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April 18, 2015

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

chemistry
2.) If you pass 10.0mL of a 50.0mL solution of [Co(en)2Cl2]Cl that has been reduced with Zn through a cation exchange column, you will obtain a solution that has three H+ ions for every Co3+ ion that was originally present in the sample. These H+ ions are titrated with 0.10-M ...
Sunday, October 26, 2014 at 3:07pm

chemistry
If you pass 10.0mL of a 50.0mL solution of [Co(en)2Cl2]Cl that has been reduced with Zn through a cation exchange column, you will obtain a solution that has three H+ ions for every Co3+ ion that was originally present in the sample. These H+ ions are titrated with 0.10-M ...
Sunday, October 26, 2014 at 3:05pm

chemistry
If you pass 10.0mL of a 50.0mL solution of [Co(en)2Cl2]Cl that has been reduced with Zn through a cation exchange column, you will obtain a solution that has three H+ ions for every Co3+ ion that was originally present in the sample. These H+ ions are titrated with 0.10-M ...
Sunday, October 26, 2014 at 3:04pm

chemistry
2.) If you pass 10.0mL of a 50.0mL solution of [Co(en)2Cl2]Cl that has been reduced with Zn through a cation exchange column, you will obtain a solution that has three H+ ions for every Co3+ ion that was originally present in the sample. These H+ ions are titrated with 0.10-M ...
Sunday, October 26, 2014 at 3:02pm

Chemistry
The combustion of propane and oxygen produces carbon dioxide and water. What mass of water is produced from the combustion of 10.4g of propane, C3H8
Sunday, October 26, 2014 at 2:34pm

chemistry
A 100 L flask contains a mixture of methane and argon gasses at 25 degree C . The mass of argon present is 228 g and the mole fraction of methane in the mixture is 0.650 . calculate the total kinetic energy of gaseous mixture
Sunday, October 26, 2014 at 2:07pm

Chemistry
Calculate the mass in grams of the undiluted bleach that was in the sample of bleach titrated. Given: Density of undiluted bleach unkown is 1.042 g/mL. 14.44 mL of .100 M Na2S2O3. .0537 grams of NaClO. Each sample should conain 1/5 of the original undiluted bleach. Since 5mL ...
Sunday, October 26, 2014 at 1:08pm

Chemistry
In a constant-pressure calorimeter, 60.0 mL of 0.310 M Ba(OH)2 was added to 60.0 mL of 0.620 M HCl. The reaction caused the temperature of the solution to rise from 22.19 °C to 26.41 °C. If the solution has the same density and specific heat as water, what is ΔH ...
Sunday, October 26, 2014 at 12:44pm

chemistry
A compressed gas cylinder contains 1.00 into 1000 g argon gas . the pressure inside the cylinder is 2050 psi at a temp of 18 degree . how much gas remains in the cylinder if the pressure is decreased to 650 psi at a temperature of 26 degree of 26 degree c
Sunday, October 26, 2014 at 11:01am

Chemistry
Find the enthalpy change of the following reactions 2C+2H2O---> CO2+CH4 Using the following reactions with their change in H values. C+H2O---->CO+H2 H=+131.1kjmol-1 Co+H2O---->CO2+H2. H=-41.2kjmol-1 CH4+H2O--->CO+3H2 H=15.3
Sunday, October 26, 2014 at 10:47am

Chemistry
Find the enthalpy change of the following reactions 2C+2H2O---> CO2+CH4 Using the following reactions with their change in H values. C+H2O---->CO+H2 H=+131.1kjmol-1 Co+H2O---->CO2+H2. H=-41.2kjmol-1 CH4+H2O--->CO+3H2 H=15.3
Sunday, October 26, 2014 at 10:47am

Chemistry
A 5.00 mL sample of an aqueous solution of H3PO4 requires 43.2mL of 0.285M NaOH to convert all of the H3PO4 to Na2HPO4. The other product of the reaction is water. Calculate the molarity of the H3PO4 solution.
Sunday, October 26, 2014 at 10:35am

Physical Chemistry
Please help, about real gas deviation from ideal behavior. when we plot graph against P and PV, at 17¡ãC,: for H2, there's straight ascending line. for N2, line a little curved at low P then become ascending straight like H2. for CO2, line curved, very ...
Sunday, October 26, 2014 at 10:23am

chemistry
A bicycle tire fitted was fitted with the air pressure of 75 psi at temperature 19 degree C riding the bike on a asphalt on a hot day increases temperature of the tire to 58 degree C. The volume increase by 4% . What is the new pressure
Sunday, October 26, 2014 at 9:48am

chemistry
Given that 1mole of propane react with 5 moles of Oxygen.find the number of moles of Oxygen reacted with 2.2g of propane
Sunday, October 26, 2014 at 9:34am

chemistry
Calculate the pH of 0,3g calcium hydroxide dissolved in water to give 500ml solution.
Sunday, October 26, 2014 at 8:23am

chemistry
The reaction of 2.5 mol of O2 with 4.6 mol of C3H8 will produce ________ mol of H2O.
Sunday, October 26, 2014 at 5:59am

Chemistry
If 0.200mol of nitrogen gas and 0.200mol of oxygen gas react, what is the limiting reactant? N2(g)+O2(g)→2NO(g) How many moles of NO are produced according to the equation? Please show how to perform this equation with the answer please.
Saturday, October 25, 2014 at 11:45pm

chEMISTRY
Before investigating the scene, the technician must dilute the luminol solution to a concentration of 4.00×10−2M . The diluted solution is then placed in a spray bottle for application on the desired surfaces. How many moles of luminol are present in 2.00 L of the ...
Saturday, October 25, 2014 at 11:11pm

Chemistry-Help Dr. Bob
How many mL of Carbon Dioxide gas at STP are produced from the decomposition of 4.50g of Ferric Carbonate? This is How I tried to solve it..... 4.50g Fe12(CO3)3* 1 molFe2(CO3)3/291.72g Fe2(CO3)3* 3 mol CO2/1 mol Fe2(CO3)3* 22.4L CO2/1mol CO2* 1000ml of CO2/1 L of CO2 = 1036.57...
Saturday, October 25, 2014 at 10:36pm

Chemistry
Which of the following reactions are spontaneous (favorable)? A. DHAP ---> glyceraldehyde - 3 - phosphate ΔG=3.8 kJ/mol B. C2H4+H2 ----> C2H6 ΔG=-150.97kJ/mol C. C4H4O5 ---> C4H2O4+H2O ΔG=3.1 kJ/mol D. L-malata + NAD + ---> oxalocacetate + NADH+H...
Saturday, October 25, 2014 at 9:55pm

Chemistry
How many grams of chlorine gas must react to give 4.82g of BiCl3? 2Bi(s)+3Cl2(g)→2BiCl3(s) My answer was wrong/please review and tell me where I went wrong. 4.82g BiCl3*1mol BiCl3/215.33g BiCl3*3 mol Cl2/2 mol Bicl3* 70.9g Cl2/1 mol Cl2=6.50 g Cl2
Saturday, October 25, 2014 at 9:25pm

Chemistry
The volume of a gas is 17.7 mL at 41◦C and 0.819 atm. What will the volume be at 16◦C and 0.996 atm? Answer in units of mL
Saturday, October 25, 2014 at 7:21pm

Chemistry
If I used 24.6 g of of 0.83 M HC2H3O2 (aq) (0.83 mol per 1 L of solution), how much carbon dioxide would be produced? (IT IS ASSUMED YOUR ANSWER IS IN L CO2 so you do not need to include that in your answer.)
Saturday, October 25, 2014 at 6:40pm

chemistry
If I used 0.100L of 0.83 M HC2H3O2 (aq) (0.83 mol per 1 L of solution), how much carbon dioxide would be produced? (IT IS ASSUMED YOUR ANSWER IS IN L CO2 so you do not need to include that in your answer.)
Saturday, October 25, 2014 at 6:39pm

chemistry
If you wanted to produce 0.25 L of CO2 gas (at STP), how many grams of sodium bicarbonate would I need to use? Acetic acid is in excess. (IT IS ASSUMED YOUR ANSWER IS IN g NaHCO3 so you do not need to include that in your answer.)
Saturday, October 25, 2014 at 6:39pm

Chemistry
For the complete combustion of 1.000 mole of ethane gas at 298K and 1 atm pressure, change in H= -1560 kJ/mol. What will be the heat released when 4.42g of ethane is combusted under these conditions?
Saturday, October 25, 2014 at 12:49pm

Chemistry
How does BF4^- make tetrahedral structure. Because B have 3 outermost electrons. It may combine with three fluorine. But how is it combining with 4?
Saturday, October 25, 2014 at 12:27pm

chemistry lab
If a portion of your aspirin sample had broken down, how would that effect the total amount of base used? What would the effect be on the percentage of aspirin in your sample?
Saturday, October 25, 2014 at 11:49am

Chemistry
How many moles of magnesium are in Magnesium Chloride?
Saturday, October 25, 2014 at 6:11am

chemistry
what is the freezing point of 0.05 M glucose(C6H12O6), 0.05 M NaCl, and 0.05 M MgCl2?
Saturday, October 25, 2014 at 6:10am

chemistry
if 8 moles of fructose are fermented and 320g of ethanol is obtained,what is the yield of the fermentation
Saturday, October 25, 2014 at 4:06am

Chemistry
please HELP!! mass of magnesium chloride =.2 mass of chlorine in magnesium chloride =.1 A)moles of magnesium? B)moles of chlorine? C)moles of magnesium divided by the smaller number of moles? D)moles of chlorine divided by the smaller number of moles? E)experimental empirical ...
Saturday, October 25, 2014 at 1:41am

Chemistry
Ammonium carbonate decomposes upon heating according to the following balanced equation: (NH4)2CO3(s)→2NH3(g)+CO2(g)+H2O(g)​ Calculate the total volume of gas produced at 24.0∘C and 1.02atm by the complete decomposition of 11.9g of ammonium carbonate. Please ...
Saturday, October 25, 2014 at 12:07am

AP Chemistry
Calculate the heat that must be supplied to a 544 g stainless steel vessel containing 333 g of water to raise its temperature from 16.4◦C to the boiling point of water 100◦C **Please help me find the delta T of steel too**
Friday, October 24, 2014 at 11:07pm

Chemistry
Assuming an element's half-life is 3.6 years. How much of 2 grams of the element would remain after 10.8 years?
Friday, October 24, 2014 at 8:15pm

Chemistry
What mass of Manganese (II) Chloride must react with sulfuric acid to release 45.0ml of hydrogen chloride gas at STP? Please list step by step.
Friday, October 24, 2014 at 7:07pm

Chemistry
There are 3.20e22 atoms of copper in the outer shell of pennies. How many grams of copper is this?
Friday, October 24, 2014 at 1:52pm

Chemistry
Calculate the value (calories) for the heat of solution. Mass of NaOH: 2.03 g ΔT for reaction A : 8 °C
Friday, October 24, 2014 at 12:18pm

chemistry
A compound contains 14.5 g of magnesium and 3.5 g of oxygen. What is the mass percent of oxygen in the compound?
Friday, October 24, 2014 at 8:45am

chemistry
What would be the MOLARITY (M) of the NaBr in the same buffer solution, if its concentration is now 0.9% (w/v)? Relative atomic masses:Na = 23; Br = 80
Friday, October 24, 2014 at 4:56am

chemistry
H3PO4+3Ca(OH)2=Ca3(PO4)2=6H2O If 44.6g of Ca3(PO4)2 are formed in the above reaction, how many moles of H3PO4 must have been consumed?
Friday, October 24, 2014 at 3:06am

Chemistry
the solubility of aluminum sulfate in water at 20 degrees celcius is 26.7 g/100mL Calculate the molarity?
Friday, October 24, 2014 at 1:33am

chemistry
Hemoglobin is the oxygen carrying molecule of red bloods and contains 4 atoms of iron per molecule of hemoglobin. A sample of hemoglobin weighing 13.4 g contains 45.6 mg iron. What is the molecular mass of hemoglobin? I'm unsure of where to begin with this problem. I know ...
Friday, October 24, 2014 at 12:55am

math
chemistry experiment needed 12.45 grams of chemical to produce one liter of a gas. If Zoe wanted 24 liters of gas, how many kilograms of the chemical will she need?
Friday, October 24, 2014 at 12:55am

chemistry
You need 2.5 moles of aluminum for an experiment. How many atoms of aluminum is this?
Friday, October 24, 2014 at 12:42am

Chemistry
How many moles of ammonia are in 1.20E25 molecules of ammonia.
Thursday, October 23, 2014 at 10:39pm

chemistry
what is the excess reactant of H2SO4+2NaOH->Na2SO4+2H2O H2SO4: NaOH: n=? n=? c=0.025M c=0.030M v=0.4L v=0.4
Thursday, October 23, 2014 at 10:20pm

Chemistry
A volume of 100mL of a 0.330M HNO3 solution is titrated with 0.370M KOH. Calculate the volume of KOH required to reach the equivalence point.
Thursday, October 23, 2014 at 9:59pm

Chemistry
Suppose 300.0 mL of 0.50 M HCl and 300.0 mL of 0.50 M NaOH, both initially at 22.0°C, are mixed in a thermos flask. When the reaction is complete, the temperature is 25.4°C. Assuming that the solutions have the same heat capacity as pure water, compute the heat ...
Thursday, October 23, 2014 at 9:53pm

chemistry
Calculate the word done in joules when 1.0 mile of water vaporizes at 1.0 atm and 100 degrees Celsius. Assume that the volume of liquid water is negligible compared with that of steam at 100 degrees celcius, and ideal gas behavior.
Thursday, October 23, 2014 at 9:33pm

Chemistry
Suppose that 0.250mol of methane, CH4(g), is reacted with 0.400mol of fluorine, F2(g), forming CF4(g) and HF(g) as sole products. Assuming that the reaction occurs at constant pressure, how much heat is released? Substance ΔH∘f (kJ/mol) C(g) 718.4 CF4(g) −679....
Thursday, October 23, 2014 at 9:30pm

Chemistry
It requires 120 J of heat to raise the temperature of 70.0 g of rhodium from 280.0 K to 287.8 K. What is the molar heat capacity of rhodium?
Thursday, October 23, 2014 at 9:22pm

Chemistry
Constant-volume calorimeters are sometimes calibrated by running a combustion reaction of known ΔE and measuring the change in temperature. For example, the combustion energy of glucose is 15.57 kJ/g. When a 2.500 g sample of glucose burns in a constant volume calorimeter...
Thursday, October 23, 2014 at 9:21pm

Chemistry
A home swimming pool contains 145 m3 of water. At the beginning of the swimming season, the water must be heated from 20 to 32°C. How many joules of heat energy must be supplied?
Thursday, October 23, 2014 at 9:21pm

Chemistry
A piece of aluminum with mass of 5.0 g is immersed in 30.0 g of water. This system is heated electrically from 20.8 to 42.6°C. How many joules of energy are absorbed by the aluminum? (Cpaluminum = 24.4 J/mol-K; 1 mole of aluminum has a mass of 27.0 g)
Thursday, October 23, 2014 at 9:20pm

Chemistry (urgent)
Hydrolysis of a compound A, C7H6cl2 was carried out by refluxing with excess potassium hydroxide solution. the resulting solution was acidified with dilute HNO3 acid and excess silver nitrate was added to precipitate the chloride ions as silver chloride. 0.718g of silver ...
Thursday, October 23, 2014 at 8:48pm

Chemistry
Please help Suppose that 0.250mol of methane, CH4(g), is reacted with 0.400mol of fluorine, F2(g), forming CF4(g) and HF(g) as sole products. Assuming that the reaction occurs at constant pressure, how much heat is released? Substance ΔH∘f (kJ/mol) C(g) 718.4 CF4(g...
Thursday, October 23, 2014 at 5:57pm

Chemistry
Solid urea, (NH2)2CO, burns to give CO2,N2, and liquid H2O. Its heat of combustion is -632.2 kJ/mol. Balance the equation for combustion of urea, and calculate the heat generated per mole of H2O formed. (Enter in kJ.)
Thursday, October 23, 2014 at 5:47pm

Chemistry
A volume of 100.mL of H2O is initially at room temperature (22.00 ∘C). A chilled steel rod at 2.00 ∘C is placed in the water. If the final temperature of the system is 21.50 ∘C , what is the mass of the steel bar? Use the following values: specific heat of ...
Thursday, October 23, 2014 at 4:24pm

Chemistry
A 0.84 g sample of caffeine, C8H10N4O2, burns in a constant-volume calorimeter that has a heat capacity of 7.85 kJ/K. The temperature increases from 298.30 K to 303.35 K. What is the molar heat of combustion of caffeine (in kJ).
Thursday, October 23, 2014 at 4:23pm

Chemistry
A coin dealer, offered a rare silver coin, suspected that it might be a counterfeit nickel copy. The dealer heated the coin, which weighed 14.0 g to 100°C in boiling water and then dropped the hot coin into 27.5 g of water at T = 17.0°C in an insulated coffee-cup, and ...
Thursday, October 23, 2014 at 4:18pm

Chemistry
A home swimming pool contains 145 m3 of water. At the beginning of the swimming season, the water must be heated from 20 to 32°C. How many joules of heat energy must be supplied?
Thursday, October 23, 2014 at 4:07pm

Chemistry
An electrical heater is used to add 20.50 kJ of heat to a constant-volume calorimeter. The temperature of the calorimeter increases by 5.42°C. When 1.25 g of methanol (CH3OH) is burned in the same calorimeter, the temperature increases by 7.49°C. Calculate the molar ...
Thursday, October 23, 2014 at 3:16pm

Chemistry
Suppose 100.0 mL of 1.00 M HCl and 100.0 mL of 1.00 M NaOH, both initially at 23.0°C, are mixed in a thermos flask. When the reaction is complete, the temperature is 29.8°C. Assuming that the solutions have the same heat capacity as pure water, compute the heat ...
Thursday, October 23, 2014 at 3:13pm

Chemistry
The Ksp for BaCrO4 is 1.2X10-10. Will BaCrO4 precipitate when 10 mL of 1 X10-5M Ba(NO3)2 is mixed with 10 mL of 1X10-3M K2CrO4? I am not sure where to start
Thursday, October 23, 2014 at 11:04am

Chemistry
88-L sample of dry air cools from 197 degree celsius to -48 degrees celsius while the pressure is maintained at 2.93 atm. what is the final volume?
Thursday, October 23, 2014 at 10:25am

CHEMISTRY
How many moles of magnesium are needed to react with 16 g of O2? 2 MgO (s) + O2 (g) → 2 MgO (s)
Thursday, October 23, 2014 at 1:11am

Chemistry
When 5.4 g of NaCl and 3.6 g of AgNO3 are dissolved in water and mixed, what ions remain in the solution and how many moles of each will be there?
Thursday, October 23, 2014 at 12:39am

Chemistry
26.5 kJ of heat is added to 5.44 g of ice at 0 C. What phase(s) are present and what is the temperature of the system after all the heat is absorbed?
Thursday, October 23, 2014 at 12:39am

Chemistry
You are given 21.0 mL of a 5.00% solution of NaOH. The solution has a density of 1.02 g/mL. What volume of 0.0895M H2SO4 will you need to completely and exactly react (neutralize) the NaOH?
Wednesday, October 22, 2014 at 11:26pm

Chemistry
Find the change in internal energy for this reaction. Enter in kJ. 2C2H2(g) + 5O2(g) → 4CO2(g) + 2H2O(l) Enthalpy of reaction= -2599 kJ
Wednesday, October 22, 2014 at 10:25pm

Chemistry
a solution of arsenic oxide containing 0.24g required 50cm^3 of acidified potassium manganate of solution of concentration 0.02M for complete oxidation. What is the oxidation state of arsenic in the product?
Wednesday, October 22, 2014 at 10:14pm

Chemistry
a compound of nitrogen and oxygen is 30.46% by mass N and 69.54% by mass O. the molar mass if the compound was determined to be 92g/mol. What is the empirical formula of the compound? What is the molecular formula of the compound?
Wednesday, October 22, 2014 at 10:09pm

Chemistry
When 6.25grams of pure iron are allowed to react with oxygen, a black oxide forms. If the products weighs 8.15g, what is empirical formula of the oxide?
Wednesday, October 22, 2014 at 10:04pm

Chemistry (urgent)
Calculate the volume of an acidified solution of 0.02M potassium manganate that would be used to oxidize 100cm^3 of magnesium etanedioate.
Wednesday, October 22, 2014 at 9:37pm

Chemistry
Plot the titration of a weak base with a strong acid. Show the titration curve using .106M NH3 and .225M HCl for a 50.00mL sample of the ammonia. No idea where to start here. I'm supposed to plot the curve from 2mL increments (0-30). Tip on homework: *Remember to use the ...
Wednesday, October 22, 2014 at 8:34pm

Chemistry
what is the limiting reagent in these two reactions Reaction 1: CuSO4+2NaOH=Cuo+Na2SO4+H2O Reaction 2: CuSO4+NaCO3=CuCO3+Na2SO4
Wednesday, October 22, 2014 at 7:51pm

Chemistry
Indicate whether Fe3+ ions are reduced by silver under standard conditions.
Wednesday, October 22, 2014 at 6:52pm

PSYCH/SOCIOLOGY!!!
Should I take psychology before sociology or take sociology before psychology. Like saying "You can't do well in chemistry unless you finish biology"
Wednesday, October 22, 2014 at 6:34pm

Chemistry 111
Gaseous ethane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water . Suppose 17. g of ethane is mixed with 107. g of oxygen. Calculate the minimum mass of ethane that could be left over by the chemical reaction. Be sure your answer has the ...
Wednesday, October 22, 2014 at 5:46pm

Chemistry
How much work must be done on a system to decrease its volume from 14.0 L to 5.0 L by exerting a constant pressure of 4.0 atm?
Wednesday, October 22, 2014 at 5:13pm

chemistry
Calculate ∆T for the reaction. Assume the initial temperature of both reactants is 25.0◦C. Calculate the volume of the reaction mixture. Calculate the mass of the reaction mixture. Assume the density of the mixture is 1.03 g mL^(-1). Calculate the heat transferred ...
Wednesday, October 22, 2014 at 4:31pm

Chemistry
What is the pressure (in mmHg) of the gas inside the apparatus below if the atmospheric pressure is Patm=748 mmHg, h1=40 mmHg, and h2=67 mmHg?
Wednesday, October 22, 2014 at 4:05pm

Chemistry
1. Sodium can be extracted by heating naturally occurring salt until it is molten. An electrochemical process is then used to extract the sodium. Cl2 is produced at the anode, and Na is collected at the cathode. A standard reduction potential graph for the reaction is shown ...
Wednesday, October 22, 2014 at 3:12pm

Chemistry
3. An electrochemical reaction occurs between an unknown element and zinc. The half-cell reaction for the zinc is: Zn(s) → Zn2+(aq) + 2e− The cell potential for the reaction is Eºcell = 1.83 V. a. Is the reaction spontaneous or nonspontaneous? Explain. (1 ...
Wednesday, October 22, 2014 at 3:09pm

Chemistry
2. Aluminum metal reacts with zinc(II) ion in an aqueous solution by the following half-cell reactions: Al(s) → Al3+(aq) + 3e− Zn2+(aq) + 2e− → Zn(s) a. Predict the potential of the cell under standard conditions. (4 points) b. Predict whether the ...
Wednesday, October 22, 2014 at 3:08pm

Easy chemistry
Which statement correctly identifies how a lead-storage battery in a car works? A. The battery acts as a galvanic cell as it provides current to the radio. B. The battery acts as a galvanic cell as it is recharged by the alternator. C. The battery acts as an electrolytic cell ...
Wednesday, October 22, 2014 at 1:27pm

Chemistry
Which statement correctly identifies how a lead-storage battery in a car works? A. The battery acts as a galvanic cell as it provides current to the radio. B. The battery acts as a galvanic cell as it is recharged by the alternator. C. The battery acts as an electrolytic cell ...
Wednesday, October 22, 2014 at 12:56pm

Chemistry
In a titration for the determination of the chloride ion, a solution of 0.1M agno3 is used against a solution, the volume of which is 100ml. At the completion of the titration, the residual concentrations of silver and chloride ions are equal and the total volume is now 125ml...
Wednesday, October 22, 2014 at 7:04am

Chemistry
In a titration for the determination of the chloride ion, a solution of 0.1M agno3 is used against a solution, the volume of which is 100ml. At the completion of the titration, the residual concentrations of silver and chloride ions are equal and the total volume is now 125ml...
Wednesday, October 22, 2014 at 7:03am

Chemistry
Energy in the amount of 420J is added to a 35g sample of water at a temperature of 10.0 C . What is the final temperature of water ?
Wednesday, October 22, 2014 at 6:48am

chemistry
The percentage of C,H,O in vitamin C were determined by burning a sample weighing 2.00g. The masses of carbon dioxide and water formed are 3.00mg and 0.81mg respectively. Find the percentage of each element and the empirical fomula of vitamin C
Wednesday, October 22, 2014 at 2:51am

chemistry
How many moles of magnesium are needed to react with 16 g of O2? 2 MgO (s) + O2 (g) → 2 MgO (s)
Wednesday, October 22, 2014 at 1:14am

Chemistry
Calculate the molarity of 25.00ml H2SO4 solution if 32.48ml of 0.1068M NaOH is required to titrate? Balanced equation is H2SO4(aq)+2NaOH(aq)=Na2SO4(aq)+2 H2O (l)
Wednesday, October 22, 2014 at 12:36am

chemistry
what amount of heat is needed to increase the temperature of 95.3g of copper from 25 degrees Celsius to 48 degrees Celsius? The value of Cp for copper is 0.387 degrees Celsius.
Wednesday, October 22, 2014 at 12:04am

chemistry
What amount of Heat is needed to increase the temperature of 95.3 g of copper from 25.0 degrees celsius to 48 degrees celsius? The value of Cp for copper is 0.387 degrees celsius
Tuesday, October 21, 2014 at 11:21pm

Chemistry
A 35.0-L cylinder contains 387 g O2(g) at 22.5°C. What mass of O2(g) must be released to reduce the pressure in the cylinder to 5.94 atm, assuming the temperature remains constant?
Tuesday, October 21, 2014 at 10:24pm

Chemistry
What is energy difference between staggered and eclipsed conformations of 2,2,3,3-tetramethylbutane? Is it 2k/J/mol? Interaction Energy Cost (kJ/mol) H/H Eclipsed 4 CH3/H Eclipsed 6 CH3/CH3 Eclipsed 11 CH3/CH3 Gauche 3.8
Tuesday, October 21, 2014 at 10:08pm

Chemistry
What is the percentage of the S enantiomer in a sample of carvone that has a specific rotation of 30, given that the specific rotation of (R)-carvone is -61? How do i set up the problem?
Tuesday, October 21, 2014 at 10:04pm

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