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November 24, 2014

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

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Chemistry
The protective action of ozone in the atmosphere comes through ozone's absorption of UV radiation in the 230 to 290 nm wavelength range. What is the energy, in kilojoules per mole, associated with radiation in the wavelength range?
Tuesday, October 22, 2013 at 11:41am

college chemistry
exactly 11.2 ml of water at 23°c are added to a hot iron skillet. all of the water is converted into steam at 100°c. the mass of the pan is 1.5 kg and the molar heat capacity of iron is 25.19 j/(m·°c). what is the temperature change of the skillet
Tuesday, October 22, 2013 at 1:14am

Chemistry
Help! If I have 0.0031 absorbance/sec, how would I convert this to absorbance/minute? Thanks
Tuesday, October 22, 2013 at 1:06am

Chemistry
What does a change in the color of precipitate over time when a mixture of two solutions is combined with a reagent indicate?
Tuesday, October 22, 2013 at 12:23am

Chemistry
what is the resultig pH if 0.005 mol of NaOH is added to 100.0mL of buffer containing 0.010 mol acetic acid (CH3COOH,pKa = 4.74)and 0.010 mol sodium acetate (NaCH3COO)? (Assume the final volume is 100 mL) So i worked it out, i just need to double check the pH. Let me know what...
Tuesday, October 22, 2013 at 12:05am

Chemistry...
What volume of 0.400 M Hg(NO3)2 is needed to precipitate all the I- ions from 250.0 mL of 0.300 M FeI3? Is the answer 93.8mL??
Tuesday, October 22, 2013 at 12:02am

chemistry
A tuning fork produces a sound of musical note middle C. It moves back and forth 256 time each second. what is the frequency of the tuning fork?
Monday, October 21, 2013 at 11:53pm

chemistry
a tuning fork produces a sound of musical note middle C. It moves back and forth 256 time each second. What is the frequency of the tuning fork?
Monday, October 21, 2013 at 10:06pm

chemistry
balance the following ionic equation: Sn(2+)(aq)+ Mn(2+)(aq)----- Mn(5+)(aq)+ Sn (s)
Monday, October 21, 2013 at 7:09pm

Chemistry
The energy (in joules) of an electron energy level in the Bohr atom is given by the expression: En = -2.179E-18/n2 J where n is the quantum number that specifies the energy level. What is the frequency in Hz of the radiation emitted when an electron falls from level n = 3 to ...
Monday, October 21, 2013 at 7:05pm

Chemistry
What kind of reaction is this (redox, precipitation, acid-base, or complex ion formation reaction)? 1. 3 Ca(s) + 2 Al^3+(aq) -> 3 Ca^2+(aq) + 2 Al(s) 2. LiHCO3(s) + heat -> Li2CO3(s) + CO2(g) + H2O(g) Complete the reaction: Ni(s) + 2 Na^+(aq) -> ?
Monday, October 21, 2013 at 7:04pm

Chemistry
The energy (in joules) of an electron energy level in the Bohr atom is given by the expression: En = -2.179 x 10-18/n2 J where n is the principal quantum number for the energy level. What is the frequency in Hz of the electromagnetic radiation absorbed when an electron is ...
Monday, October 21, 2013 at 7:00pm

chemistry
When a photon of light hits the surface of a metal, a photoelectron may be emitted. Some of the photon's energy is required to free the electron from the surface. The remaining energy becomes the kinetic energy of the photoelectron. The minimum energy for the emission of ...
Monday, October 21, 2013 at 6:59pm

Chemistry
When 1.00 kg lead (specific heat = 0.13 J g -1 C -) at 100.0 C is added to a quantity of water at 28.5C, the final temperature of the lead-water mixture is 35.2 C. What is the mass of water present?
Monday, October 21, 2013 at 4:39pm

CHEMISTRY
The concentration of Pb2+ in a sample of wastewater is to be determined by using gravimetric analysis. To a 100.0-mL sample of the wastewater is added an excess of sodium carbonate, forming the insoluble lead (II) carbonate (267.2092 g/mol) according to the balanced equation ...
Monday, October 21, 2013 at 4:21pm

CHEMISTRY
The concentration of Pb2+ in a sample of wastewater is to be determined by using gravimetric analysis. To a 100.0-mL sample of the wastewater is added an excess of sodium carbonate, forming the insoluble lead (II) carbonate (267.2092 g/mol) according to the balanced equation ...
Monday, October 21, 2013 at 4:21pm

CHEMISTRY
The concentration of Pb2+ in a sample of wastewater is to be determined by using gravimetric analysis. To a 100.0-mL sample of the wastewater is added an excess of sodium carbonate, forming the insoluble lead (II) carbonate (267.2092 g/mol) according to the balanced equation ...
Monday, October 21, 2013 at 4:16pm

Chemistry
How much heat, in kilojoules (kJ), is required to raise the temperature of 2.50kg Hg(l) from -20.0 to -6.0C? Assume a density of 13.6g/ml and a molar heat capacity of 28.0 J mol -1 C -1 for Hg(l). Please helpppppp .... thanks in advance
Monday, October 21, 2013 at 4:05pm

chemistry
Al(NO3)3+ NaCl
Monday, October 21, 2013 at 3:24pm

Science, Chemistry
A cylinder containing 11.0L of helium gas at a pressure of 165atm is to be used to fill birthday balloons to a volume of 2.50L per balloon and at a pressure of 1.10atm. What is the maximum number of balloons that can be inflated at a constant temperature? (remember that 11.0L ...
Monday, October 21, 2013 at 2:48pm

chemistry
oxidation of 1,methyl-propanone with the presence of KMnO4 & conc H2SO4 under heat.
Monday, October 21, 2013 at 11:37am

chemistry
n an experiment, Ann mixes concentrated sulfuric acid with water in a reaction test tube. The walls of the test tube turn hot. What type of reaction has occurred?
Monday, October 21, 2013 at 10:19am

chemistry
If 2.0 Grams of anhydrous sodium sulfate are mixed with 2.0 grams of calcium chloride dihydrate and 2.0 grams of calcium sulfate dihydrate are collected, what is the percent yield? DO NOT ROUND A NUMBER IF USED IN A SUBSEQUENT CALCULATION
Monday, October 21, 2013 at 1:40am

Chemistry
Hi, I'm doing a chem lab of the Percent Composition of Potassium Chlorate-A Gas Law Experiment and we need to calculate the percent of KClO3 in the sample volumetrically and gravimetrically. I need help calculating the Volumetric percent of KClO3 in sample given the ...
Sunday, October 20, 2013 at 11:43pm

Chemistry
The element boron has three naturally occuring isotopes. One has the atomic mass 10.0129(54.4%), another 11.0093(12.75%). What is the atomic mass of the third isotope if the average atomic mass of boron is 10.811?
Sunday, October 20, 2013 at 11:27pm

Organic Chemistry lab
So we did a preparation of t-pentyl Chloride experiment in class the other day using t-pentyl alcohol, HCL, Aqueous sodium Bicarbonate, and calcium chloride as the drying agent. Little confused on a few of these questions Why is calcium chloride used as the drying agent ...
Sunday, October 20, 2013 at 11:19pm

Organic Chemistry
So we did a preparation of t-pentyl Chloride experiment in class the other day using t-pentyl alcohol, HCL, Aqueous sodium Bicarbonate, and calcium chloride as the drying agent. Little confused on a few of these questions Aqueous sodium bicarbonate was used to wash the crude t...
Sunday, October 20, 2013 at 11:16pm

CHEMISTRY
25cm^3 of a solution of NaOH required 28cm^3 of 1.0 mol dm^-3 H2SO4 to neutralise it. a)Write an equation for the reaction. b)How many moles of H2SO4 were needed? c)How many moles of NaOH were thus neutralised? d)How many moles of NaOH are there in 25cm^3 of solution?
Sunday, October 20, 2013 at 10:51pm

chemistry
DrBob222 - it says my answer should be a number.
Sunday, October 20, 2013 at 10:50pm

chemistry
2.4g of a compound of carbon, hydrogen and oxygen gave on combustion, 3.52g of CO2 and 1.44g of H2O. The relative molecular mass of the compound was found to be 60. a)What are the masses of carbon, hydrogen and oxygen in 2.4g of the compound? b)What are the emperical and ...
Sunday, October 20, 2013 at 10:39pm

Chemistry
50.0mL of 1.04moles HA is added to 50.0mL if 0.90moles NH4OH.With a 1:1 stoichiometric ratio. What is the limiting reactant in moles of this reaction.
Sunday, October 20, 2013 at 10:38pm

chemistry
2.4g of a compound of carbon, hydrogen and oxygen gave on combustion, 3.52g of CO2 and 1.44g of H2O. The relative molecular mass of the compound was found to be 60. a)What are the masses of carbon, hydrogen and oxygen in 2.4g of the compound? b)What are the emperical and ...
Sunday, October 20, 2013 at 10:05pm

chemistry
how many grams of oxygen is needed to burn 500 grams of pentane?
Sunday, October 20, 2013 at 10:03pm

Chemistry
When CuCl2 and NH4OH are combined what is the product formed?
Sunday, October 20, 2013 at 9:50pm

Chemistry
When CuCl2 and NH4OH are combined what is the product formed?
Sunday, October 20, 2013 at 9:50pm

Chemistry
When CuCl2 and NH4OH are combined what is the product formed?
Sunday, October 20, 2013 at 9:47pm

chemistry
2.0 grams of Anhydrous sodium are mixed with 2.0 grams of calcium chloride dihydrate and 2.0 grams of calcium sulfate dihydrate are collected what is the percent yield. DO not round a number if used in a subsequent calculation
Sunday, October 20, 2013 at 9:39pm

Chemistry
would the calculated molar volume be larger, smaller or unchanged. a. the partial pressure of water was not taken into account
Sunday, October 20, 2013 at 9:38pm

Chemistry
Is my answer in 3 sig fig or 4 sig fig?? A solution is prepared by dissolving 12.80 g of magnesium chlorite in enough water to make 200.0 mL of stock solution. A 25.0 mL aliquot (portion) of this stock solution is then removed and added to 250.0 mL of water. Calculate the ...
Sunday, October 20, 2013 at 8:21pm

chemistry
If 4.02 grams of a hydrate of magnesium sulfate loses 2.06 grams of water when heated, what is the formula for the hydrate
Sunday, October 20, 2013 at 7:34pm

Chemistry
For the diprotic weak acid H2A, Ka1 = 2.2 × 10-5 M and Ka2 = 7.8 × 10-7 M. What is the pH of a 0.0650 M solution of H2A? What are the equilibrium concentrations of H2A and A2– in this solution? Thank you for the help!!
Sunday, October 20, 2013 at 5:15pm

Chemistry
For the diprotic weak acid H2A, Ka1 = 2.2 × 10-5 M and Ka2 = 7.8 × 10-7 M. What is the pH of a 0.0650 M solution of H2A? What are the equilibrium concentrations of H2A and A2– in this solution? Thank you for the help!!
Sunday, October 20, 2013 at 5:15pm

Chemistry
For the diprotic weak acid H2A, Ka1 = 2.2 × 10-5 M and Ka2 = 7.8 × 10-7 M. What is the pH of a 0.0650 M solution of H2A? What are the equilibrium concentrations of H2A and A2– in this solution?
Sunday, October 20, 2013 at 5:15pm

Chemistry
For the diprotic weak acid H2A, Ka1 = 2.2 × 10-5 M and Ka2 = 7.8 × 10-7 M. What is the pH of a 0.0650 M solution of H2A? What are the equilibrium concentrations of H2A and A2– in this solution?
Sunday, October 20, 2013 at 5:15pm

Chemistry
For the diprotic weak acid H2A, Ka1 = 2.2 × 10-5 M and Ka2 = 7.8 × 10-7 M. What is the pH of a 0.0650 M solution of H2A? What are the equilibrium concentrations of H2A and A2– in this solution?
Sunday, October 20, 2013 at 5:15pm

Chemistry
For the diprotic weak acid H2A, Ka1 = 2.2 × 10-5 M and Ka2 = 7.8 × 10-7 M. What is the pH of a 0.0650 M solution of H2A? What are the equilibrium concentrations of H2A and A2– in this solution? Thank you for the help!!
Sunday, October 20, 2013 at 5:14pm

Chemistry
Even if you can help answer one that would be a great help! 1. How many liters of NO(g) are produced when 0.85L of 2.00M HNO3 solution is added to 216g according to the equation. Which reactant is the limiting reactant? 3 Ag + 4 HNO3 -> 3 AgNO3 + NO + 2 H2O3 2. Calculate ...
Sunday, October 20, 2013 at 5:06pm

Chemistry
Choose from the list the correct electron configurations for the following ions. A B C D E F G H I J K+ A B C D E F G H I J In+ A B C D E F G H I J Li+ A B C D E F G H I J Na+ A. 1s22s22p63s23p6 B. 1s22s22p63s23p64s23d104p64d105s25p1 C. 1s22s22p63s23p63d104s2 D. ...
Sunday, October 20, 2013 at 2:53pm

chemistry
A B C D E F G H 14Si A B C D E F G H 13Al A B C D E F G H 12Mg A B C D E F G H 4Be A B C D E F G H
Sunday, October 20, 2013 at 2:47pm

Chemistry
explain why glucose 1,6 bisphosphate would not be able to go through the aldolase reaction.
Sunday, October 20, 2013 at 2:01pm

chemistry
if air contains78% of nitrogen by volume what is the solubility nitrogen in water at 25 degree celcius?
Sunday, October 20, 2013 at 9:15am

Chemistry
Why is the copper/ sulfur mass ratio different from the mole ratio
Sunday, October 20, 2013 at 12:00am

chemistry
why is the copper/sulfur mass ratio different from the mole ratio?
Saturday, October 19, 2013 at 11:57pm

chemistry
if 2.0 grams of sodium sulfate are mixed with 2.0 grams of calcium chloride to produce calcium sulfate as a precipitate, which compound is the limiting reactant
Saturday, October 19, 2013 at 11:51pm

chemistry
5.34g of salt of formula M2SO4 (M is a metal)were dissolved in water. The sulfate ion was precipitated by adding excess barium chloride solution when 4.66g of barium sulfate (BaSO4) were obtained. a)How many moles of sulfate ion were precipitated as barium sulfate? b)How many ...
Saturday, October 19, 2013 at 10:56pm

CHEMISTRY
A garden fertilizer contains 15% by mass of nitrogen. The recommended usage is 30g of fertilizer per 10dm^3 of water. What is the concentration of nitrogen in this solution? a)0.15 g dm^-3 b)0.30 g dm^-3 c)0.45 g dm^-3 d)3.00 g dm^-3
Saturday, October 19, 2013 at 10:23pm

organic chemistry
I need help understanding how to differentiate between isomers and resonance structures in skeletal structures. Specifically, here is an image to a problem with the answers: i.imgur. com /mz3URSa.jpg (remove spaces) The left most structure is the reference structure and the ...
Saturday, October 19, 2013 at 10:20pm

chemistry
If the symbol X represents a central atom, Y represents outer atoms, and Z represents lone pairs on the central atom, the structure Y-:X:-Y could be abbreviated as XY2Z2. Classify these structures according to their shape. XY2Z,XY2Z2,XY2Z3,XY3Z,XY3Z2,XY4Z,XY4Z2,X​Y5Z The...
Saturday, October 19, 2013 at 9:17pm

Chemistry
If the symbol X represents a central atom, Y represents outer atoms, and Z represents lone pairs on the central atom, the structure Y-:X:-Y could be abbreviated as XY2Z2. Classify these structures according to their shape. XY2Z,XY2Z2,XY2Z3,XY3Z,XY3Z2,XY4Z,XY4Z2,X​Y5Z The...
Saturday, October 19, 2013 at 9:17pm

Chemistry
A solution of NaOH(aq) contains 5.2 g of NaOH(s) per 100.0 mL of solution. Calculate the pH and the pOH of the solution at 25 °C.
Saturday, October 19, 2013 at 8:25pm

Chemistry
A solution of NaOH(aq) contains 5.2 g of NaOH(s) per 100.0 mL of solution. Calculate the pH and the pOH of the solution at 25 °C.
Saturday, October 19, 2013 at 8:02pm

Chemistry
Explain using electron-pushing arguments why glycolysis must go through G6P to F6P step (C1 aldehyde to C1 ketone). Focus on the subsequent aldolase-catalysed reaction and explain why glucose 1,6 bisphosphate would not be able to go through the aldolase reaction.
Saturday, October 19, 2013 at 5:49pm

chemistry thermodynamics
a sample of methane gas of mass 25g at 250k and 18.8atm expands isothermally until its pressure is 2.5atm. calculate the change in entropy.
Saturday, October 19, 2013 at 5:20pm

Chemistry
A mixture of C3H8 and C2H2 has a mass of 2.3g . It is burned in excess O2 to form a mixture of water and carbon dioxide that contains 1.6 times as many moles of CO2 as of water. What is the mass of C2H2 in the original mixture?
Saturday, October 19, 2013 at 5:11pm

Chemistry
How many atoms of nitrogen are in the 25.0g of ammonia? Use the molar mass to two decimal places found on the periodic table in the front of your text?
Saturday, October 19, 2013 at 3:53pm

chemistry
Three solutions are mixed together to form a single solution. One contains 0.2 mol \rm mol Pb(CH 3 COO) 2 \rm Pb(CH_3COO)_2, the second contains 0.1 mol \rm mol Na 2 S \rm Na_2S, and the third contains 0.1 mol \rm mol CaCl 2 \rm CaCl_2. Write the precipitation reaction.
Saturday, October 19, 2013 at 11:55am

Chemistry
Explain using electron-pushing arguments why glycolysis must go through G6P to F6P step (C1 aldehyde to C1 ketone). Focus on the subsequent aldolase-catalysed reaction and explain why glucose 1,6 bisphosphate would not be able to go through the aldolase reaction.
Saturday, October 19, 2013 at 10:04am

Chemistry-Stoichiometry
what is the limiting reactant if 0.10 moles Fe and 0.16 moles O2 react according to the reaction 4Fe +3O2 -> 2Fe2O3?
Saturday, October 19, 2013 at 3:41am

Chemistry
The thermochemical equation for the combustion of hexane is shown below. 2 C6H14 (g) + 19 O2 (g) → 12 CO2 (g) + 14 H2O (g) ΔH° = –8326 kJ What is the enthalpy change for the combustion of 0.650 L C6H14 at STP?
Saturday, October 19, 2013 at 1:48am

chemistry
4 NH3(g) + 5 O2(g) → 4 NO(g) + 6 H2O(g) If a container were to have 16 molecules of NH3 and 16 molecules of O2 initially, how many total molecules (reactants plus products) would be present in the container after this reaction goes to completion? (Use only whole numbers ...
Saturday, October 19, 2013 at 12:52am

chemistry
2 C3H6(g) + 2 NH3(g) + 3 O2(g) → 2 C3H3N(g) + 6 H2O(g) a. What mass of acrylonitrile can be produced from a mixture of 1.24 kg of propylene (C3H6), 1.61 kg of ammonia, and 1.90 kg of oxygen, assuming 100% yield? b. What mass of water is produced?
Friday, October 18, 2013 at 11:30pm

Chemistry
Anhydrous aluminum oxide can be reduced to aluminum according to thisa chemical equation: 2 Al2O3 (s) ---> 4 Al (l) + 3 O2 (g) Calculate the mass of aluminum oxide reacted if 82 g of Al was produced and the percent yield was found to be 89.3%
Friday, October 18, 2013 at 9:10pm

Chemistry
What mass of copper(II) nitrate would be produced from the complete reaction of 65.3 g of copper, according to the chemical reaction shown below? Cu + 2 AgNO3 ----> Cu(NO3)2 + 2 Ag Use the masses to two decimal places using the periodic chart in the front of your text. ...
Friday, October 18, 2013 at 9:09pm

chemistry
a. How many atoms of hydrogen are in 25.0 g of ammonia (NH3)? Use the format 6.02E+23 for 6.02 x 1023 b. How many atoms of nitrogen are in the same amount of ammonia? Use the molar mass to two decimal places found on the periodic table in the front of your text.
Friday, October 18, 2013 at 9:07pm

CHEMISTRY
a solution of sodium hydroxide is standardized against potassium hydrogen phthalate (KHP, formula weight 204.2 g/mol). From the following data, calculate the molarity of the NaOH solution: mass of KHP 1.404 g; buret reading before titration 0.13 mL; buret reading after ...
Friday, October 18, 2013 at 7:32pm

chemistry 101
We add excess Na2CrO4 solution to 42.0 mL of a solution of silver nitrate (AgNO3) to form insoluble solid Ag2CrO4. When it has been dried and weighed, the mass of Ag2CrO4 is found to be 0.590 grams. What is the molarity of the AgNO3 solution? Answer in units of M
Friday, October 18, 2013 at 7:13pm

chemistry
What mass of Na2CrO4 is required to precipitate all of the silver ions from 71.0 mL of a 0.101 M solution of AgNO3?
Friday, October 18, 2013 at 5:15pm

chemistry
Calculate the sodium ion concentration when 71.8 mL of 3.2 M sodium carbonate is added to 33.6 mL of 3.7 M sodium bicarbonate.
Friday, October 18, 2013 at 5:06pm

chemistry
How would you prepare 2.25L of a 3.00M solution from a 15.0M stock solution?
Friday, October 18, 2013 at 4:01pm

CHEMISTRY
n 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 di- luted NaOH solution. Answer in units of M
Friday, October 18, 2013 at 1:38pm

Chemistry
A sample of bromine containing isotopes bromine-79 and bromine-81 was analyses in a mass spectrometer. How many peaks corresponding to Br^+ were recorded? A)1 B)2 C)3 D)4 How many peaks corresponding to Br2^+ Were recorded? A)1. B)2. C)3. D)4
Friday, October 18, 2013 at 12:45pm

chemistry
can somebody please tell me how to solve this, how can i find the saturation concentration of oxygen in water at 10'C in atmospheric pressure.?
Friday, October 18, 2013 at 5:15am

chemistry
Calculate the volume of oxygen you would need, at 1.00 atm \rm atm and 298 K \rm K, to completely oxidize 50g g of glucose
Friday, October 18, 2013 at 12:56am

chemistry
difference stoichiometric end point and end point in an acid-base titration
Friday, October 18, 2013 at 12:35am

chemistry
The left side of a balanced chemical equation is shown below: K2Cr2O7 + 4H2SO4 + 3SeO2 If 0.600 moles of K2Cr2O7, 2.800 moles of H2SO4 and 1.500 moles of SeO2 are brought together and allowed to react, then
Friday, October 18, 2013 at 12:20am

CHEMISTRY
1.) A solution is prepared by dissolving 5.00 g of stannic nitrate in enough water to make 250.0 mL of stock solution. A 15.0 mL aliquot (portion) of this stock solution is then removed and added to 75.0 mL of water. Calculate the concentrations of all ions in the final ...
Thursday, October 17, 2013 at 9:41pm

Chemistry
Vitamin K is involved in normal blood clotting. When 2.40 g of vitamin K is dissolved in 25.0 g of camphor, the freezing point of the solution is lowered by 8.05 °C. Calculate the molar mass of vitamin K. Kf value is 37.8 and the normal freezing point is 176 degrees C
Thursday, October 17, 2013 at 8:20pm

chemistry
How many grams of carbon dioxide are produced from 48.8 g of C4H10?
Thursday, October 17, 2013 at 7:30pm

CHEMISTRY plz help
In the accompanying chart are appropriate vapor pressures for benzene and toluene at various temperatures: Temp (C) mmHg Temp (C) mmHg Benzene 30 120 Toluene 30 37 40 180 40 60 50 270 50 95 60 390 60 140 70 550 70 200 80 760 80 290 90 1010 90 405 100 1340 100 560 110 760 d. ...
Thursday, October 17, 2013 at 7:20pm

Chemistry
PLEASE HELP!! 40 mL of 0.1 M solution of a weak acid (adjusted to a pH of 7.75) is titrated with 0.2 M HCl to a final pH of 2.1. Once the pH of the weak acid reaches 2.1, it is then titrated with 20 mL of 0.25 NaOH. What is the final pH of the solution? pKa values are 2, 6, ...
Thursday, October 17, 2013 at 7:17pm

CHEMISTRY
What is the name of 12H2O and 10 H2O?
Thursday, October 17, 2013 at 6:41pm

Chemistry
A sample of 1.018 g of KHP (potassium hydrogen phthalate, molar mass = 204.22 g/mol) was dissolved in ~ 25 mL distilled water and titrated with a NaOH solution of unknown concentration. If 28.69 mL of base was used to reach the endpoint, what was the concentration of the NaOH...
Thursday, October 17, 2013 at 5:13pm

Organic CHemistry Please help me out
In the accompanying chart are appropriate vapor pressures for benzene and toluene at various temperatures: Temp (C) mmHg Temp (C) mmHg Benzene 30 120 Toluene 30 37 40 180 40 60 50 270 50 95 60 390 60 140 70 550 70 200 80 760 80 290 90 1010 90 405 100 1340 100 560 110 760 d. ...
Thursday, October 17, 2013 at 4:52pm

chemistry
CaC2 + 2H2O = C2H2 + Ca(OH)2 If 40.0g of calcium carbide (CaC2) reacts with 25.0g of water, how many liters of acetylene (C2H2) can be produced, assuming the reaction goes to completion at 60F and 763 mmHg
Thursday, October 17, 2013 at 3:23pm

Chemistry
how do I do this problem 0.700 mol of Na2S in 1.55 of solution?
Thursday, October 17, 2013 at 12:56pm

Chemistry
What determines the greatest buffer capacity when looking at solutions? The professor said he would have a list of solutions on the test and we choose the one with the best buffer capacity
Thursday, October 17, 2013 at 11:22am

Chemistry. PLEASE HELP
a) To make an acid solution, 6.8 x 10-3 mole of a strong acid (6.8 x 10-3 mole H3O+) is dissolved in water to give a 550 mL solution. What is the pH and [OH-] of the solution? b) 150 mL of water is added to 50 mL of the solution produced in question 3. Calculate the new pH of ...
Thursday, October 17, 2013 at 9:37am

chemistry
Each of the following is placed in a dialyzing bag and the bag is then immersed in distilled water. Which substances will be found outside the bag? Check all that apply. NaCl solution albumin solution starch solution
Thursday, October 17, 2013 at 8:43am

Chemistry
a) To make an acid solution, 6.8 x 10-3 mole of a strong acid (6.8 x 10-3 mole H3O+) is dissolved in water to give a 550 mL solution. What is the pH and [OH-] of the solution? b) 150 mL of water is added to 50 mL of the solution produced in question 3. Calculate the new pH of ...
Thursday, October 17, 2013 at 2:02am

chemistry
150 mL of water is added to 50 mL of the solution produced in question 3. Calculate the new pH of the solution.
Thursday, October 17, 2013 at 1:09am

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