Thursday
July 2, 2015

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

Chemistry
Determine the number of molecules of the compound iron phosphate with 129.68 g Fe3(PO4)2
Sunday, March 22, 2015 by Sheila

chemistry
Consider the reaction 2 NO2 (g) ⇌ 2 NO (g) + O2 (g). If the initial partial pressure of NO2 (g) is 3.0 bar, and x is the equilibrium pressure of O2 (g), what is the correct equilibrium relation?
Sunday, March 22, 2015 by lee

Chemistry
I found this on the internet and I need an explanation. Q: You want to make sure a large weather balloon does not burst and wish to check the temperature at 3000 meters altitude. The balloon manufacture guarantees the balloon up to 60.0 Liters in size. Will the balloon make it...
Sunday, March 22, 2015 by Jane

general chemistry
How many grams of NaOH are required to prepare 250 mL of 0.205 M NaOH? SHOW ALL WORK and include units. I don't know how to set this up.
Sunday, March 22, 2015 by cassie

chemistry
Write a balanced chemical equation for the neutralization reaction between aqueous hydrochloric acid and aqueous calcium hydroxide. Be sure the formulas are written correctly before balancing, and include phases. HCl+H2CaO2 im not sure that's written correctly but that is ...
Sunday, March 22, 2015 by jessica

Chemistry
A sodium chloride solution has a density of 1.22 g/mL. How many moles of NaCl are dissolved in 10.0 mL of the solution? The density of water is 1.00 g/mL. My solution: ? mol NaCl = 10 mL*1.22 g/1mL*1mL/58.5g The correct answer is 3.76*10^2 mol. Please help!
Sunday, March 22, 2015 by Anonymous

Chemistry
If there are 57.6 mL of water that change from 19.4 degrees Celsius to 34.7 degrees Celsius, calculate the number of joules of energy transferred in the form of heat. Round to the nearest whole number. The specific heat capacity of water is 4.18 J/g*C and density of water is 1...
Sunday, March 22, 2015 by Alex

Chemistry
0.24g of a volatile substance,upon vaporisation,gives 45ml vapour at NTP what will be the vapour density of the substance?
Sunday, March 22, 2015 by Tanya

CHEMISTRY
The average kinetic energy of an ideal gas,per molecule in S.I units at 25°C will be
Sunday, March 22, 2015 by Tanya

CHEMISTRY
At 25°C and 730 mm pressure,380 ml of dry oxygen was collected.If the temperature is constant ,what volume will the oxygen occupy at 760 mm pressure ? ANSWER- 365ml
Sunday, March 22, 2015 by Tanya

CHEMISTRY
The pressure exerted by 6.0g of methane gas in a 0.03m3 vessel at 129degreeC is.
Sunday, March 22, 2015 by Tanya

CHEMISTRY
A gaseous mixture was prepared by taking equal mole of CO and N2 .if the total pressure of the mixture was found 1 atmosphere ,the partial pressure of nitrogen (N2) in the mixture is.
Sunday, March 22, 2015 by Tanya

Chemistry
A 20.00 mL sample of a .1000M unknown acid solution is titrated with .1000M NaOH. Given that the acid is diprotic and its pKa's are 1.90 and 6.70 a.) Estimate the pH after 10 mL of base are added b.) estimate the pH after 20 mL of base are added c.) estimate the pH after ...
Sunday, March 22, 2015 by lawerence

Chemistry
Can someone please answer one of these question so I would be able to know how to do the others? 1. What volume of 0.275 M KOH (aq) must be added to 75.0 mL of 0.137 M H3AsO4 (aq) to reach (a) the first stoichiometric pony; (b) the second stoichiometric point 2. What volume of...
Sunday, March 22, 2015 by Anonymous

Chemistry
If 20dm3 methane was burned in pure oxygen: CH4(g) + 2O2(g) arrow CO2(g) + 2H2O(l) how do I work out the volume of carbon dioxide made? And what volume of oxygen would be required? Thank you.
Sunday, March 22, 2015 by Maria

Chemistry
How many milliliters of 0.258 M NiCl2 solution are needed to react completely with 20.0 mL of 0.153 M Na2CO3 solution? How many grams of NiCO3 will be formed? The reaction is Na2CO3(aq) +NiCl2 (aq)----> NiCO3(s)+2NaCl I solved for the 1st part, 11.8 M NiCl2 I am not sure ...
Sunday, March 22, 2015 by Stacie

chemistry
269 mL of a 0.2089 M sodium carbonate (Na2CO3) solution is prepared and labelled "Solution A".
Sunday, March 22, 2015 by B

Chemistry
Can a pH be below 1?
Sunday, March 22, 2015 by itskath

chemistry
The average swimming pool has a volume of about 28,000 gallons. Suppose a swimming pool was filled with pH 7.00 water. However, you need to adjust the pH to 4.75. How much acid pool acid (which is 1.00 M HCl) do you need to add to the pool? The units are liters. convert ...
Saturday, March 21, 2015 by danny

chemistry
Hey, I'm struggling a bit with this thermal energy question: One major cost in the brewing history is the cost of energy used in running a plant. Much of the heating plant is accomplished by the cooling and or condensing of steam. When 50.0 mg of griest is heated from 25.0...
Saturday, March 21, 2015 by Yana

Chemistry
The equilibrium constant, Kp, for the following reaction is 0.497 at 500 K: PCl5(g) PCl3(g) + Cl2(g) Calculate the equilibrium partial pressures of all species when PCl5(g) is introduced into an evacuated flask at a pressure of 1.46 atm at 500 K. PPCl5 = atm PPCl3 = atm PCl2...
Saturday, March 21, 2015 by Kayla23

Chemistry 2
The equilibrium constant, Kc, for the following reaction is 1.54E-2 at 643 K. 2HI(g) H2(g) + I2(g) When a sufficiently large sample of HI(g) is introduced into an evacuated vessel at 643 K, the equilibrium concentration of I2(g) is found to be 0.351 M. Calculate the ...
Saturday, March 21, 2015 by Mariah

chemistry
You need to determine the pKa of a weak, monoprotic acid. You add 0.500 moles of the acid to 1.00 L of water. The resulting pH was 1.87. What is the pKa of this weak acid? You may ignore the autoionization of water. 2.74 3.43 5.38 2.01 1.87
Saturday, March 21, 2015 by danny

chemistry
All of the following acid-base pairs are examples of buffers EXCEPT: (Question from "Cracking the MCAT, 2010-2011 edition" by The Princeton Review) HCl/NaCl CH3CO2H/NaCH3CO2 HF/NaF H2CO3/NaHCO3 I chose ch3co2h/nach3co2
Saturday, March 21, 2015 by danny

chemistry
What is the pH of 500 mL of water that had 0.00150 grams of NaOH added to it? The units are pH units with an error interval of 0.1 units. 0.00150 divided by 40NaOH 3.75e-5 divided that by 500= 7.5e-8 -log7.5e-8 =7.12 im lost on the last step
Saturday, March 21, 2015 by danny

chemistry
If 350 grams of pure fe2o3 is used, how grams of can be produced? the reaction is: fe2+3c---2fe+3co
Saturday, March 21, 2015 by wen

chemistry
The Ka of hypochlorous acid (HClO) is 3.00×10-8 at 25.0°C. Calculate the pH of a 0.0385 M hypochlorous acid solution. a.1.41 b.7.52 c.-1.41 D.4.47 E. 8.94 I got B 7.52 but i feel like im wrong
Saturday, March 21, 2015 by danny

Chemistry 2
The equilibrium constant, Kc, for the following reaction is 1.54E-2 at 643 K. 2HI(g) H2(g) + I2(g) When a sufficiently large sample of HI(g) is introduced into an evacuated vessel at 643 K, the equilibrium concentration of I2(g) is found to be 0.351 M. Calculate the ...
Saturday, March 21, 2015 by Mariah

chemistry
A 300 mL solution of 0.0500 M HCl is titrated with 1.00 M KOH. How many mL of the KOH solution will be needed to reach the equivalence point of this titration? A.5 mL B.10 mL C.50 mL D20 mL E15 mL The answer i got was E. 15ml
Saturday, March 21, 2015 by danny

chemistry
I'm adding these three atomic weights (40.1+12.0+48.0) together, and I got 100.1 How can I round my answer to three significant figures? thank you!
Saturday, March 21, 2015 by ally

chemistry
Which of the following acids is expected to be the strongest acid? CH2F-COOH CF3-COOH CH3-COOH CCl3-COOH CBr3-COOH i chose ccl3-cooh
Saturday, March 21, 2015 by danny

Analytical Chemistry
Indicate whether the following half-cells would act as an anode or a cathode when coupled with a S.H.E. in a galvanic cell. Calculate cell potential: Pt/O2(800 torr)/HCl(2.5E-5 M) I have not figured out a way to approach this problem. I know the nernst comes in, but I am at a ...
Saturday, March 21, 2015 by Steve

chemistry
Which of the following chemicals are bases or can behave like bases? You may select more than one compound. KOH PO43- NH3 F-
Saturday, March 21, 2015 by danny

chemistry
Which of the following chemicals are bases or can behave like bases? You may select more than one compound. Cu2+ RbOH CH3COO- Br-
Saturday, March 21, 2015 by danny

chemistry
Which of the following chemicals are strong bases? You may select more than one compound. CH2=CH2 Ca(OH)2 NH3 RbOH
Saturday, March 21, 2015 by danny

chemistry
The Ka of hypochlorous acid (HClO) is 3.00×10-8 at 25.0°C. Calculate the pH of a 0.0385 M hypochlorous acid solution. A.1.41 B.7.52 C.-1.41 D.4.47 E.8.94 I chose B
Saturday, March 21, 2015 by danny

chemistry
net ionic equation for reaction between copper carbonate and the hydroiodic acid
Saturday, March 21, 2015 by Jeff

Chemistry
At 500 degrees celsius, K for the formation of ammonia from nitrogen and hydrogen gases is 1.5x10-5. N2(g)+3H2(g)->/<-2NH3(g) Calculate the equilibrium partial pressure of hydrogen if the equilibrium partial pressures of ammonia and nitrogen are 0.015 atm and 1.2 atm, ...
Saturday, March 21, 2015 by Jessica

Chemistry
I am having difficulty with balancing this acidic solution; I2+OCl{-} ----> IO3{-} +Cl{-} I get: I2 = OCl{-} +2H2O -----> IO3{-} +Cl{-} + 3H{+} The charges don't balance... What am I doing wrong?
Saturday, March 21, 2015 by Stacie

Chemistry
A 10.0-mL solution of 0.300 M NH3 is titrated with a 0.100 M HCl solution. Calculate the pH after the following additions of the HCl solution: a) 0.00 mL b) 10.0 mL c) 20.0 mL c) 30.0 mL d) 40.0 mL **I know how to solve the problem but I keep getting answers that are exactly ...
Saturday, March 21, 2015 by Sandhya

science chemistry
Calculate the relative atomic mass of Limestone CaCo3 Methanol CH3oH Sulphric acid Ca(No3)2. (Ca=40.1,C=12,O=16,H=1,S=32).
Saturday, March 21, 2015 by compound

chemistry
Calculate the volume of NaOH 0.1M that needs to be calculated to be added to a 30ml o-phosphoric acid 0.1 in order to prepare solutions of pH 7.5 and pH 6.9? pKa3= 2.15; pKa2=7.2; pKa1 = 12.1
Saturday, March 21, 2015 by Adeola

Chemistry
You are titrating 50ml of a 0.02M solution of Zn^+2 at pH 7 with 0.05M solution of EDTA. What is the [Zn+2] after 20mL of EDTA has been added? Kzny=3x10^16
Saturday, March 21, 2015 by Bear

chemistry
Calculate ▲U,▲H, ▲S, ▲A and▲G in expanding 1 mole of ideal gas at 25 ° c from 10 to 100 dm cubed. (5marks )
Saturday, March 21, 2015 by Joseph

chemistry
Distinguish clearly between ▲G for a reaction and ▲S of the same reaction. Which of the two is used to predict whether a reaction is spontaneous? why? (4 marks)
Saturday, March 21, 2015 by Joseph

chemistry
The standard Gibbs free energy of formation of ammonia at 25 ° c is - 16.5kj per mole.calculate the value of equilibrium constant Kp at this temperature for this reaction. ( 5marks )
Saturday, March 21, 2015 by muli

Chemistry
How many grams of CO(g) are there in 67.0mL of the gas at 0.826atm and 30 ∘C?
Friday, March 20, 2015 by Brandon

chemistry
Consider the following reaction. SO3(g) + H2O(l) → H2SO4(aq) A chemist allows 60.9 g of SO3 and 11.1 g of H2O to react. When the reaction is finished, the chemist collects 54.4 g of H2SO4. Determine the limiting reactant, theoretical yield, and percent yield for the ...
Friday, March 20, 2015 by Jena

chemistry
what is the strongest intermolecular force in nitrogen trifluoride
Friday, March 20, 2015 by emma

Chemistry
A solution is made by mixing 5.00 × 102 mL of 0.167 M NaOH with 5.00 × 102 mL of 0.100 M CH3COOH. Calculate the equilibrium concentrations of H+, CH3COOH, CH3COO−, OH−, and Na+.
Friday, March 20, 2015 by Sandhya

Chemistry
0.5g sample of bronze containing Zn is dissolved in 100ml of acid. An aliquot of 25ml requred 10.25ml of EDTA. What is the percentage of zinc in the bronze sample?
Friday, March 20, 2015 by Adedeji

Chemistry
1.) Explain the similarity between Mg(OH)2 and Zn(OH)2 in particular why would any insoluble hydroxide tend to dissolve in an acidic solution? Are they both bases? 2.) Explain the difference in particular how does Mg^+2 appear to form complex ions with OH^- and NH3? If these ...
Friday, March 20, 2015 by Gina

Chemistry
If 2.50 mol. of sodium chloride was required to make up a solution of a particular concentration, what mass would need to be measured out?
Friday, March 20, 2015 by Deanna

Chemistry
If you take 3 mLs of a solution that is 4M acetic acid and add enough water to it to make 50 mLs, what is the molarity of the final solution? Thank you!
Friday, March 20, 2015 by Artemis

Chemistry
If you measure 2.0 g of ethanol (CH3CH2OH) and add enough water to make 250 mLs (exact amount), what is the molarity of the ethanol in the final solution?
Friday, March 20, 2015 by Artemis

chemistry
A proton in a linear accelerator has a de Broglie wavelength of 138pm . What is the speed of the proton?
Friday, March 20, 2015 by kim

Chemistry
How do I determine the quantity (g) of pure MgSO4 in 2.4g of MgSO4.7H2O
Friday, March 20, 2015 by Debbie

chemistry
If you dissolve 3.5 moles of CaCl2 in a solution, how many moles of C+2 ions and C- ions will there be in the solution?
Friday, March 20, 2015 by Hannah

chemistry
Calculate the molar concentrations of all phosphate species in H3PO4 in a solution with pH = 2.25, given that the concentration of all four forms of phosphate total 15 mM.
Friday, March 20, 2015 by lawerence

Chemistry
Citric acid is a triprotic acid with Ka values of 3.14, 5.95, and 6.39. Estimate the pH of a 0.15 M solution of a monosodium salt
Friday, March 20, 2015 by lawerence

Chemistry
Suppose that a mixture of ice and water is placed in a refrigerator that is held at the freezing point of water, exactly 0.0C. Calculate deltaS for the ice-water mixture, deltaS for the refrigerator, and deltaStotal when 5.00g of ice forms. Is this process spontaneous? Is the ...
Friday, March 20, 2015 by Jenny

Chemistry- Electrochemistry
Calculate the activity of KI, x, in the following electrochemical cell if the potential is +0.294 V Ag | AgCl(s),NaCl(aq,0.1) ||KI(aq, x),I (s) | Pt
Friday, March 20, 2015 by Jessica

Chemistry
A balloon is filled with hydrogen at a temperature of 20 C and a pressure of 755 mmHg. If the balloons original volume was 1.05 liters, what will the new volume be at a higher altitude, where the pressure is only 625 mmHg? Assume the temperature stays the same.
Thursday, March 19, 2015 by Lillie

Chemistry
1. When adding the sodium borohydride solution to the vanillin solution, why are you told to do so in a dropwise fashion? -So you don't accidentally spill any sodium borohydride -To prevent formation of unwanted vanillin byproducts -to prevent formation of unwanted sodium ...
Thursday, March 19, 2015 by Ley

chemistry
To identify a diatomic gas (X2), a researcher carried out the following experiment: She weighed an empty 2.8-L bulb, then filled it with the gas at 1.20atm and 22.0 ∘C and weighed it again. The difference in mass was 3.9g . Identify the gas.
Thursday, March 19, 2015 by lisa

chemistry micelles
how does an electrolyte (KNO3) affect the formation of micelles?? I'm very unsure. Do they interact with the polar head?
Thursday, March 19, 2015 by pan

Chemistry
After being heated, an enzyme loses its ability to catalyze a reaction. What change occurred to the enzyme? A. A physical change, because cooling will restore the enzyme's function C. A physical change, because intermolecular forces were overcome
Thursday, March 19, 2015 by Cortney

Chemistry
Which argument supports the claim that dissolving solid calcium chloride (CaCl2) in water is a chemical change? A. The ionic bond between the calcium ions and chloride ions is broken. B. The solid calcium chloride can be recovered by evaporating the water. C. The ions present ...
Thursday, March 19, 2015 by Cortney

chemistry
LiF, BeF2, PCl3, CCl4, F2 1. which is likely to conduct electricity when aqueous: 2. which is most likely to be a gas in room temp. 3. which is likely to be very soluble in water 4. which is a polar molecule? may have more than one answer
Thursday, March 19, 2015 by annie

chemistry
As an ionic solid dissolves in water, the temperature of the solution increases. What best describes the enthalpy and entropy of the solution? A. The enthalpy change is negative, and the entropy decreases. B. The enthalpy change is negative, and the entropy increases. C. The ...
Thursday, March 19, 2015 by Cortney

chemistry
What is the strongest intermolecular force that occurs between methane (CH4) and ammonia (NH3)? A. Dipole-induced dipole attractions B. Hydrogen bond C. London dispersion forces D. Dipole-dipole forces Is that answer c?
Thursday, March 19, 2015 by Cortney

Chemistry
A. The molecules of water on the surface change bonding as they dry out. B. The density of the pin is less than that of the water's surface. C. The surface tension of the water is so low. D. The force exerted by the mass of the pin does not increase the surface area ...
Thursday, March 19, 2015 by Cortney

chemistry
I have to do a lab on equilibrium, where you have to transfer water with two different sized straws, and answer questions based on that the questions are about the significance of where there is a flat line on the graph, and the significance of the point where the two lines ...
Thursday, March 19, 2015 by alyssa

chemistry
what mass of carbon, in grams, can be consumed by 44 g oxygen in in combustion to give carbon monoxide/ what mass of CO is produced?
Thursday, March 19, 2015 by Aman

Chemistry
There's reaction involving gas: Fe + H2SO4 -> Fe2(SO4)3 + H2O + SO2 How Fe2(SO4)3 is occur? I know the "2" comes from the ion of SO4, but I don't know where the "3" comes up. Is the Fe2(SO4)3 comes up from half-reaction method? Is the reaction ...
Thursday, March 19, 2015 by Jeremy

Chemistry
1. Iron oxide and carbon monoxide react according to the following equation . Identify which reactant is limiting and which is excess if 43.5 grams of Fe2O3 reacts with 43.5 grams of CO Fe2O3 + 3CO2 --> 3CO2 + 2Fe 2. Calculate the percent yield of Carbon dioxide if 20.0 ...
Thursday, March 19, 2015 by Tiffany

Chemistry
I have to do a lab on equilibrium, where you have to transfer water with two different sized straws, and answer questions based on that the questions are about the significance of where there is a flat line on the graph, and the significance of the point where the two lines ...
Thursday, March 19, 2015 by Al

chemistry
Why is it possible to float a pin on the surface of water? A. The molecules of water on the surface change bonding as they dry out. B. The density of the pin is less than that of the water's surface. C. The surface tension of the water is so low. D. The force exerted by ...
Wednesday, March 18, 2015 by Cortney

chemistry
As an ionic solid dissolves in water, the temperature of the solution increases. What best describes the enthalpy and entropy of the solution? A. The enthalpy change is negative, and the entropy decreases. B. The enthalpy change is negative, and the entropy increases. C. The ...
Wednesday, March 18, 2015 by Cortney

Chemistry
______________ are similar to covalent bonds in that they hold atoms together. They are different from covalent bonds in that they ___________ . A. Ionic bonds; hold atoms together within a molecule B. Intermolecular forces; require less energy to break C. Intermolecular ...
Wednesday, March 18, 2015 by Cortney

chemistry
How do intermolecular forces determine the vapor pressure of a liquid? A. A nonpolar compound has a low vapor pressure because of London dispersion forces. B. A compound that can form hydrogen bonds has a low vapor pressure. C. A polar compound has a high vapor pressure ...
Wednesday, March 18, 2015 by Cortney

Chemistry
Which of the following statements is (or are) true? I. All polar molecules have dipole moments. II. All polar molecules have oppositely charged regions. III. A polar molecule is attracted to other molecules because of electrostatic forces. IV. All polar molecules have hydrogen...
Wednesday, March 18, 2015 by Cortney

chemistry
calculate how many moles of CaCl2•2H2O are present in 1.0 g of CaCl2•2H2O and then calculate how many moles of pure CaCl2 are present in the 1.0 g of CaCl2•2H2O
Wednesday, March 18, 2015 by she

chemistry
how many grams of hydrogen are produced if 22.1g of sodium hydroxide is produced
Wednesday, March 18, 2015 by ked

Chemistry
1. How many moles of ammonia NH3 are produced when 0.45 moles of nitrogen N2 reacts? N2 + 3H2 yields 2NH3 2. How many mililiters of water will be produced when 2.05 g of hydrogen reacts? The density of water is 1.00 g/mL ? 2H2 + O2 yields 2H2O 3. What is the limiting reactant ...
Wednesday, March 18, 2015 by Melanie

chemistry
A chemist heats a sample of copper(II) sulfate and finds that 63.9% of the mass is copper(II) sulfate and the other 36.1% by mass is the water. What is the formula of the hydrate?
Wednesday, March 18, 2015 by Grayson

Chemistry I
A bottle of vintage port wine has a volume of 750ml and contains 135ml ethanol. Ethanol has a density of 0.789g/ml. What is the molarity?
Wednesday, March 18, 2015 by Anonymous

Chemistry
What is the concentration of arsenate ions in 3.5 M solution of arsenic acid? The acid-dissociation constants of H3AsO4 are: Ka1 = 5.0 x 10-3 Ka2 = 9.3 x 10-8 Ka3 = 3.0 x 10-12 I can't figure out how to set up the question
Wednesday, March 18, 2015 by Kelly

Chemistry
Assuming that the lab procedure was conducted in an identical manner in all other respects, if a large quantity of vinegar had been taken initially for analysis, for example, a 50.0mL instead of 25.0 mL discuss briefly how each of the following would change. a. the moles of ...
Wednesday, March 18, 2015 by Linda

chemistry
A 8.60-g sample of solid CaSO4·2H2O was heated such that the water turned to steam and was driven off. Assuming ideal behavior, what volume would that steam occupy at 1.00 atm and 100.0 °C?
Wednesday, March 18, 2015 by Chad

rate law chemistry
hey so this is for rate law if the first step is the slow step. it is also an equilibrium. I just want to check if this is right. [Acetophenone]+[Ethoxide]<-k1--> k-1 [Intermediate]+[Ethanol] Just want to make sure this will be the rate law: k1/k-1 [Acetophone][Ethoxide...
Wednesday, March 18, 2015 by help me lol

Chemistry
A hot air balloon has a volume of 5.00x10^6 liters. Assuming a density of air of 1.293g/L at 25C and 1atm pressure, what temperature must the operator of the balloon achieve in order for the balloon to lift a 500.0kg payload? How do I set this up???????
Wednesday, March 18, 2015 by Emily

chemistry
1. What is the cause of a gas sample exerting pressure on its surroundings, such as a container? A. The sum of the volumes of all the gas particles in the sample B. Chemical reactions with the container walls C. Collisions of particles of gas D. The weight of the particles on ...
Wednesday, March 18, 2015 by Cortney

Chemistry
What is the molarity of an HNO3 solution if 24.1mL of a 0.250M Ba(OH)2 solution is needed to titrate a 15.0mL sample of the acid? Can you tell me the process to finding this answer?
Wednesday, March 18, 2015 by Holly

chemistry
The reaction below has an equilibrium constant of Kp=2.26×104 at 298 K. CO(g)+2H2(g)⇌CH3OH(g) Calculate Kp for the reaction below. 3CH3OH(g)⇌3CO(g)+6H2(g)
Wednesday, March 18, 2015 by jessicaCC

Chemistry
An unknown gaseous hydrocarbon contains 85.63 % carbon. If its density is 0.488 g/L at 0.355 atm and 100°C, what is the molecular formula of the gas? I can't figure this out. By assuming the total mass to be 100g, I get 85.63g C and 14.37g H which I then used to get ...
Wednesday, March 18, 2015 by Michael

chemistry
consider mixing 3.5L of co2 and 1.8L of h2o at 35C and 740mm Hg. determine the mass of the unbalanced reaction. CO2 + H2O = C4H10 + O2
Wednesday, March 18, 2015 by Kimmie

chemistry
How much energy is needed to completely remove an electron from n = 2 in a hydrogen atom?
Wednesday, March 18, 2015 by Anna

chemistry
A sample of ideal gas at room temperature occupies a volume of 32.0L at a pressure of 272torr . If the pressure changes to 1360torr , with no change in the temperature or moles of gas, what is the new volume, V 2 ?
Wednesday, March 18, 2015 by dakota

chemistry
High-pressure liquid chromatography (HPLC) is a method used in chemistry and biochemistry to purify chemical substances. The pressures used in this procedure range from around 500 kilopascals (500,000 Pa ) to about 60,000 kPa (60,000,000 Pa ). It is often convenient to know ...
Wednesday, March 18, 2015 by dakota

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