have a vinegar solution you believe to be 0.53 M. You are going to titrate 20.72 mL of it with a NaOH solution that you know to be 0.974 M. At what volume of added NaOH solution would you expect to see an end point?
Tuesday, April 12, 2016 by Claire

Chemistry
A 21.7 mL sample of 0.18 M KOH solution required 26.3 mL of aqueous acetic acid solu- tion in a titration experiment. Calculate the molarity of the acetic acid solution.
Tuesday, April 12, 2016 by Emma

Chemistry
The chemistry problem is "How would you make 500.0 mL of a 3.00 M HCl solution form a stock solution that is 6.00 M?" I have no clue how to even approach this problem.
Tuesday, April 12, 2016 by Nate

chemistry
Liquid methanol (CH 3 OH) is used as an alternative fuel in truck engines. When a 0.150 g sample of methanol was burned in a calorimeter, open to the atmosphere, the temperature increased 1.52 ºC. The heat capacity of the calorimeter was 1.97 kJ / ºC. The products of...
Tuesday, April 12, 2016 by jaspreet

chemistry
A sample of silicon absorbs 14.9 J of heat, upon which the temperature of the sample increases from 21.5°C to 28.5°C. If the specific heat of silicon is 0.710 J g -1 K -1 , what is the mass (in grams) of the sample?
Tuesday, April 12, 2016 by jaspreet

Chemistry 2
Potassium nitrate has a lattice energy of -163.8 kcal/mol and a heat of hydration of -155.5 kcal/mol. How much potassium nitrate has to dissolve in water to absorb 107 kJ of heat?
Tuesday, April 12, 2016 by kread561

Chemistry
What volume of a 5.0% (v/v) Acetic Acid solution will contain 40.mL of Acetic Acid?
Tuesday, April 12, 2016 by Michaela

chemistry
calculate the PH at the 60ml of .200M aniline (kb=3.2x10^-6) with .200M HNO3 solution before acid is added after 0,19,70 ml of HNO3
Tuesday, April 12, 2016 by Jade

Chemistry
Calculate the pH of 0.250 L of a 0.65 M formic acid (HCO2H) - 0.10 M sodium formate (HCO2Na) buffer before (on your own) and after the addition of (a) 0.010 mol of NaOH (on your own) and (b) 0.010 mol of HCl (in the blank). Assume that the volume remains constant. I need help.
Tuesday, April 12, 2016 by Tyler

Chemistry
What is the pH of a 0.052 Mole solution of HCl?
Tuesday, April 12, 2016 by Lucy

Chemistry
When titrating 50.0 mL of 0.10 M H2SO4 with 0.10 M NaOH, how many mL of NaOH will you have added to reach the 1st equivalence point? I am confused... What H2A problem? Chemistry-Dr.Bob222 - DrBob222, Tuesday, April 12, 2016 at 1:49am Refer to the H2A problem above BUT you only...
Tuesday, April 12, 2016 by Nevaeh

Chemistry
A student completes a titration of an unknown diprotic acid. In this experiment, 0.79 g of the acid is dissolved in 250.0 mL of water. It requires 13.48 mL of 1.0 M NaOH to reach the second equivalence point. What is the molar mass of the acid?
Tuesday, April 12, 2016 by Nevaeh

Chemistry
What is the delta G naught for the cell in question 1 at 298 K? Question 1: Which is spontaneous, the oxidation of copper to Cu2+ or the reduction of Cu2+ to Cu? Work: OX: Cu --> Cu2+ + 2e- RE: 2e- + Cu2+ --> Cu Overall: Cu + Cu2+ --> Cu + Cu2+ Delta G knaught = -RTln...
Tuesday, April 12, 2016 by Kait

Chemistry
A 40.0 g sample of zinc is allowed to react with excess hydrochloric acid. How many liters of dry hydrogen gas are produced if the gas is collected over water at 23.0 degrees celsius and 1.234 atm of pressure? (Vapor pressure of water at 23.0 degrees celsius is 21.0 mmHg) ...
Tuesday, April 12, 2016 by Me

Chemistry
If 100ml of 1M NaOH solution is added to water make a solution of 1.5L, calculate its normality
Tuesday, April 12, 2016 by Avinash

Chemistry
Calculate the number of moles Fe2O3 in 2.37x10^21 atoms of Fe2O3?
Tuesday, April 12, 2016 by Josh

chemistry
Calculate the concentrations of all species present in a 0.100 M solution of weak polyprotic acid H3PO4. Ka1=7.5 x 10 ^-3, ka2 = 6.2 x 10 ^-8, Ka3= 3.6 x 10^-13 How the heck do I do this
Tuesday, April 12, 2016 by Kate

Chemistry
Mark all statements that are true....numbers 1⎕ Molecular solids are not crystalline. 2⎕ Molecular solids can be held together by ALL TYPES of intermolecular forces 3⎕ Molecular solids are ONLY EVER composed of molecules. 4⎕ Ionic solids are NOT ...
Monday, April 11, 2016 by Brandt

Chemistry-Dr.Bob222
A student completes a titration of an unknown diprotic acid. In this experiment, 0.79 g of the acid is dissolved in 250.0 mL of water. It requires 13.48 mL of 1.0 M NaOH to reach the second equivalence point. What is the molar mass of the acid?
Monday, April 11, 2016 by Nevaeh

Chemistry-Dr.Bob222
When titrating 50.0 mL of 0.10 M H2SO4 with 0.10 M NaOH, how many mL of NaOH will you have added to reach the 1st equivalence point?
Monday, April 11, 2016 by Nevaeh

Chemistry
At STP potassium chlorate (KClO3) decomposes to produce solid potassium chloride (KCL) and oxygen gas (O2) according to the balanced chemical equation: 2KClO3(s)->2KCl(s)+3O2(g) What volume of oxygen gas, measured at 40 degrees celsius and 85.4 kPa, will be produced when 13...
Monday, April 11, 2016 by Abby

Chemistry
You have a tank of wine that needs a 20 ppm addition of SO2. Answer the following questions. 1. To make 5 gallons of a 6% w/v SO2 solution (expressed as SO2) how much K2S2O5 (222 g/mol) should be weighed out? 2. How much of this solution (in mLs) should be added to the tank (...
Monday, April 11, 2016 by Sasha

chemistry
what is the molarity of an unknown acid if 40.5 ml. of the acid can be titrated to an end point by 20.5 mL. of 0.2250 M NaOH
Monday, April 11, 2016 by linda

Chemistry
NO2 +H2O --> HNO3 + NO 3*NO2 +H2O --> 2*HNO3 + NO Properly balanced right?
Monday, April 11, 2016 by Brandt

Chemistry
Can you please check my answer? Balance the following equation: Cl2 + KI --> I2 + KCl How many grams of Cl2 are used to form 6.8 g of KCl? So 6.8 grams of KCl divided by 74.55g Kcl x 1molCl2 divided by 2mol KCl multiplied by 70.91 g Cl2/mol.... 3.2 grams of Cl2
Monday, April 11, 2016 by Brandt

Chemistry- Dr.Bob222
What is the pH of a solution that is 0.150 M in acetic solution and 0.300 M in sodium acetate? The Ka of acetic acid is 1.8 x 10^-5. My work: pH= pKa + log (base/acid) pH= -log (1.8 x 10^-5) + log (0.300/0.150) pH=5
Monday, April 11, 2016 by Nevaeh

Chemistry
if a sample of gas has a volume of 8.88 ml at -12.0 C and .975 atm. what volume would this sample have at STP?
Monday, April 11, 2016 by Ash

chemistry
Would it be possible to make polymers out of amino acids? Why or why not? Polypeptides are very important biological compounds, also know as proteins. How are polypeptides similar in structure to polyamides or polyesters?
Monday, April 11, 2016 by Anonymous

Chemistry
How do you find the mass of iron in audio tapes per metre of tape?
Monday, April 11, 2016 by Jenna

Chemistry
Explain why the solubility of PbF2 is pH dependent, but the solubility of PbCl2 is not. I know the solubility of PbF2 is pH dependent because the solubility would increase as the solution becomes more acidic because the F^- ion is the conjugate weak base of the weak acid HF. ...
Monday, April 11, 2016 by Robin

Chemistry
If the heat of combustion for a specific compound is -1250.0 kJ/mol and its molar mass is 35.39 g/mol, how many grams of this compound must you burn to release 352.40 kJ of heat?
Monday, April 11, 2016 by Robert

Chemistry
For a particular isomer of C8H18, the following reaction produces 5104.1 kJ of heat per mole of C8H18(g) consumed, under standard conditions. (deltaH_rnx = -5104.1kJ) What is the standard enthalpy of formation of this isomer of C8H18(g)?
Monday, April 11, 2016 by Tiffany

Chemistry
In a constant-pressure calorimeter, 50.0 mL of 0.300 M Ba(OH)2 was added to 50.0 mL of 0.600 M HCl. The reaction caused the temperature of the solution to rise from 23.77 °C to 27.86 °C. If the solution has the same density and specific heat as water (1.00 g/mL and 4....
Monday, April 11, 2016 by Paul83

chemistry
magnessium chloride can be used to distinguish between cabonate and hydrogencarbonate ions. Describe how this is done with experimental observations
Monday, April 11, 2016 by jay

chemistry
magnessium chloride can be used to distinquish between cabonate and hydrogencarbonate ions. Descrbe how this done with experimental observations
Monday, April 11, 2016 by jay

Chemistry
What is and isotope pair?
Monday, April 11, 2016 by Bethany

Chemistry
If you had .1 ml in a 1M solution of HCl how much water would you need to dilute it to a pH of 7?
Monday, April 11, 2016 by Sabrina

chemistry
How many joules of heat are required to completely covert 95.0 grams of water to steam?
Monday, April 11, 2016 by Sandrine

chemistry
How many joules of heat are removed to completely covert 70.0 grams of water to ice at zero Celcius?
Monday, April 11, 2016 by Tammy

Chemistry
calculate the % dissociation of a 0.750M acetic acid solution and 0.50 M sodium acetate solution. I got the % for acetic acid to be 0.48% but cant finish the question.
Sunday, April 10, 2016 by Meaghan

organic chemistry
This is for a phase catalysis lab experiment 1. How is the phase transfer catalyst removed from the product? I said, by washing it with salt. 2. what purpose does washing with 15% (half-saturated) NaCl solution serve? I said, to remove bulk of water 3. There is a slight excess...
Sunday, April 10, 2016 by tols

Chemistry
If the percent yeild of the following equation is 55%, how many grams of H2SO4 are produced when 4.88 x 10^24 molecules of SO3 are combined with excess water? SO3(g)+H2O(l)->H2SO4(aq). what would be the formula to solve this equation
Sunday, April 10, 2016 by Sean

chemistry redox reactions
can someone check my labels for the reaction of a radical with an extra electron, (R(e-)) and an antioxidant, ArOH. R(e-) + ArOh --> RH + ArO(e-) R(e-) is oxidizing agent. ArOH is reducing agent. RH is reduced ArO(e-) is oxidized. Is this correct? And the other possible ...
Sunday, April 10, 2016 by Anonymous

Chemistry
In the equation 2 NaN3----2 Na + 3 N2// how much N2 would be produced if 100 grams of NaN2 completely reacted at STP?
Sunday, April 10, 2016 by Lisa

Chemistry
Make NaCl from NaHCO3 and HCl-Starting with 3.0 grams of NaHCO3-what would be a source of error on yield of purity of NaCl and what modifications could be made?
Sunday, April 10, 2016 by Lisa

Chemistry
What volume of 1.0 M NaOH must be added to 1.5 L of 1.20 M CH3COOH (ka=1.8x10^-5) to make the solution a buffer for pH 4.50? I do not understand how to determine the mols of NaOH. I tried to use the equation where: [H3O+] = ka (nHA/nA-) but it is not giving me the correct ...
Sunday, April 10, 2016 by Charles

Chemistry: Salt of weak acids and bases
If 25 mL of 0.20M NaOH is added to 20 mL of 0.25M boric acid, what is the pH of the resultant solution?
Sunday, April 10, 2016 by Wen

Chemistry
How many grams of pure uranium can theoretically be extracted from a 10.0 kg sample of pitchblende, which is 92.0% UO2? Im not looking for the answer. I would just like to know the formula to solve the problem.
Saturday, April 9, 2016 by Sean

Chemistry
Sulfur dioxide (SO2) reacts with oxygen gas to make sulfur trioxide (SO3). How many grams of oxygen are used to produce 8.11 grams of sulfur trioxide?
Saturday, April 9, 2016 by Petey

Limiting Reactant (Chemistry)
What is the limiting reactant for the following reaction if there are 3.4 moles of Ca(NO2)2 and 2.4 moles of Li3PO4? 3Ca(NO2)2 + 2Li3PO4 --> 6LiNO2 + Ca3(PO4)2 A)Ca(NO2)2 B) Li3PO4 C) LiNO2 D) Ca3(PO4)2
Saturday, April 9, 2016 by Petey

Chemistry
For the following reaction: Fe2O3 + 3CO --> 2Fe + 3CO2 how many grams of Fe2O3 is needed to produce 111 g of Fe? A) 79.3 g Fe2O3 B) 159 g Fe2O3 C) 317 g Fe2O3 D) 71.4 g Fe2O3
Saturday, April 9, 2016 by Petey

Chemistry / Stoichiometry
When 1 mol of CH4 is burned, 490 kJ of energy are released as heat. CH4 + O2 -> 2H2 + CO2 If 3.2g of CH4 are burned, what is the value of the heat of the reaction? The answer worked in class was -180 kJ, but while I was redoing problems, I got the answer 98 kJ (both ...
Saturday, April 9, 2016 by Caitlyn

Chemistry
Aqueous sulfuric acid H2SO4 will react with solid sodium hydroxide NaOH to produce aqueous sodium sulfate Na2SO4 and liquid water H2O . Suppose 31. g of sulfuric acid is mixed with 11.5 g of sodium hydroxide. Calculate the maximum mass of sodium sulfate that could be produced ...
Saturday, April 9, 2016 by Tre

chemistry
How many moles of gas must be forced into a 5.0 L tire to give it a gauge pressure of 33.6 psi at 28 ∘C? The gauge pressure is relative to atmospheric pressure. Assume that atmospheric pressure is 14.8 psi so that the total pressure in the tire is 48.4 psi . PV = nRT 48....
Saturday, April 9, 2016 by Tammy

Chemistry
Iron metal reacts with oxygen gas to produce iron(III) oxide. If you have 12.0 moles of iron, for complete reaction you need: (HINT you need the balanced chemical reaction!) A) 9.0 moles of O2 and produce 3.0 moles of Fe2O3 B) 9.0 moles of O2 and produce 6.0 moles of Fe2O3
Saturday, April 9, 2016 by Petey

Chemistry
How much water would be formed if 3.00 mol NH3 reacted with excess oxygen gas in the following equation? Given the reaction 4NH3+ 5O2 --> 4NO + 6H2O A) 2.00 mol B) 3.00 mol C) 4.50 mol D) 6.00 mol E) None of these
Saturday, April 9, 2016 by Petey

Chemistry
Propane gas is stored in a tank at a pressure of 15.0 atm at 22.0 °C. The tank can hold a pressure of 42.0 atm before bursting. During a fire the gas is heated to 600.0 °C. What is the gas pressure, and will the tank contain the gas without bursting? I know the ...
Saturday, April 9, 2016 by Drew

chemistry redox
can someone check my labels for the reaction of a radical with an extra electron, (R(e-)) and an antioxidant, ArOH. R(e-) + ArOh --> RH + ArO(e-) R(e-) is oxidizing agent. ArOH is reducing agent. RH is reduced ArO(e-) is oxidized. Is this correct? And the other possible ...
Saturday, April 9, 2016 by check my work :)

Chemistry
Question: write the balanced equations for the titration of oxalic acid (C2H2O4) with KOH. Work so far: I know that the overall equation is COOH)2 + 2KOH ------.> (COOK)2 + 2H2O but I am unsure how to proceed to the two step-wise equations
Saturday, April 9, 2016 by Alexa

Analytical chemistry
an 0.5031 gram sample of iron ore is determined through redox titration using K2Cr2O7. The sample was dissolved in HCl and all the iron was converted to the 2+ state. Titration to the endpoint required 24.34 mL of 0.01887 mol/L K2Cr2O7. Calculate the amount of Fe2O3 as a ...
Saturday, April 9, 2016 by Sam

Chemistry
what mass of hydrogen chloride gas is required to produce 250 ml of hydrochloric acid solution with a pH of 1.57
Saturday, April 9, 2016 by John

chemistry
in a liquid mixture 3 mols of component A is mixed with 2 mols of component B the activity coefficient of component A is 0.75. for a temp at 365 K determine the chemical potential of A in the mixture. chemical potential of component A in its pure state is 48.5 KJ/mol
Saturday, April 9, 2016 by saanvi

Chemistry
What is the yield of the synthesis of ammonia to 400° C and 500 atm of pressure?
Saturday, April 9, 2016 by Sabrina

Chemistry
As an eager scientist on a hot summer day you wish to determine how much ice to buy to add to your cooler which is filled with 4.0 × 101 cans of soda which are warm at 82.9°F. Each can has a mass of 378 g and ideally you want the temperature of the drinks to be 40.1&...
Saturday, April 9, 2016 by Spencer

Chemistry
what mass of hydrogen chloride gas is required to produce 250 ml of hydrochloric acid solution with a pH of 1.57 pH 1.57 H3O = 10^-1.57= .027mol/L .027(4)= .108mol/L 36.46(.108)=3.9g
Friday, April 8, 2016 by John

Chemistry
Radium-223 has a half-life of 11.4 days.Approximately how long would it take for the activity of a sample of 223Ra to decrease to 2.00 % of its initial value?
Friday, April 8, 2016 by Josh

Chemistry
If it takes 45 days for 80.0 mg of a particular radioactive isotope to decay to 10.0 mg what is its half-life?
Friday, April 8, 2016 by Josh

Chemistry
A radionuclide undergoes alpha emission, and thorium-234 is produced. What was the original radionuclide?
Friday, April 8, 2016 by Josh

Chemistry
Radium-223 nuclei usually decay by alpha emission. Once in every billion decays, a radium-223 nucleus emits a carbon-14 nucleus. Write a balanced nuclear equation for alpha emission. Write a balanced nuclear equation for carbon-14 emission.
Friday, April 8, 2016 by Josh

Chemistry
A Partially weather balloon has a volume of 195 L at a pressure of 0.993 atm. What will be the pressure in the balloon when it is inflated to a volume of 7500 L? (assume to temp. change)
Friday, April 8, 2016 by Sean

Science
A chemistry teacher needs to prepare 750 ml of a 2.5M solution of Potassium iodide for a lab. How many grams of potassium iodide will be needed to make the solution?
Friday, April 8, 2016 by Ane

Chemistry
Combine the Ksp and Kf equilibria for AgCl and Ag(NH3)2+ respectively and demonstrate Hess's law to determine the equilibrium constant for the dissolution of AgCl in NH3. AgCl + 2NH3 --> Ag(NH3)2 + Cl- K= (Ksp)(Kf) If there is only one mole of both AgCl and Ag(NH3)2, ...
Friday, April 8, 2016 by Kaitlin

Chemistry
A Balloon is inflated to 1.78 L inside a store that has its air conditioner set to 20 C What volume must the balloon be able to hold so as not to burst when it is taken outside into the 32 C summer heat?
Friday, April 8, 2016 by Tory

Chemistry
If a Gas occupies 200.0 Ml at 400 k, what volume wiall it occupy at 400 K?
Friday, April 8, 2016 by Tory

chemistry
1.how to prepare a)200ml of a 4MHCl? b)100ml of a 1.5NaOH?
Friday, April 8, 2016 by kanika

Chemistry
Why is the equivalence point pH of the HCl-TRIS titration = 4.6?
Friday, April 8, 2016 by Jeff

Chemistry
How do you prepare one liter of phosphate buffer 0.01 M at pH 12.0 from 85% phosphoric acid (density 1.69g/ml) and NaOH 1.0 M
Thursday, April 7, 2016 by Phil

Chemistry please help!
The reaction through which carbon changes from graphite to diamond form is represented by the equation C(graphite) ---> C(diamond) delta H: ? Using the reactions below, determine the amount of heat absorbed in the change of one mole of graphite to one mole of diamond C(...
Thursday, April 7, 2016 by Rose

chemistry
A nickel is about 2 millimeter thick or 2/1000 of a meter. How many nanometers is this?
Thursday, April 7, 2016 by Tom S

chemistry
In the lab, you mix 30mL of 0.30M Na2SO4 with 10mL of 0.25M Ba(OH)2 to produce BaSO4 and NaOH. Calculate the theoretical yield (in moles) of BaSO4 produced from this reaction. State your answer in decimal form and round to two sig. fig. (not scientific notation).
Thursday, April 7, 2016 by Liyah

Chemistry
Calculate the amount of water you need to add (in mL) to 30mL of 1.5M HCl to dilute it to a concentration of 1.25M.
Thursday, April 7, 2016 by Liyah

chemistry
What is the molarity of the following solutions? A. 0.96 g MgCl2 in 500 mL solution B. 9.33 g Na2S in 450 mL solution C. 2.48 g CaF2 in 375 mL solution
Thursday, April 7, 2016 by justin

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