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October 22, 2014

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

Post a New Question | Current Questions

chemistry
You need 715 mL of a 45% alcohol solution. On hand, you have a 55% alcohol mixture. How much of the 55% alcohol mixture and pure water will you need to obtain the desired solution?
Saturday, October 18, 2014 at 3:06pm

Chemistry Check
Determine the missing values of deltaH in the diagram shown below ^ | ^ N2O3(g) + 1/2 O2(g) (Enthalpy)| | ^ | | deltaH= +16.02 | | | | | | 2 NO2(g) | | | ^ | |deltaH=? | | | | | | deltaH=?| | | | | | | | N2(g)+202(g) | Answer: Delta H for the right= 66.36 Delta H for the left...
Saturday, October 18, 2014 at 2:21pm

chemistry
Situation: You have 100ml of isotopically labelled water 3H2o. That is, the water is made with the radioactive isotope of hydrogen, tritium, 3H. Compounds that contain radioactive isotopes are called "hot." You pour this 100 mL of "hot" water into the ocean...
Saturday, October 18, 2014 at 1:23pm

Chemistry
What is the maximum velocity (in m/s) acquired by an alpha particle when accelerated between two plates with a potential difference of 580.0 volts? Note: An alpha particle is essentially the nucleus of a helium atom - 2 protons and 2 neutrons.
Saturday, October 18, 2014 at 11:32am

Chemistry
7. The specific heat of wood is 2.03 J/g∙°C. How much heat is needed to convert 550. g of wood at -15.0°C to 10.0°C?
Saturday, October 18, 2014 at 10:50am

Chemistry
1)What could have caused the impurity in the sodium hydroxide solution? 2)Why was it necessary to dilute the hydrochloric acid before carrying out the titration? This was a question from a titration practical in which we had to dilute HCL then use that along with 25cm3 of NaOH...
Saturday, October 18, 2014 at 5:38am

chemistry
A dilute solution of sulfiric acid is added to 15g of copper and iron mixture. a) the volume of h2 envolved at standard conditions is 4.48L what is the mass of each of the metals constituting the mixture ? Vm=24l.mol.
Saturday, October 18, 2014 at 5:33am

chemistry
Table salt, NaCl(s), and sugar, C12H22O11(s), are accidentally mixed. A 4.00-g sample is burned, and 3.30 g of CO2(g) is produced. What was the mass percentage of the table salt in the mixture?
Friday, October 17, 2014 at 7:56pm

Chemistry
Ho w
much 
water
 would 
you 
need 
to
 add
 to

500
mL
 of 
a 
0.3
M
 calcium
 nitrate 
solution
 to 
make the
 solution
 0.1
M? A.
...
Friday, October 17, 2014 at 4:08pm

Chemistry 101
Based on the masses of CaCl2 and Na3PO4 you determine from the periodic table,what mass combining ratio would you predict?
Friday, October 17, 2014 at 3:46pm

chemistry
what volume of 0.150M Li2Sr solution is required to completely react with 130ml of 0.150M Co(NO3)2
Friday, October 17, 2014 at 1:49am

chemistry
Propane (C3H8) which is used as fuel in BBQ tanks often contains some butane(C4H10). A sample of a fuel mixture known to contain both propane and butane occupies a certain volume at a total pressure of 30 mmHg. The sample is then burned completely to produce CO2 and H2O. The ...
Friday, October 17, 2014 at 1:14am

chemistry
A co-op student designed an experiment to collect hydrogen gas by reacting iron with a hydrochloric acid (HCl) solution. The student’s co-op supervisor suggested that aluminum can also be included to generate hydrogen gas: Fe + 2 HCl → 2 FeCl2 + H2 2 Al + 6 HCl &#...
Friday, October 17, 2014 at 1:12am

Chemistry
If 4.7M SrLi2 solution is diluted to 45L, what is the molarity of the diluted solution?
Friday, October 17, 2014 at 12:45am

CHEMISTRY
Find the number of SiO2 formula units in m = 1.90g of quartz.
Thursday, October 16, 2014 at 10:35pm

chemistry
a sample of freon-12 occupies 25.5 litters at 28 celsius find its volume at 15 degree celcius when the pressure is kept constant
Thursday, October 16, 2014 at 10:29pm

chemistry
How would you prepare 385 ml of a 0.856 m NaOH solution starting with a 4.93 m stock solution
Thursday, October 16, 2014 at 10:24pm

chemistry
How many grams of HCl are formed from reaction of 3.58g of H2 with 8.90g of Cl2?
Thursday, October 16, 2014 at 10:04pm

chemistry
how many sig figs are in 85,100?
Thursday, October 16, 2014 at 8:11pm

Chemistry
A 2.764 g sample containing only iron and aluminum metal was treated with acid to form Al(+3) and Fe(+2). The sample was then titrated with a potassium dichromate solution (only the Fe(II) will react with the dichromate). The sample was found to be equivalent to 14.36 mL of 0....
Thursday, October 16, 2014 at 7:35pm

Chemistry
when 2 moles of potassium chlorate crystals decompose to potassium chloride crystals and oxygen gas at a constant pressure and temperature, 78.0 kj of heat is given off. write a thermodynamic equation for this reaction.I don't know how to set up the equation i know that ...
Thursday, October 16, 2014 at 7:11pm

chemistry
what is the volume of 3.85x10^24 molecules of AMmmonium Bromide? please explain I'm confused
Thursday, October 16, 2014 at 5:01pm

Chemistry
1/2 H2(g) + 1/2 I2(g) -> HI(g) △H= +28kJ The activation energy for the formation of HI is 167kJ. The activation energy for the decomposition of HI is A. 28kJ B.139kJ C.167kJ D.195kJ I know it is an endothermic reaction.
Thursday, October 16, 2014 at 3:58pm

Chemistry
Please help! I don't understand these questions at all. :( Fe2O3(s) + 2Al(s) -> Al2O3(s) + 2Fe(l) If 0.50 mol of Fe is produced in 10 secs, what is the rate of consumption of Fe2O3 in mol/s? A. 5.0 x 10^-2 mol/s B. 2.5 x 10^-2 mol/s C. 1.0 x 10^-1mol/s D. 5.0 mol/s ...
Thursday, October 16, 2014 at 3:38pm

Chemistry
Increasing the surface area will increase the reaction rate in: 1. N2(g) + O2(g) -> 2NO(g) 2. 2Mg(s) + O2(g) -> 2MgO(s) 3. CaCO3(s) + 2H+(aq) -> Ca2+(aq) + H2O(l) + CO2(g) MY WORK: I think it is 2 & possibly 3. 1 is a homogeneous reaction but is 3 a heterogeneous ...
Thursday, October 16, 2014 at 3:16pm

chemistry
Calculate the theoretical yield of alum if 0.200g of Aluminum was reacted with excess KOH and H2SO4? I don't even know how to start it. Please help. Also I wanted to say thank you for the help I've gotten from this website it has helped me a lot. I feel like I'm ...
Thursday, October 16, 2014 at 12:48pm

Chemistry
If 6.0 g of Oxygen (O2) reacts with 12.0 g of hydrogen (H2) to give 5.0 g of dihydrogen monoxide. What's the % yield?
Thursday, October 16, 2014 at 12:11pm

Chemistry
A student determines the iron (II) content of a solution by first precipitating it as iron (II) hydroxide, and then decomposing the hydroxide to iron (II) oxide by heating. How many grams of iron (II) oxide should the student obtain if her solution contains 46.0 mL of 0.426 M ...
Thursday, October 16, 2014 at 11:54am

Chemistry
Calculate the number of milliliters of 0.782 M KOH required to precipitate all of the Mn2+ ions in 112 mL of 0.461 M Mn(NO3)2 solution as Mn(OH)2.
Thursday, October 16, 2014 at 11:40am

chemistry
Twenty grams of aluminum metal at 83.2 C were mixed with 49.3 g of water at 19.7 C. Assuming no heat loss, what was the final temperature of the Aluminum water metal? specific heat for Al= 0.215 specific heat for H2O=1.00
Wednesday, October 15, 2014 at 11:58pm

chemistry
A 1.07g sample of sulfur was burned in a bomb calorimeter whose calorimeter constant is 2.03 k cal/C. If the resulting temperature change was 1.17 C, what is the molar heat of combustion for sulfur?
Wednesday, October 15, 2014 at 11:56pm

Chemistry
A compound containing boron and hydrogen has been synthesized. You perform two experiments to determine the molecular formula of the compound. A 0.492 g sample of the compound is burned in pure oxygen to produce B2O3 and 0.540 g of water. In the second experiment, when a 63.1 ...
Wednesday, October 15, 2014 at 11:07pm

chemistry
Why is the crude product isoamyl bromide washed with water from isoamyl alcohol? (What is removed by this wash?)
Wednesday, October 15, 2014 at 10:26pm

chemistry
1) Aqueous solutions of potassium sulfate and ammonium nitrate are mixed together. Which statement is correct? A) Both KNO3 and NH4SO4 precipitate from solution B) A gas is released C) NH4SO4 will precipitate from solution D) KNO3 will precipitate from solution E) No reaction ...
Wednesday, October 15, 2014 at 9:59pm

Chemistry
How many numbers of oxygen molecules are present in 3 liters of CO2 at STP?
Wednesday, October 15, 2014 at 9:48pm

Chemistry
Does anyone know a website with practice problems (and answers) regarding quantitative chemistry? I haven't been able to find anything on Google.
Wednesday, October 15, 2014 at 9:36pm

Chemistry
Calculate the mass of water having the same number of hydrogen atoms as are present in 32 gm of methane.
Wednesday, October 15, 2014 at 9:32pm

CHEMISTRY
Balance the following equation. (for a balanced eq. aA + bB → cC + dD, enter your answer as the integer abcd) CrO42−(aq) + H2O(l) + HSnO2− → CrO2−(aq) + OH−(aq) + HSnO3−(aq)
Wednesday, October 15, 2014 at 9:01pm

Chemistry
What volume of CO2 gas is produced when 20 gm of 20% pure CaCO3 is completely heated?
Wednesday, October 15, 2014 at 8:57pm

Chemistry
a 191 g piece of copper is heated to 100 C in a boiling water bath and then dropped into a beaker containing 755 g of water (density =1.00 g/cm3) at 4.0 C. What is the final temperature of the copper and water after thermal equilibrium is reached? (Scu=0.385 J/g•K)
Wednesday, October 15, 2014 at 8:22pm

chemistry
source of errors in determining transport number of k+ ion by moving boundary method
Wednesday, October 15, 2014 at 4:58pm

chemistry
Sodium chloride is formed by the following reaction: NaOH + HCl --> NaCl + H2O How many grams of water are formed when 10 g of HCl is consumed? Round your answer to one decimal place, do not include units or commas. use the molar masses in your text to two decimal places.
Wednesday, October 15, 2014 at 4:00pm

chemistry
A mixture containing 15 g of carbon and 25 g of oxygen is sealed in a flask. The total mass of the system is 140 g. The flask is then heated to cause the carbon and oxygen to react. The sealed flask is then weighed. What is the final weight of the system?
Wednesday, October 15, 2014 at 2:20pm

chemistry
Describe how to make 450mL of a 1.15% solution of CuSO4
Wednesday, October 15, 2014 at 10:40am

chemistry
How many grams of NaOH are contained in 5.0 × 102 mL of a 0.77 M sodium hydroxide solution? The molar mass of NaOH is 40.0 g/mol.
Wednesday, October 15, 2014 at 2:36am

Introductory Chemistry
Calcium chloride is 36.11% calcium by mass. How many grams of calcium are in 40.0 grams of calcium chloride
Wednesday, October 15, 2014 at 2:07am

Chemistry
A hot air balloon is filled with 1.31 × 106 L of an ideal gas on a cool morning (11 °C). The air is heated to 129 °C. What is the volume of the air in the balloon after it is heated? Assume that none of the gas escapes from the balloon.
Tuesday, October 14, 2014 at 10:25pm

chemistry
if you have 125.0g of water at 100.0, how much energy must be added to vaporize all of it
Tuesday, October 14, 2014 at 9:42pm

Chemistry
The speed of light in a vacuum is 2.998 x 10^8 m/s. What is the speed of light in miles per hour? (1 km = 06214 miles)
Tuesday, October 14, 2014 at 9:27pm

Separation of Racemate- Chemistry Lab
Compare the relative reaction rates of 1-bromobutane, 2-bromopropane, and 2-bromomethylpropane under SN1 reaction conditions. Silver nitrate will be used to provide nitrate ion as the nucleophile to produce alkyl nitrates as products. 1) I found the answer for this one. 2) You...
Tuesday, October 14, 2014 at 9:08pm

chemistry
When 1.933 g of KNO3 is dissolved in 200 g of water initially at 23.57 ¢ªCelsius in a coffee-cup calorimeter, the final temperature is found to be 22.63 ¢ªCelsius. Calculate the heat released/absorbed per gram of KNO3 and per mol of KNO3 when KNO3 dissolves...
Tuesday, October 14, 2014 at 8:54pm

chemistry
how could solid magnesium phosphate be prepared and collected using hydrochloric acid, sodium phosphate solution, water and magnesium? For the answer, write a series of steps that describe the procedure and includes a balanced chemical equation for each step
Tuesday, October 14, 2014 at 8:40pm

Chemistry
A 32.3-L of a gas at 30 degrees Celsius and 1.20 atm is to be cooled at constant pressure until its volume becomes 28.4 L. What will be the new gas temperature?
Tuesday, October 14, 2014 at 8:22pm

chemistry
When 2.5g of ammonium dichromate is heated, the mass of nitrogen and water vapor released is 1.0g. What is the final mass of the solid product?
Tuesday, October 14, 2014 at 7:53pm

Separation of Racemate- Chemistry Lab
Compare the relative reaction rates of 1-bromobutane, 2-bromopropane, and 2-bromomethylpropane under SN1 reaction conditions. Silver nitrate will be used to provide nitrate ion as the nucleophile to produce alkyl nitrates as products. 1) You have a choice of acetone or ethanol...
Tuesday, October 14, 2014 at 7:36pm

chemistry
Calcium metal is heated with oxygen gas to yield calcium oxide.
Tuesday, October 14, 2014 at 7:31pm

Grade 9 Chemistry
which is more reactive k or ca? ( from periodic table.) when poured in water?
Tuesday, October 14, 2014 at 6:56pm

Chemistry
Predict the physical properties and relative reactivity of Rb, Cs, and Fr (From the periodic table)
Tuesday, October 14, 2014 at 6:13pm

Chemistry
A pure copper sphere ha a radius of 0.935in. How many moles of copper does it contain? The volume of a sphere is (4/3)3.14r^3, and the density of the copper is 8.96g/cm^3. (1 in. = 2.54cm)
Tuesday, October 14, 2014 at 1:49pm

Chemistry
I was doing a lab and stared off with 10mL of HNO3 and the mass of copper which was 1.5120g. The question now is: With initial mass of copper wire being 1.5120g, calculate the volume of (16M) nitric acid that is required to fully react with the copper. Cu(s)+2HNO3(aq) --> ...
Tuesday, October 14, 2014 at 9:16am

Chemistry
Hi was looking to get some help with an experiment. Currently I trying to determine the amount iron in cereal. And was hoping to get some help with one of the questions I have been given. First off I am the recorded absorbance across the region 470 – 490 nm for the 3.00 ...
Tuesday, October 14, 2014 at 9:12am

Chemistry
How many moles of solid Mg(OH)2 should you add to 200mL of 0.15M lactic acid solution to produce pH 4.0 buffer? -I don't know how to do this w/0 knowing pKa, but I don't think the point is to look up pKa. Is there some other way to solve this?
Tuesday, October 14, 2014 at 4:28am

Chemistry
Do you expect CaCl(s) to be stable if the 1st ionization energy of Calcium is approx. 590 kj/mol, the Lattice Energy is approx 700 kj/mol and the total change in enthalpy is -36? Why?
Tuesday, October 14, 2014 at 1:44am

chemistry
A solution of sodium thiosulfate, Na2S2O3, is 0.4206 M. 28.94 mL of this solution reacts with 5.89 mL of I2 solution. What is the molarity of the I2 solution?
Tuesday, October 14, 2014 at 12:22am

chemistry
How long does it take light to travel each of the following distances 2462 mi, the distance between Los Angeles and New York. How do we calculate how fast light travels?
Monday, October 13, 2014 at 11:00pm

Chemistry 30
Calculate the delta H for the reaction : 2H3BO3(aq) reacts with B2O3(solid) + 3H2O
Monday, October 13, 2014 at 10:18pm

chemistry
A mixture containing 2.81 g each of CH4 (g), C2H4 (g) and C4H10 (g) is contained in a 1.50 L flask at a temperature of 35 oC. What is the partial pressure (in atm) of C4H10 (g)?
Monday, October 13, 2014 at 9:00pm

chemistry
What mass (in gram of air) is filled in a hot balloon when it is finflated (at 95oC) to a volume of 500 L at 1.15 atm? (The average molar mass of air is 29 g/mol)
Monday, October 13, 2014 at 8:41pm

chemistry
You have prepared 20.00 mL of a buffer, using 4.00 mL 0.010 M HA (weak acid) and 3.00 mL 0.010 M NaA (provides A-, the conjugate base of HA). pKa for HA is 6.25. How many moles of HA will be present in the mixture after addition of 0.20 mL 0.010 M NaOH?
Monday, October 13, 2014 at 8:08pm

Chemistry
How many moles of solid Mg(OH)2 should you add to 200mL of 0.15M lactic acid solution to produce pH 4.0 buffer?
Monday, October 13, 2014 at 7:54pm

chemistry/toxicology/instrumental analysis
A standard curve was produced using absorbance values of prepared standards obtained by UV spectrophotometry. The standards were made using concentrated hydrochloric acid as opposed to the 1N HCl that the lab manual says should be used. Because of this my absorbance values are...
Monday, October 13, 2014 at 7:50pm

chemistry
what is the final M solution prepared by diluting 5.0 mL of 6.0 M HCl to 60.0 mL
Monday, October 13, 2014 at 7:33pm

Chemistry
How many moles of solid Mg(OH)2 should you add to 200mL of 0.15M lactic acid solution to produce pH 4.0 buffer?
Monday, October 13, 2014 at 6:39pm

Chemistry Equation
1) Write the equation for the reaction associated with the Ka2 of sulfuric acid, H2SO4. 2)Write the equation for the reaction associated with the Kb2 of carbonate, CO3^(2-).
Monday, October 13, 2014 at 6:36pm

chemistry pH
A 25 mL sample of 0.29 M LiOH analyte was titrated with 0.75 M HI at 25 degree Celsius. 1)Calculate the initial pH before any titrant was added. 2) Then calculate the pH of the solution after 5 mL of titrant was added.
Monday, October 13, 2014 at 6:34pm

chemistry
Equal volumes of 0.220 M weak base (Kb=4.0x10^-9) and 0.220 M HCl are mixed. Calculate the pH of the resulting solution
Monday, October 13, 2014 at 6:32pm

chemistry
Nitric acid, HNO3, was first prepared 1200 years ago by heating naturally occurring sodium nitrate (called saltpeter) with sulfuric acid to produce sodium bisulfate and collecting the vapors of HNO3 produced. Calculate ΔH°rxn for this reaction. ΔH°f[NaNO3(s...
Monday, October 13, 2014 at 6:16pm

Chemistry
For a tablet containing 500mg vitamin C, Calculate how many mL of 0.095M NaOH are required for titration ( molar mass of ascorbic acid- vitamin c is 1.76.12g/mol) I am not sure of the conversions to use, how to get started with the question.
Monday, October 13, 2014 at 5:53pm

chemistry
Are the characteristics or properties of the elements making up a compound different from the characteristics or properties of the compound? For example, are the properties of oxygen and hydrogen different from the properties of water? Explain.
Monday, October 13, 2014 at 5:20pm

College Chemistry lab
How do I Calculate the concentration of iron(lll) with absorbance measurement. Wavelength is 480nm, solution is 1 ml FeCl3 : 9ml HCl, absorption is .250A, concentration of stock FeCl3 solution is 0.00050M and stock HCl solution is 2.0M. I not sure how to use beer's law to ...
Monday, October 13, 2014 at 4:20pm

chemistry
Nitric acid, HNO3, was first prepared 1200 years ago by heating naturally occurring sodium nitrate (called saltpeter) with sulfuric acid to produce sodium bisulfate and collecting the vapors of HNO3 produced. Calculate ΔH°rxn for this reaction. ΔH°f[NaNO3(s...
Monday, October 13, 2014 at 3:09pm

Chemistry
Cambridge uses FA 1, FA 2 etc to name chemicals or solutions. What does FA stand for?
Monday, October 13, 2014 at 12:15pm

chemistry
A carbonate ion, CO32−, can participate in an acid-base reaction. How should the carbonate ion be classified?
Monday, October 13, 2014 at 12:11pm

chemistry/math
5.0 moles of solid sodium chloride (NaCl) are used to prepare a 5.0 M NaCl solution. What is the volume of the solution?
Monday, October 13, 2014 at 12:06pm

chemistry
How many moles of magnesium chloride are formed when 55 mL of 0.70 M HCl is added to 42 mL of 1.204 g Mg(OH)2? Mg(OH)2(s) + 2HCl(aq) MgCl2(aq) + 2H2O(l) A. 0.019 mol B. 0.012 mol C. 0.021 mol D. 0.039 mol
Monday, October 13, 2014 at 11:45am

Chemistry
Molecular, ionic, and net ionic equations for ammonium chloride + potassium sulfate. Also what is the observation. Is it 2NH2Cl + Na2SO4 = (NH4)2SO4 + 2NaCl???? Please help!
Monday, October 13, 2014 at 5:03am

Chemistry 101
A solution containing 83.100 g of sodium hydroxide [molar mass = 40.0 g/mol] was neutralised using phosphoric acid. Calculate the moles of sodium phosphate formed (assuming that the reaction goes to completion). Give your answer to three significant figures. I'm not sure ...
Monday, October 13, 2014 at 2:19am

chemistry
To resolve an object in an electron microscope, the wavelength of the electrons must be close to the diameter of the object. What kinetic energy must the electrons have in order to resolve a protein molecule that is 7.00 nm in diameter? Take the mass of an electron to be 9.11&...
Sunday, October 12, 2014 at 11:44pm

chemistry
A beaker contain 300.ml of a 0,20 M Pb(NO3) solution. If 200 ml of 0,20M solution og MgCl2 is added to the beaker, What will be the concentration of Pb2+ ions in the resulting solution
Sunday, October 12, 2014 at 11:22pm

chemistry
An unknown diprotic acid requires 26.66 mL of 0.117 M NaOH to completely neutralize a 0.845 g sample. what is the molar mass of the acid?
Sunday, October 12, 2014 at 10:03pm

Organic Chemistry
Aqueous sodium bicarbonate was used to wash the crude t-pently chloride. What was the purpose of the wash? give equations.
Sunday, October 12, 2014 at 8:12pm

chemistry
A student weighs out 0.568 g of KHP (molar mass = 204 g/mol) and titrates to the equivalence point with 36.78 mL of a stock NaOH solution. What is the concentration of the stock NaOH solution? KHP is an acid with one acidic proton. a. 3.15 M b. 0.0757 M c. 0.943 M d. 0.100 M ...
Sunday, October 12, 2014 at 7:10pm

chemistry
5.00g aluminum sulfide and 10.0g water react according to the reaction: Al2S3 + 6 H2O -> 2 Al(OH)3 + 3 H2S What is maximum mass of H2S that can be formed? What mass of excess reactant remains when the reaction is complete?
Sunday, October 12, 2014 at 5:31pm

chemistry
What weight of lead nitrate in grams would need to be dissolved in 400 mL of water to prepare a 270 ppm solution of Pb2+?
Sunday, October 12, 2014 at 5:24pm

Chemistry
It is easy but I cannot solve or do buffer questions/slns.. Please help. Describe the preparation of 500 ml of 1 M phosphate buffer at pH 7.2.
Sunday, October 12, 2014 at 3:59pm

Chemistry
Orbital Hybridization of CH2Cl2?
Sunday, October 12, 2014 at 3:39pm

CHEMISTRY
If precipitation of BaSO4 is incomplete due to inadequate heating or insufficient time what will happen to the sulfate percent error determination? And why?
Sunday, October 12, 2014 at 3:31pm

Chemistry
If the density of ocean water at depth of 10,000m is 1.071g/ml and if 25.0g of water at that depth contains 190mg of KCl what is the molarity of KCL?
Sunday, October 12, 2014 at 3:01pm

chemistry
An analytical procedure requires a solution of chloride ions ,How many grams of CaCl2 must be disolved to make2.15L of 0.0520 M C
Sunday, October 12, 2014 at 3:00pm

Chemistry
If you wanted to make a barometer that had a column of liquid about 6ft tall what would the density of the liquid have to be? 1meter=3.28ft 1in=2.54cm Density Hg=13.6g/ml 1atm=760torr
Sunday, October 12, 2014 at 2:42pm

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