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October 24, 2014

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

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chemistry
Identify each of the ff reactions and say wha type of diving force for this.(a) chlorine+sodium iodin=2sodium chloride+iodin
Monday, September 29, 2014 at 11:01am

Organic Chemistry
A 0.160 M solution of an enantiomerically pure chiral compound D has an observed rotation of 0.20° in a 1-dm sample container. The molar mass of the compound is 128.0 g/mol. (a) What is the specific rotation of D? (b) What is the observed rotation if this solution is mixed...
Monday, September 29, 2014 at 10:13am

chemistry
A 36.1 mL sample of oxygen gas contains 0.529 mol of oxygen. If enough oxygen is added to the sample to obtain a volume of 50.5 mL, what must the final mass of the sample be? (The pressure and temperature is constant.)
Monday, September 29, 2014 at 3:02am

Chemistry II
Dr.Bob222 please help given the following table of thermodynamic data substance delta HofF S PCl3 -288.07 kJ/mol 311.7 J/mol-k PCl3 -319.6 kJ/mol 217 J/mol- k determine the normal boiling point (C)of PCl3
Monday, September 29, 2014 at 1:43am

Chemistry
What is the difference between Citric Acid C6H8O7 and H3C6H5O7? I am seeing both and don't know which is the right one. Is one a solution of citric acid? Thanks
Monday, September 29, 2014 at 1:02am

Chemistry
15.0 mL of 0.30 M sodium phosphate solution reacts with 20.0 mL of 0.23M lead(II) nitrate solution. What mass of precipitate will form?
Sunday, September 28, 2014 at 11:59pm

Chemistry
A 55.29-g sample of Ba(OH)2 is dissolved in enough water to make 1.20 L of solution. How many milliliters of this solution must be diluted with water in order to make 1.00 L of 0.100 M Ba(OH)2? (Ignore significant figures for this problem.)
Sunday, September 28, 2014 at 11:58pm

Chemistry
During recrystallization, an orange solution of a compound in hot alcohol was treated with activated carbon and then filtered through fluted paper. On cooling, the filtrate gave gray crystals, although the compound was reported to be colorless. Explain why the crystals were ...
Sunday, September 28, 2014 at 9:41pm

Chemistry
a 6 g sample of magnesium was burned in a crucible producing 10 g of magnesium oxide. What mass of oxygen reacted with magnesium to form the 10 g of magnesium oxide?
Sunday, September 28, 2014 at 9:10pm

chemistry
What volume of a 0.550 M solution of potassium hydroxide can be made with 18.3 g of potassium hydroxide? (Ignore significant figures for this problem.)
Sunday, September 28, 2014 at 9:04pm

Chemistry
What mass of ammonium nitrate is require to produce 145L of N2O at 2850 torr and 42 degree celcius
Sunday, September 28, 2014 at 7:34pm

chemistry
What is the molar concentration of all ions present in a solution prepared by mixing the following? Assume that volumes of the solutions are additive, and neglect H+ and OH- from water. 60.0 mL of 0.25 M KCl and 80.0 mL of 0.85 M NaOH.
Sunday, September 28, 2014 at 5:23pm

Chemistry
Aluminum sulfate reacts with calcium hydroxide (from lime) to form aluminum hydroxide and calcium sulfate. Write the balanced formula unit equation for the reaction.
Sunday, September 28, 2014 at 5:10pm

Chemistry
What is the mass of 3.01 x 10^22 iron (II) ions, Fe^2+?
Sunday, September 28, 2014 at 5:03pm

Chemistry
A .7178 g sample of a hydrocarbon occupies a volume of 390.7 mL at 65C and 99.2kpa. When the sample is burned in excess oxygen, 2.4267 g CO2 and .4967g H2O are obtained. What is the molecular formula of the hydrocarbon? Write a plausible structural formula for the molecule. ...
Sunday, September 28, 2014 at 3:51pm

chemistry
If He(g) has an average kinetic energy of 7590 J/mol under certain conditions, what is the root mean square speed of F2(g) molecules under the same conditions?
Sunday, September 28, 2014 at 3:47pm

chemistry
how many moles of oxygen are there in 50.0 grams of KClO3? Given: 50.0 g KClO3 Find: ? mol O K= 39.10 g/mol Cl= 35.45 g/mol O= (16.00)x3= 48.00 g/mol Total: 122.55 g/mol KClO3 50.0 g KClO3 x 1 mol KClO3/122.55 g/mol KClO3=0.408 mol KClO3 0.408 mol KClO3 x 3(oxygen)=1.22 moles O
Sunday, September 28, 2014 at 3:36pm

chemistry
A sample of unknown metal has a mass of 36.7 g. This metal was placed in boiling water at 96.0oC until the metal had reached the temperature of the water. The metal was then placed in a foam cup with 50.0 g of water in it at 20.0oC. The cup absorbs 42.0 J/oC, and the ...
Sunday, September 28, 2014 at 2:46pm

chemistry
Use Hess's Law and a table of heats of formation to determine the enthalpy for the following reaction. 3SO2(g) + 3H2O(g) + 3/2O2(g) --->3H2SO4(l) ΔH = ?
Sunday, September 28, 2014 at 2:32pm

chemistry
Use Hess's Law and a table of heats of formation to determine the enthalpy for the following reaction. 3SO2(g) + 3H2O(g) + 3/2O2(g) --->3H2SO4(l) ΔH = ?
Sunday, September 28, 2014 at 2:21pm

chemistry
heat lost by metal + heat gained by water = 0 [mass metal x specific heat metal x (Tfinal-Tinitial)] + [mass water x specific heat water x (Tfinal-Tinitial)] = 0 Substitute and solve for specific heat metal.
Sunday, September 28, 2014 at 2:16pm

chemistry
21.90 kJ/g x 0.1182 g = ?q = energy obtained by combusting salicylic acid. Then calculate the heat capacity of the calorimeter. That is q from above = C/degree c x 2.84 and solve for C, the heat capacity of the calorimeter. q = heat capacity x delta T q = Cfrom above x 3.50 ...
Sunday, September 28, 2014 at 2:15pm

chemistry
Balance following oxidation reduction reactions using oxidation states method? a) Cl2(g) + Al(s) --> Al3+(aq) + Cl- b.) O2(g) + H2O(l) + Pb(s) --> Pb(OH)2(s) c) H+(aq) + MnO4-(aq) + Fe2+(aq) --> Mn2+(aq) + Fe3+(aq) + H2O(l)
Sunday, September 28, 2014 at 12:55pm

Chemistry
2. The half-life of a radioactive element is important when considering its application in medicine. For example, iodine-131 is often used in the imaging of the thyroid. The reason is that iodine is readily absorbed by the thyroid gland. Another reason is the short half-life ...
Sunday, September 28, 2014 at 12:31pm

chemistry
A sample of gas occupies 17mL at -112 degrees Celsius. Assuming the pressure is held constant, what volume does the sample occupy at 70 degrees Celsius?
Sunday, September 28, 2014 at 12:03pm

Chemistry
Use half-cells to balance the following redox reaction, and label the oxidation and reduction half-reactions. Also, note that bromide is a spectator ion and can be eliminated. FeBr(aq) +Mg(s) = Fe(s) + MgBr2(aq) Fe^+2 -2e +Br^- e+ + Mg^+2 -2e =Fe^+2 -2e +MgBr2(aq) -2e e+ Idk ...
Sunday, September 28, 2014 at 11:32am

Chemistry
GE's light bulb division ordered 100.kg of tungsten for the filaments. If the tungsten comes in a cube what is the volume of the cube? What is the length of each side?
Sunday, September 28, 2014 at 8:43am

chemistry
The structure of tryptophan is shown at the right along with the pK values of the α-carboxyl and α-amino groups. (pK1=2.38; pK2=9.39) Tryptophan is a diprotic acid which can exist in three protonated forms: H2A , HA0, and A–. (HA0 consists primarily of the ...
Sunday, September 28, 2014 at 8:32am

chemistry
I what this question to be solve.what will be the pressure of 50cm^3 of oxygen gas in a piston initially at a pressure of 2atm when the volume was 500cm^3 at a steady temperature of 300k
Sunday, September 28, 2014 at 8:01am

Chemistry- colligative properties
Which of the following aqueous solution of equal molality has the lowest freezing point? a. H2SO3 b. NaCl c. NaOH d. Ca(NO3)2 How do you answer this without looking at their i values from textbooks? I know that delta(Fpt) = m * K,f * i and that i is approximately equal to the ...
Sunday, September 28, 2014 at 6:08am

Chemistry
A Power plant rated at 800 MegaWatts generates steam at 585 K and discards heat to a river at 295 K. If thermal efficiency of plant is 70% of maximum value, how much heat is discarded to river at rated power? Please help with steps on how to solve this one.
Sunday, September 28, 2014 at 6:03am

chemistry
If He(g) has an average kinetic energy of 7590 J/mol under certain conditions, what is the root mean square speed of F2(g) molecules under the same conditions?
Sunday, September 28, 2014 at 3:43am

chemistry
The complete combustion of salicylic acid releases 21.90 kJ of energy per gram of salicylic acid. In a particular bomb calorimeter (initially at room temperature), the combustion of 0.1182 g of salicylic acid, in the presence of excess oxygen, causes the temperature of the ...
Saturday, September 27, 2014 at 10:00pm

chemistry
Hydrogen gas produced by this reaction is typically collected via water displacement, during which time the hydrogen gas becomes saturated with water vapor. If 238.4 mL of gas with a total pressure 1.27 atm was collected via water displacement at 29.4 °C, what is the ...
Saturday, September 27, 2014 at 9:55pm

chemistry
30 ml of sample of unknown strong base is neutralized after the addition of 12 ml of a 0.150 M HNO3 solution if the unknown base concentration 0.0300 M give the possible identities for the unknown base
Saturday, September 27, 2014 at 9:47pm

Chemistry
If you dilute 14.0mL of the stock solution to a final volume of 0.350L , what will be the concentration of the diluted solution? Before it, there was a question: How many milliliters of a stock solution of 5.60 M HNO3 would you have to use to prepare 0.190L of 0.450 M HNO3? ...
Saturday, September 27, 2014 at 9:12pm

chemistry
an electron in n=5 emits 4052 nm to what energy level does the electron move
Saturday, September 27, 2014 at 8:11pm

chemistry
Imagine there is a tank of unknown gas that contains 53.31% carbon, 35.51% oxygen, and 11.18% hydrogen by mass. At 35.0 °C and 0.470 bar, 2.0 L of the gas has a mass of 3.3 g. Using this information, answer the following questions. a.) What is the empirical formula of the ...
Saturday, September 27, 2014 at 7:07pm

chemistry
A 8.50-g sample of solid AlCl3·6H2O 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?
Saturday, September 27, 2014 at 7:04pm

chemistry
Air is 78.1% nitrogen, 20.9% oxygen, and 0.934% argon by moles. What is the density of air at 22 °C and 760 torr? Assume ideal behavior.
Saturday, September 27, 2014 at 6:51pm

chemistry
A 8.80-g sample of solid SnCl2·2H2O 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?
Saturday, September 27, 2014 at 6:46pm

chemistry
Suppose 1.2x10^3 kg of C is mixed with 2.4x10^5g oxygen gas and carbon dioxide forms. 1. write the reaction and balance 2.which reactant is the limiting reagent and which reactant is in excess 3. How many grams of carbon dioxide will be formed.
Saturday, September 27, 2014 at 5:40pm

chemistry
2NiS2(s)+5O2(g)=2NiO(s)+4SO2(g) 1. how many kilograms of NiO would be formed from the reaction of .0125 mol of NiS2? 2. How many grams of O2 are needed to cmpletely react with 3.74 g of NiS2.
Saturday, September 27, 2014 at 5:38pm

Chemistry
500 g of Fe reacted with water to yield 4.2 g of H2. Fe3O4 was also produced in the reaction. What is the %yield of H2?
Saturday, September 27, 2014 at 4:47pm

chemistry
a student mixes 4 reagents together thinking that the solution will neutralize each other . The solution is mixed together are 50 ml of 0.100 M of HCL and 100 ml of 0,200 M of nitric acid 500 ml of 0.0100 M ca hydroxide and 200 ml of 0.100 M rubidium hydroxide . Did the acid ...
Saturday, September 27, 2014 at 3:41pm

chemistry
The half-life of oxygen-15 is 124 s. If a sample of oxygen-15 has an activity of 4800 Bq, how many minutes will elapse before it has an activity of 600 Bq?
Saturday, September 27, 2014 at 3:37pm

Chemistry
Please help! Calculate the standard change in enthalpy, ΔH°rxn, for the decomposition of calcium carbonate to calcium oxide CaCO3 (s) → CaO (s) + CO2 (g) Given that: ΔH°f CaCO3 (s) = -1206.9 kJ/mol ΔH°f CaO (s) = -635.1 kJ/mol ΔH°f CO2...
Saturday, September 27, 2014 at 3:20pm

Chemistry
Please help me! I don't know how to do this at all. Calculate the enthalpy for the reaction: NO (g) + O (g) → NO2 Given the following known reactions: NO(g)+O3 (g)→NO2 (g)+O2 (g) 03 (g)→1.5O2 (g) O2 (g)→2O(g) ΔH°=-198.9kJ ΔH°=-142....
Saturday, September 27, 2014 at 2:25pm

CHEMISTRY
Does a molecular compound in water have hydration or have ionization ?
Saturday, September 27, 2014 at 12:02pm

chemistry
in HNO3 titration, you add few drops of phenolphthalein indicator to 50.0 mL of acid in a flask. you quickly add 20.00 mL of 0.0547 M NaOH but overshoot the end point, and the solutions turn deep pink. instead of starting over, you add 30.00 mL of acid, and the solution turns ...
Saturday, September 27, 2014 at 6:53am

chemistry
If 70.0 mL of water is added to 30.0 mL of 0.400 M solution of NaOH, what is the new concentration of NaOH?
Saturday, September 27, 2014 at 4:25am

chemistry
A 4.78-g sample of aluminum completely reacts with oxygen to form 6.67 g of aluminum oxide Use this data to calculate the mass percent composition of aluminum in aluminum oxide. (Sorry need help with this!)
Saturday, September 27, 2014 at 3:07am

chemistry
Calculate the empirical formula for compound ethyl butyrate (pineapple oil): C, 62.04%; H, 10.41%; O, 27.55% Can someone show me the steps?
Saturday, September 27, 2014 at 2:17am

chemistry
230Th+He____223Po+2 2H+----- please complete this equation
Saturday, September 27, 2014 at 1:07am

chemistry
How do you calculate the mass percent composition of nitrogen in NO2?
Saturday, September 27, 2014 at 1:01am

chemistry
Determine the number of moles of H in 4.70mol H2O. Please help I tried different ways to do it and I got them all wrong.
Saturday, September 27, 2014 at 12:03am

Chemistry
In order to identify a compound using TLC it is necessary to spot a sample of the pure compound. Why is this necessary?
Friday, September 26, 2014 at 11:38pm

Organic chemistry
In order to identify a compound using TLC it is necessary to spot a sample of the pure compound. Why is this necessary?
Friday, September 26, 2014 at 11:36pm

Chemistry
What is the total ionic equation of this: 3CaCl2(aq) + 2K3PO4(aq) → Ca3(PO4)2(s) + 6KCl(aq) Shw all physical states of the reactants and products
Friday, September 26, 2014 at 11:17pm

Chemistry
Bones are mostly calcium phosphate. Calcium chloride reacts with potassium phosphate to form calcium phosphate and potassium chloride. Indicate the physical states or reactants and products a) Write the balanced equation of the information above b) Determine the total ionic ...
Friday, September 26, 2014 at 10:18pm

chemistry
An electrical heater delivers 4.070 kJ of energy (as heat) to a system consisting of the gas inside a cylinder having a movable piston. As a result, the piston moves against a constant external pressure such that P ∆V = 2.442 kJ. What is the change in internal energy for...
Friday, September 26, 2014 at 7:39pm

chemistry
Use the following values for the arrows in the drawing: a = 185 J of heat; b = 45 J of heat; c = 115 J of work; d = 40 J of work; e = 65 J of work; and f = 190 J of heat. Find the change in the internal energy of object A only. Use the First Law of Thermodynamics Be careful ...
Friday, September 26, 2014 at 5:02pm

Chemistry
Dalton discovered electrons inside of atoms by using thermal energy. Thompson discovered electrons inside of atoms by using cathode rays. Thompson discovered electrons inside of atoms by using X rays. Dalton discovered electrons inside of atoms by using cathode rays. Dalton ...
Friday, September 26, 2014 at 4:19pm

Chemistry of Life
Which statement is true about water molecules? The oxygen atom has a negative charge. The hydrogen atoms do not share electrons. Water molecules move randomly around each other. Water molecules cannot dissolve many substances. Question 2. How does water relate to the ability ...
Friday, September 26, 2014 at 4:13pm

Chemistry
A car moving in a straight line at an average speed of 55.0 mi/hr for 4.25 hr has traveled _____. 234 mi 15 mi 13 mi 220 mi
Friday, September 26, 2014 at 2:40pm

Chemistry
Doctors recommend that men get 11 g of zinc daily. How many moles of zinc are in 11 g? 0.20 moles 17 moles 1.70 moles 0.17 moles
Friday, September 26, 2014 at 2:26pm

CHEMISTRY
Give the IUPAC name foR CH2-CH-CH3 CH2-CH2-CH2 | | | | CL CL CL CL CL | CL CH3-C-CH3 | | CH-CH2-CH3 CL | CL
Friday, September 26, 2014 at 1:10pm

Chemistry
An aqueous solution of barium nitrate has a density of 1.09 g/cm3. The solution is 18.7% barium nitrate by mass. How many nitrate ions are present in 87.6 dL of this solution?
Friday, September 26, 2014 at 12:23pm

chemistry
Write the name of each of the following substituents CH 3 −CH 2 −
Friday, September 26, 2014 at 11:55am

Chemistry
My head is spinning from this chapter! I've done most of the questions by myself but I have no idea what formulas I should use for these last two. Can you walk me through them so I can understand what I need to do? 1. What volume of 5.0 M HNO3 is required to neutralize ...
Friday, September 26, 2014 at 2:07am

chemistry
how many ml of polyurethane and catalyst for the ratio of 7:1 if I have 30cm width,98cm lenghth and .2cm height?
Friday, September 26, 2014 at 12:36am

Chemistry
5.0 grams of solid Ce2(SO4)3 was added to 100 mL of water. What is the total mass?
Thursday, September 25, 2014 at 10:11pm

chemistry
Calculate how many grams of the first reactant are necessary to completely react with 55.8g of the second reactant. Na2CO3 + CuCl2 → CuCO3 + 2 NaCl
Thursday, September 25, 2014 at 9:47pm

Chemistry
Deduce the number of nitrogen atoms in: 5.00 x 10^-3 mol of ammonia, NH3 and 4.601 g of nitrogen dioxide, NO2
Thursday, September 25, 2014 at 9:32pm

Chemistry
Use solubility rules to write the balanced molecular, complete ionic, and net ionic equations for the aqueous reaction between BaI2 and Hg(NO3)2. Include phase subscripts on all substances. I got to the part where you switch the elements Ba(NO3)2 +HgI2 I don't know where ...
Thursday, September 25, 2014 at 9:17pm

chemistry
A 23.0-g sample of an unknown metal is heated to 91.5°C and is placed in a perfectly insulated container along with 102.g of water at an initial temperature of 21.80°C. After a short time the temperature of both the metal and water become equal at 23.80°C. The ...
Thursday, September 25, 2014 at 7:24pm

chemistry
The heat lost or gained by a system is related to its temperature change by a property called its heat capacity. The molar heat capacity of metals at or above room temperature equals 24.92 J/K.mol. The temperature of a block of lead (MM 207.2) was raised by 13.1 degrees when ...
Thursday, September 25, 2014 at 7:15pm

Chemistry
I've been trying to figure this problem out all day and I STILL don't know how to solve for the specific heat constant. I blank after I set up the problem. Somebody please help me!!! What is the specific heat constant if 621 g of Metal A raises the temperature of 500.0...
Thursday, September 25, 2014 at 7:12pm

chemistry
The complete combustion of salicylic acid releases 21.90 kJ of energy per gram of salicylic acid. In a particular bomb calorimeter (initially at room temperature), the combustion of 0.1182 g of salicylic acid, in the presence of excess oxygen, causes the temperature of the ...
Thursday, September 25, 2014 at 4:55pm

chemistry
The specific heat capacity of gold at 25°C is 1.290×10-1 J/g/K. For a 5.25×102 g sample of gold, how much will the temperature increase if 6.908×102 J of energy is put into the system? (Assume that the heat capacity is constant over this temperature range.)
Thursday, September 25, 2014 at 4:54pm

Chemistry
Anyone know how to go about the problem? I don't know how to do it. Assume a professor has a daily special request for her coffee. She likes to have the 250.0 mL of coffee frozen at -15.0°C overnight and then wants it heated to 95°C when she gets there in the ...
Thursday, September 25, 2014 at 4:26pm

Chemistry
Please help me! I do not know what to do. 500.0 g ethyl alcohol at 25°C (C = 2.46 J/g x °C) absorbs 74.0 J of heat energy. What is the final temperature? What is the specific heat constant if 621 g of Metal A raises the temperature of 500.0 g of water by 3.20°C and...
Thursday, September 25, 2014 at 4:07pm

Chemistry
I'm really confused about how to do these two problems. Please help me. What is the amount of heat (kJ) required if 64.0 kg of H2O is heated from 25°C to 85°C? 200.0 g Al (C = 0.900 J/g × °C) at 95°C is added to 85.4 g H2O at 25°C. What is the ...
Thursday, September 25, 2014 at 3:46pm

Chemistry
PLEASE help because I'm really confused on how to do the entire thing. I don't know how to find the mL. Am I suppose to do anything with the 250mL? A person stops in every day and orders 250 mL of house coffee at precisely 95°C. but enough milk at 10°C to drop ...
Thursday, September 25, 2014 at 2:34pm

Chemistry
The name given to the geometric arrangement of the reacting species at the time of reactions is called --------------------?
Thursday, September 25, 2014 at 12:50pm

Chemistry
Given: CH4 + 2O2 ~ CO2 + 2H2O C - H = 99 kcal O - O = 119 kcal C = O = 192 kcal O - H = 111 kcal Calculate the change in energy for the CH4 - O2 system.
Thursday, September 25, 2014 at 12:48pm

chemistry
caculate the number of moles of magnesium ions in 5.5g magnesium phosphate
Thursday, September 25, 2014 at 12:39pm

chemistry
The radius of a niobium atom is 131 pm. How many niobium atoms would have to be laid side by side to span a distance of 4.53 mm? atoms
Thursday, September 25, 2014 at 12:35pm

chemistry
If someone has the time to help with the following question it would be really helpful. The problem is 209/83bi+64/28NI=272/111Rg+1/0n How to calculate the energy change in J/mol reactants? AMU amounts: Bi=208.980384 Ni= 63.927969 Rg=272.1535 What I have done is 1. subtract ...
Thursday, September 25, 2014 at 12:25pm

chemistry
what mass of silver chloride can be prepared by the reaction of 100 ml 0,20 M of silver nitrate with 100,0 ml of 0.15 M calcium chloride calculate the concentration of each ion reamaining in solution after the precipitation is complete
Wednesday, September 24, 2014 at 11:44pm

ap chemistry
what mass of barium sulfate can be produced when 100 ml 0.100 M of solution of barium chloride is mixed with 100.0 ml of a 0.100 M solution of Iron (III) sulfate
Wednesday, September 24, 2014 at 11:26pm

ap chemistry
what volume 0,100M of Na2PO4 is required to precipatate all the lead(II) ions from 150 ml of 0.250M Pb(NO3)2
Wednesday, September 24, 2014 at 11:11pm

Chemistry
A scientist wants to make a solution of tribasic sodium phosphate, Na3PO4, for a laboratory experiment. How many grams of Na3PO4 will be needed to produce 400mL of a solution that has a concentration of Na+ ions of 1.10M ?
Wednesday, September 24, 2014 at 10:29pm

Chemistry
If a sample of silver carbonate contains 1.75 grams of silver [Ag] atoms, calculate the mass (in grams) it contains of oxygen atoms [O].
Wednesday, September 24, 2014 at 10:06pm

Chemistry
Four isotopes of Lead occur naturally: 204Pb (mass = 203.973037 amu) 206Pb (mass = 205.974455 amu) 207Pb (mass = 206.975885 amu) 208Pb (mass = 207.976641 amu) If the percent abundance of 204Pb and 208Pb are 1.400 and 52.40, respectively, what is the percent abundance of 206Pb...
Wednesday, September 24, 2014 at 10:05pm

Chemistry
Find the mass (in g) of Carbon in 2.980 g Carbon dioxide.
Wednesday, September 24, 2014 at 9:58pm

chemistry
How many grams of chlorine gas are needed to make 5.10 × 106 g of a solution that is 1.50 ppm chlorine by mass?
Wednesday, September 24, 2014 at 9:43pm

Chemistry
A 45kg sample of water absorbs 349kJ of heat. If the water was initially at 25.5 degrees Celsius, what is its final temperature?
Wednesday, September 24, 2014 at 8:59pm

Chemistry
In lab, we were finding the distribution coefficient for propanoic acid and ethyl acetate. As well as propanoic acid and toluene. How would you write the chemical equation for the reaction of propanoic acid and ethyl acetate? I know it produces water in the end...but I am not ...
Wednesday, September 24, 2014 at 8:28pm

Chemistry
Three isotopes of Argon occur naturally: 36Ar (mass = 35.9675 amu) 38Ar (mass = 37.9627 amu) 40Ar (mass = 39.9624 amu) If the percent abundance of 36Ar is 0.3400, what is the percent abundance of 40Ar?
Wednesday, September 24, 2014 at 8:17pm

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