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December 20, 2014

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

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Chemistry
Balance the following equation in basic conditions CoCl2 (s) +Na2O2 (ag) ----> Co(OH)3 (ag)+Cl- (ag) + Na+ (ag)
Friday, November 21, 2014 at 10:56pm

Chemistry
A 3.78 g sample of ethanol (C2H5OH) was burned completely in a bomb calorimeter. The temperature of the calorimeter plus the contents increased from 25.6oC to 35.2oC. Knowing that ethanol's heat of combustion is -3600 kJ/mol, calculate the total heat capacity ( in kJ/oC ).
Friday, November 21, 2014 at 10:35pm

Chemistry
A sample of toluene, C7H8 has a mass of 74.5 g. How many moles of benzene does it contain? How many molecules does the sample contain? How many carbon atoms does it contain?
Friday, November 21, 2014 at 9:46pm

Chemistry
A sample of sodium sulfate, Li2SO4, contains 6.78 x 10^23 formula units. How many moles of Li2SO4 are there in the sample? How many moles of Li+ ions are there in the sample?
Friday, November 21, 2014 at 9:44pm

Chemistry
in a particular redox reaction, MnO2 is oxidized to MnO4– and fe3+ is reduced to fe2+. Complete and balance the equation for this reaction in acidic solution. Phases are optional.
Friday, November 21, 2014 at 5:22pm

Chemistry
when electricity is passed through water, the water decomposes into hydrogen gas and oxygen gas. when 10.00 kg of water were decomposed this way, 5788 l of oxygen gas were produced at 25 degrees celsius and 1 atm pressure. what is the percent yield of oxygen by volume?
Friday, November 21, 2014 at 3:23pm

chemistry
a mixture of 39.8g containing potassium chloride and potassium trioxochlorate (v) upon heating, the residue weighed 28.7g what is the percentage mass of potassium chloride in the residue?
Friday, November 21, 2014 at 1:31am

Chemistry/Physics
When 1mol of a gas burns at constant pressure, it produces 2430J of heat and does 5kJ of work. Calculate change in H, q, and in kJ?
Thursday, November 20, 2014 at 7:30pm

Chemistry/Physics
The kinetic energy of a rolling billiard ball is given by KE=1/2mv2. Suppose a 0.17-kg billiard ball is rolling down a pool table with an initial speed of 4.7m/s . As it travels, it loses some of its energy as heat. The ball slows down to 3.8m/s and then collides straight-on ...
Thursday, November 20, 2014 at 7:27pm

Chemistry
Use bond energy values to estimate delta H fro the following reaction in the gas phase: C2H4 + Br2 -> CH2BrCH2Br I am in dire need of help! Thank you
Thursday, November 20, 2014 at 7:15pm

chemistry
hydrogen gas reacts with oxygen gas to produce water if a student fills a 250-mL flask with hydrogen at STP, what volume of oxygen is necessary for the reaction?
Thursday, November 20, 2014 at 6:58pm

chemistry
One teaspoon of instant coffee ( 3 grams ) is dissolved in 250 grams of water. What percent of the resulting solution is coffee ?
Thursday, November 20, 2014 at 3:31pm

Chemistry
Can you tell if Beer's Law holds for your stock solutions as well as in the calibration range? Why or why not? (P.S. this is a lab question and Beer's Law equation is: A(absorbance) = a(absorptivity) x b(path length) x c(concentration))
Thursday, November 20, 2014 at 2:27pm

Chemistry
If 25.00 mL of 6.00 M HCl is transferred by pipet into a volumetric flask and diluted to 5.00 L, what is the molarity of the diluted HCl? a) 0.75 M b) 0.055 M c) 1.20 x 103 M d) 48.0 M e) 0.0300 M grams of solute/molar mass of solute/liters of solution?
Thursday, November 20, 2014 at 12:56pm

chemistry
what is the partial pressure of hydrogen in a flask containing 2g hydrogen and 32g sulphur dioxide
Thursday, November 20, 2014 at 11:48am

chemistry
The maximum allowable level of nitrate in drinking water set by the state of california is 45mg NO3/l.what is this level expressed in PPm
Thursday, November 20, 2014 at 9:40am

chemistry
If we dissolve 170g sodium acetate in 100g water at 100 degree centigrade , the solution will be saturated or supersaturated
Thursday, November 20, 2014 at 6:23am

Chemistry Numerical
The half life period of a radioactive element is 27.96 days. Calculate the time taken by a given sample to reduce to 1/8th of its initial activity
Thursday, November 20, 2014 at 6:00am

Chemistry
Calculate the time in which the activity of an element is reduced to 90% of its original value. The half-life period of the element is 1.4*10^10 years . Answer :- 2.13*10^9 years
Thursday, November 20, 2014 at 5:58am

chemistry
What voiume of 10.01mol/dm3 commerical H2SO4 is required to prepare 1dm3 of 2mol/dm3 H2SO4 acid solution?
Thursday, November 20, 2014 at 3:33am

chemistry
A 23.9 g piece of metal heated to 97.8 oC is placed in 52.4 g water at 21.9 oC. After the metal is added, the temperature of the water rises to 29.9 oC. Calculate the specific heat of the metal. Express your answer in the units of cal/goC.
Thursday, November 20, 2014 at 1:10am

Chemistry
original question on 11/19 @ 2:26 am current question page 4, close to the bottom.
Thursday, November 20, 2014 at 12:40am

Chemistry
Given a 1.00 M solution of NaOH, describe how you would prepare 500 mL of 0.05 M NaOH solution. You have a 500 mL volumetric flask and a graduated cylinder. I have been trying to figure this question out for over an hour now. I cant seem to place the given numbers into any ...
Thursday, November 20, 2014 at 12:22am

Chemistry
Can you check my answer for the PH question @12:04 11/20?
Thursday, November 20, 2014 at 12:15am

Chemistry
A beaker contains a solution that is 0.50 M in Au+3 ion and 0.25 M in Ag+ ion. A soultion of sodium chloride is slowly dripped into the beaker with stirring. Which ion will precipitate first, the gold or the silver? Clearly support your answer and write out your final ...
Wednesday, November 19, 2014 at 11:57pm

Chemistry
can you look at the additional attached questions from me this morning at 2:29am? not fully understanding them. thanks for your help
Wednesday, November 19, 2014 at 11:25pm

Chemistry
Calculate the molar H3O and ClO3 concentrations of a .28 M solution of perchloric acid (HClO3)?
Wednesday, November 19, 2014 at 10:59pm

Chemistry
Calculate the mass of NH4NO3 salt that should be combined with 100.0 mL of water to obtain a temperature decrease of exactly –15.0C? Delta H of the solution = 24.13 Ccal = 21.12 Csh2o = 4.18 average Qrxn = 1151.6 I dont understand how to solve it
Wednesday, November 19, 2014 at 10:59pm

Chemistry
C2H5NO2 + 2H2O → 2CO2 + NH3 + 3H2 You begin with 1.25 × 10-2 moles of glycine and an excess amount of water that will allow the reaction to proceed completely to products. This is all in a vessel with a volume of 850 mls at 27°C. Assume that the vessel begins ...
Wednesday, November 19, 2014 at 10:32pm

chemistry
Find the percentage of water in Na2CO3*2H2O?
Wednesday, November 19, 2014 at 10:24pm

chemistry
9.03 of Mg combine completely with 3.48g of N to form compound. what is the percent composition of each element in this compound?
Wednesday, November 19, 2014 at 10:23pm

chemistry
29.0g Ag combine completely with 4.30g S to form a compound. what is the percent composition of each element in this compound
Wednesday, November 19, 2014 at 10:20pm

AP chemistry
How do you balance ZnCO3 +O2 yields ZnO + CO2?
Wednesday, November 19, 2014 at 9:32pm

chemistry
An ethylene glycol solution contains 18.2g of ethylene glycol (C2H6O2) in 85.4mL of water. Calculate the freezing point and boiling point of the solution. (Assume a density of 1.00 g/mL for water.)
Wednesday, November 19, 2014 at 8:37pm

chemistry
Calculate the freezing point of a water solution at each concentration. 1.40m? What are the steps to calculate this?
Wednesday, November 19, 2014 at 8:36pm

Chemistry
suppose you added 26.0 ml of 0.01 M NaOH to the solution, what is the molarity of excess NaOH in the mixture? what is the ph of this solution?
Wednesday, November 19, 2014 at 8:29pm

Chemistry: Sigma & Pi bonds
How many sigma bonds and pi bonds are there in each of the following: CH2Cl2 C2H3Cl C5H6 C6N4
Wednesday, November 19, 2014 at 7:07pm

chemistry
10.0 mL of a Cu2+ solution of unknown concentration was placed in a 250 mL Erlenmeyer flask. An excess of KI solution was added. Indicator was added and the solution was diluted with H2O to a total volume of 75 mL. The solution was titrated with 0.20 M Na2S2O3. The equivalence...
Wednesday, November 19, 2014 at 6:49pm

chemistry
What is the molarity of ZnCl2(aq) that forms when 18.0g of zinc completely reacts with CuCl2(aq) according to the following reaction? (Assume a final volume of 165mL .) Zn(s)+CuCl2(aq)→ZnCl2(aq)+Cu(s)
Wednesday, November 19, 2014 at 6:33pm

chemistry
Benzene is a carcinogenic (cancer-causing) compound. A benzene-contaminated water sample contains 3.1×10−5% benzene by mass. What volume of the water in liters contains 225mg of benzene? (Assume that the density of the solution is 1.0 g/mL.)
Wednesday, November 19, 2014 at 6:20pm

chemistry
How many total atoms are in the chemical formula Ai(NO3)3? I thought it was ten because Ai is 1 atom. The No3 is 3 atoms times the 3 is 9 plus the 1 is ten.
Wednesday, November 19, 2014 at 5:24pm

Chemistry
What is the maximum number of orbitals in an atom that can have the following designations? (a) 5p (b) 2pz (c) n=4
Wednesday, November 19, 2014 at 3:35pm

Chemistry
Give the maximum number of electrons in an atom that can have the following set of quantum numbers. (a) n=4 (b) n = 5, ml = 1, (c) n = 5, ms = 1/2
Wednesday, November 19, 2014 at 3:34pm

Chemistry
The ionization energy of Fe is 434 kJ/mol. What is the maximum wavelength of light capable of ionizing Fe? What type of light is this?
Wednesday, November 19, 2014 at 3:33pm

Chemistry
Consider the Li2+ ion. (a) Calculate the wavelength of light emitted when the electron jumps from the n=4 level to the n=2 level. (b) What is the ionization energy of Li2+ ?
Wednesday, November 19, 2014 at 3:32pm

Chemistry
While I3- and Br3- are both stable molecules F3- is not a stable molecule. Provide an explanation.
Wednesday, November 19, 2014 at 3:30pm

Chemistry
Which of the following sets of quantum numbers could possibly describe an electron in the ground-state configurations of beryllium. Choose all that apply (e.g. AB, ABC, ABDF). A) n=1 l=0 ml=0 ms=1/2 B) n=3 l=1 ml=-1 ms=1/2 C) n=2 l=0 ml=0 ms=-1/2 D) n=2 l=1 ml=0 ms=1/2 E) n=3 ...
Wednesday, November 19, 2014 at 3:17pm

Chemistry
Microwave ovens heat food by creating microwave electromagnetic radiation that is absorbed by water molecules in the food. Any material that does not have water in it will not absorb the radiation and will not get hot. Metals reflect the microwaves from their surfaces and ...
Wednesday, November 19, 2014 at 2:45pm

chemistry
4.) 105.4mL of Co2(g) was generated with a pressure of 765.5mm Hg for the gas. The temperature of the apparatus was 25.0C. How much zinc oxide would be left in tube if version A was the correct formula?
Wednesday, November 19, 2014 at 2:27pm

chemistry
1.) 1.25 moles of an ideal gas are contained in 8.0L. If the temperature is 33K, what is the volume at STP?
Wednesday, November 19, 2014 at 2:27pm

chemistry
2.) An ideal gas in a 6.30L container at 3.50 atm and at 273K is heated to 435.0K. What is the new pressure?
Wednesday, November 19, 2014 at 2:26pm

Chemistry
1. A combination reaction may also be a displacement reaction. True or False 2. The combustion of an element is always a combination reaction. True or False For number 1, I first thought true, but then again, nothing is being displaced in a combination reaction, right? You are...
Wednesday, November 19, 2014 at 1:30pm

chemistry
12.5g mass of the vinegar sample and the density of vinegar is 1.05g/mL determine the volume of the vinegar sample in liters?
Wednesday, November 19, 2014 at 12:27pm

Chemistry
I need help calculating Heat of fusion for a calorimeter experiment: I know that Q(melt): 8350.46 J, m(ice): 26.39g and m(hot water): 51.93g. Please help me set it up. Hf known is 6.02kj/mol. Answer is in J/g(ice).
Wednesday, November 19, 2014 at 12:18pm

chemistry
mass of dry crucible=34.69g mass of crucible with magnesium=34.68g mass of crucible with magnesium oxide =34.97g we did a lab and igot the mass for magnesium to be 0.17g and the mass for magnesium oxide to be 0.28g. how can i find the moles of magnesium and the number of ...
Wednesday, November 19, 2014 at 11:55am

chemistry
In the sun, nuclear fusion takes place. If the decrease in mass isa 0.006 50g, how much energy is released?
Wednesday, November 19, 2014 at 11:20am

chemistry
In a constant-pressure calorimeter, 55.0 mL of 0.310 M Ba(OH)2 was added to 55.0 mL of 0.620 M HCl. The reaction caused the temperature of the solution to rise from 22.23 °C to 26.45 °C. If the solution has the same density and specific heat as water, what is ΔH ...
Wednesday, November 19, 2014 at 11:09am

chemistry
the formula weight of h2so4 is 98. the weight of the acid in 400ml of 0.1M so the solution is?
Wednesday, November 19, 2014 at 10:22am

chemistry
You measure Ksp for borax and find it to be 6.2 x 10-3 at 22.8°C. If the standard enthalpy change, ΔH°, for the dissolution of borax is 58 kJ, calculate the standard entropy change, ΔS°, (in J/K) for the dissolution of borax at this temperature. (Assume...
Wednesday, November 19, 2014 at 9:09am

chemistry
You measure Ksp for borax to be 7.8 x 10-3 and 2.9 x 10-3 at 23.6°C and 1.8°C, respectively. Calculate the standard enthalpy change, ΔH°, (in kJ) for the dissolution of borax.
Wednesday, November 19, 2014 at 9:07am

chemistry
THE FREEZING POINT OF BLOOD SERUM IS ABOUT 0.56 DEGREE CELSIUS WHAT IS ITS OSMOTIC PRESSURE
Wednesday, November 19, 2014 at 8:19am

Chemistry
The ion-product of pure water, Kw, is 2.51 * 10(-14) at the body temp of 37 degrees Celcius. What are the molar H2O and OH concentrations in the pure water temperature?
Wednesday, November 19, 2014 at 2:29am

Chemistry
What is the PH of an aqueous solution consisting of 0.070 M formic acid (HCOOH) and 0.070 M sodium formate (HCOONa)?
Wednesday, November 19, 2014 at 2:26am

Chemistry
Calculate enthalpy change when 35.0 grams barium oxide reacts with 5.00 grams of aluminum. 0.228 mol BaO ( limiting reagent) 0.1853 mol Al Molar Ratio 1.23 -1669.8 - 3(-558.1) = 3344.1 kJ/mol 0.228 BaO reacts therefore: (0.228/3) x 3344.1 = 254.2 kJ
Wednesday, November 19, 2014 at 12:53am

Chemistry
1) A quantity of 85 mL of .900 M HCl is mixed with 85 mL of .900 M KOH in a constant-pressure calorimeter that has a heat capacity of 325 J/C. If the initial temperatures of both solutions are the same at 18.24 degrees C, what is the final temperature of the mixed solution? 2...
Tuesday, November 18, 2014 at 11:26pm

chemistry
if 10.5 moles of CH4 react with oxygen, what is the volume of CO2 (in liters) produced at 20.9 degrees celsius and 0.951 atm?
Tuesday, November 18, 2014 at 11:11pm

Chemistry
1) A 0.1375-g sample of solid magnesium is burned in a constant-volume bomb calorimeter that has a heat capacity of 3024 J/C. The temperature increases by 1.126 degrees C. Calculate the heat given off by the burning Mg, in kJ/g and kJ/mol. 2) Determine the amount of heat in kJ...
Tuesday, November 18, 2014 at 11:07pm

Chemistry
1) Determine the amount of heat in kJ given off when 1.26 x 10^4 g of NO2 are produced according to the equation: 2NO (g) + O2 (g) --> 2NO2 (g) and delta (H) = 483.6 kJ/mol 2) A sheet of gold weighing 10 g and at a temperature of 18 degrees C is placed on a flat sheet of ...
Tuesday, November 18, 2014 at 10:54pm

Chemistry
The Ksp values of BaSO4 and SrSO4 are 1.1x10^-10 and 3.8x10^-7 respectively. Calculate the concentrations of Ba2+, Sr2+, and SO4 2- in a solution that is saturated with BaSO4 and SrSO4.
Tuesday, November 18, 2014 at 10:07pm

chemistry
Find the pH of 1.0 x10-8 M KOH solution I tried to find it but i got 6 and thats acidic not basic.
Tuesday, November 18, 2014 at 9:49pm

chemistry
3. After removing membranes from an eggshell, the shell is dried and its mass is recorded as 5.613 g. The egg is transferred to a 250 mL beaker and dissolved in 25 mL of 6 M HCL. After filtering, the solution containing the dissolved eggshell is diluted to 250 mL in a ...
Tuesday, November 18, 2014 at 9:46pm

Chemistry Lab
In chemistry we are doing a lab that involves crucibles and Mg ribbon, we have three days to complete the lab. Anyways do you think it would be alright to substitute the mass of the crucible we had the first day with the mass of the crucible we had today? We know how much the ...
Tuesday, November 18, 2014 at 9:42pm

chemistry
Experimentally the ionization energy of hydrogen is 1312.2 kJ / mol. What would be the wavelength (nm) of a photon with enough energy to ionize one atom of hydrogen? They give the equation E=hcR but those are all known constant values and none include mols so I'm very ...
Tuesday, November 18, 2014 at 9:22pm

chemistry
How do you find the total number of σ and π bonds in a molecule? Is there an equation?
Tuesday, November 18, 2014 at 9:13pm

Chemistry
If 2.00 mL of 0.600 M NaOH are added to 1.000 L of 0.850 M CaCl2, what is the value of the reaction quotient and will precipitation occur? I've been trying this problem over and over and haven't been able to get it. I know precipitation will not occur from my previous ...
Tuesday, November 18, 2014 at 8:56pm

Chemistry
If 2.00 mL of 0.600 M NaOH are added to 1.000 L of 0.850 M CaCl2, what is the value of the reaction quotient and will precipitation occur? I've been trying this problem over and over and haven't been able to get it. I know precipitation will not occur from my previous ...
Tuesday, November 18, 2014 at 8:24pm

chemistry
When given qcal (2064 J), how do you calculate delta H (which equation is used)? ex. CaO+ H2O-> Ca(OH)2, what is delta H?
Tuesday, November 18, 2014 at 7:25pm

chemistry
When 1.375g CaO is added to 50 mL water at 25.0 degree C, the temperature of the water increases to 34.6 degree C. Given the specific heat is 4.184 j/g*degree C, how much heat is absorbed by the calorimeter?
Tuesday, November 18, 2014 at 6:38pm

Chemistry
The unit cell of KCl is 6.31 Å on an edge. Find the density of KCl if there is 4 atoms of each element.
Tuesday, November 18, 2014 at 6:32pm

Chemistry 11
So I did a lab determining the chemical formula of a hydrate. We had to find the molecular formula of a hydrate of copper (2) sulphate, CuSO4 .xH2O. My observation table looks like this: Mass of clean, dry test tube: 21.6g Mass of test tube + hydrated copper (2) sulphate: 24.1...
Tuesday, November 18, 2014 at 6:27pm

chemistry
1. The combustion of acetylene is: 2 C2H2 + 5 O2  4 CO2 + 2 H2O ΔHo = -2511 kJ 11a. (5 pts) How much heat is produced if 85 g C2H2 is combusted with excess O2?
Tuesday, November 18, 2014 at 6:10pm

Chemistry
A 10.00 ml sample of vinegar, density 1.01g/ml, was diluted to 100.0ml volume. It was found that 25.0 ml of the diluted vinegar required 24.15ml of 0.0976 M NaOH to neutralize it. Calculate the strength of CH3COOH in terms of: a) molarity b) grams CH3COOH per litre c) % ...
Tuesday, November 18, 2014 at 5:58pm

chemistry
methane(g) +water= carbon monoxide(g)+Hydrogen (g) use the bond energies in the following table to predict the delta H foe the reaction
Tuesday, November 18, 2014 at 4:00pm

Chemistry
--> Consider the following hypothetical acid-base reaction. A(aq) + B(aq) + C(aq) + D(aq) WA WB SA SB A. The position of the equilibrium shifts from left to right B. The position of the equilibrium shifts from right to left C. The position of the equilibrium doesn’t ...
Tuesday, November 18, 2014 at 3:25pm

Chemistry, HELP!
1) If a soil had a pH of 5.5, how many milli-equivalents of acids would it have per 100 grams? 2) How many milli-equivalents of Ca need to be added to increase the pH of the soil to 6.8?
Tuesday, November 18, 2014 at 3:24pm

chemistry
why might consuming more of daily rni of a vitamin or mineral be harmful
Tuesday, November 18, 2014 at 12:05pm

Chemistry
A sample of oxygen at room temperature occupies a volume of 5.00x102 mL at 1.50 atm pressure. What pressure (in atm) must be applied to compress the gas to a volume of only 1.50x102 mL? Assume the temperature is constant.
Tuesday, November 18, 2014 at 11:06am

Chemistry
When 0.100 mol CaCO3(s) and 0.100 mol CaO(s) are placed in an evacuated sealed 10.0 L container and heated to 385 K, P(CO2) = 0.220 atm after equilibrium is established. CaCO3(s) <~> CaO(s) + CO2(g) 0.05 atm CO2(g) is then removed from the container. What is the total ...
Tuesday, November 18, 2014 at 9:56am

Chemistry
Are there any substances that are soapy and/or bitter in nature but are not bases/alkali?
Tuesday, November 18, 2014 at 4:03am

Chemistry
1. What happens if our calorimeter is not properly insulated..what effect will it have on our calculated specific heat capacity I.e too large, too small or no effect....explain. 2. If our partner forgot to cover the coffee cup calorimeter while the temperature was being ...
Tuesday, November 18, 2014 at 1:57am

Verifying-Chemistry related-Dr.Bob222
Hey Dr.Bob222, Pearlite is not ceramic material correct? Just need a second opinion. Thanks!
Tuesday, November 18, 2014 at 1:51am

chemistry
A 18.3 g piece of aluminum (which has a molar heat capacity of 24.03 J/oC mol) is heated to 82.4oC and dropped into a calorimeter containing water (specific heat capacity of water is 4.18 J/goC) initially at 22.3oC. The final temperature of the water is 24.9oC. Calculate the ...
Tuesday, November 18, 2014 at 1:24am

chemistry
What would the specific heat of graphite be? A 15.0g piece of graphite is heated to 100.0 degrees C and placed in calorimeter. The graphite releases 815.1 J of heat to reach a final temperature of 23.9 degrees C.
Tuesday, November 18, 2014 at 12:13am

chemistry
how are moles and molarity related to volume? is it molx molarity or mol/molarity to get volume?
Tuesday, November 18, 2014 at 12:03am

chemistry
The mass of solute per 100 mL of solution is abbreviated as (m/v). Mass is not technically the same thing as weight, but the abbreviation (w/v) is also common. How many grams of sucrose are needed to make 655 mL of a 36.0% (w/v) sucrose solution?
Monday, November 17, 2014 at 11:22pm

chemistry
What mass of precipitate will form if 1.50 L of concentrated Pb(ClO3)2 is mixed with 0.150 L of 0.190 M NaI? Assume the reaction goes to completion.
Monday, November 17, 2014 at 10:52pm

Chemistry
At a given temperature, a first-order reaction has a rate constant of 3.5 ´ 10–3 s–1. How long will it take for the reaction to be 24% complete? A chemical reaction that is first-order in X is observed to have a rate constant of 2.20 ´ 10–2 s–1...
Monday, November 17, 2014 at 9:43pm

Chemistry- URGENT please HELP
NH4NO3(s)+H2O(l)→NH4NO3(aq) ΔH = +25.7 kJ. What is the final temperature in a squeezed cold pack that contains 49.0g of NH4NO3 dissolved in 125 mL of water? Assume a specific heat of 4.18J/(g⋅∘C) for the solution, an initial temperature of 28.5∘C, ...
Monday, November 17, 2014 at 9:12pm

chemistry
how many liters of gaseous hydrogen bromide at 97 degrees c and 0.953 atm will a chemist need if she wishes to prepare 3.50 L of 1.20 M hydrobromic acid?
Monday, November 17, 2014 at 8:02pm

Chemistry
In an aqueous solution the [OH–] is 2.0 x 10–6 M. What is the [H3O+]? Question 17 options: 1.0 x 10–7 M 2.0 x 10–6 M 1.0 x 10–8 M 5.0 x 10–9M
Monday, November 17, 2014 at 7:40pm

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