# 1.92g sample of hydrogen peroxide solution generates 37.8mL O2 at 759 torr and 35 C. What is the percent strength of the peroxide solution? how would you solve this problem and which equations would you use?

39,177 questions
1. ## chemistry

1.92g sample of hydrogen peroxide solution generates 37.8mL O2 at 759 torr and 35 C. What is the percent strength of the peroxide solution? how would you solve this problem and which equations would you use?

asked by anna on February 7, 2008
2. ## Math algebra

David Robertson works as a chemical engineer for U.S. peroxide Corporation. David has 2500 gallons of commercial-grade hydrogen peroxide solution that is 60% pure hydrogen peroxide. How much distilled water(which is 0% hydrogen peroxide) will David need to

asked by Selena on November 9, 2016
3. ## Chemistry

I have .8ml of 35% by weight hydrogen peroxide. The hydrogen peroxide density is 1.14 g/ml. how many moles of hydrogen peroxide are there?

asked by Dina on February 8, 2014
4. ## Chemistry

2MnO4-(aq) +5 H2O2 (aq) + 6H+(aq) -> 5 O2(g) + 2 (Mn2+(aq) = 8H2O (l) If a 25.00 ml sample of hydro peroxide required 25.25 ml of .353 M KMNo4 solution to react with all the hydrogen perozide what was the molarity of the hydrogen peroxide solution?

asked by Vinny on June 7, 2011
5. ## Chem

You have 25.00 mL of 3% by mass solution of hydrogen peroxide. Assume the density of this solution is 1.00 g/mL. If all of the hydrogen peroxide decomposes to water and oxygen according to the reaction below: 2H2O2 (aq) 2H2O (l) + O2 (g) What is the total

asked by Blake on September 21, 2015
6. ## chemistry

Commercial aqueous hydrogen peroxide was diluted 150 times. 25cm3 of the sample solution was titrated with 0.02molar KMnO4 and 26.3cm3 was required to reach the end point. Calculate the molar concentration of hydrogen peroxide

asked by Sarah on February 13, 2018
7. ## chemistry

2mno4 - + 5h2o2 + 6h= 2mn 2+ + 5o2(gás) + 8h2o You must determine the percentage of hydrogen peroxide (H2O2) in a solution by permangan titration. In an acid solution, the permanganations will oxidize hydrogen peroxide to oxygen gas ......... You must

asked by Nouri on September 16, 2017

Small quantites of hydrogen peroxide can be prepared by the action of an acid on an alkaline earth metal peroxide, such as barium peroxide. BaO2 (s) + 2HCl (aq) -> H2O2 (aq) + BaCl2 (aq) What mass of hydrogen peroxide should result when 15.0g of barium

asked by Frances on November 5, 2012
9. ## Chemistry

Determine the molarity of a 15.0 % by mass Hydrogen Peroxide solution. The density of Hydrogen Peroxide is 1.054 g/mL. The 15.0% by mass can be broken apart into 15.0 g Hydrogen Peroxide and 100.0 g solution. Use the density of Hydrogen Peroxide solution

asked by Jenna on February 1, 2015
10. ## Chemistry

a 5.000ml aqueous sample containing hydrogen peroxide as diluted to 25ml and analyzed by titration with permanganate. 2MnO4- + 5H2O + 6H+ --> 5O2 + 2Mn^2+ + 8H2O The sample required 42.8 mL of 0.0175 M permangante to reach the end point. What is the

asked by Sarah on December 9, 2015
11. ## Chemisty

Based on equation: 2MnO4¬¬(-) + 6H(+) +5H2O2 → 2Mn(2+) +8H2O + 5O2 A 50.0 mL solution of hydrogen peroxide of unknown concentration was diluted with 1.00L of water. 25mL of this diluted solution was then titrated with acidified potassium permanganate;

asked by Bree on September 23, 2015
12. ## chemistry

Household hydrogen peroxide is an aqueous solution containing 3.0% hydrogen peroxide by mass. What is the molarity of this solution? (Assume a density of 1.01g/ml .)

asked by Anonymous on November 17, 2010
13. ## uitm

Household hydrogen peroxide is an aqueous solution containing 3.0% hydrogen peroxide by mass. What is the molarity of this solution? (Assume a density of 1.01 g/mL.)

asked by jan on July 27, 2013
14. ## Chemistry

In a student's experiment, when 40 mL of 6% (w/w) hydrogen peroxide solution was reacted with 10 mL 0.5 M FeCl3 solution, a ΔrH of -3,382 J was calculated. Calculate ΔH for this reaction in kJ mol-1. Give your answer to 2 decimal places, do not include

asked by Anon on April 19, 2016
15. ## chemistry

starting with a 30% (W/W) SOLUTION OF HYDROGEN PEROXIDE, how many mL would you need to dilute on order to end up with 25.00ml of a 3.6M hydrogen peroxide solution?

asked by sue on November 5, 2012
16. ## Chemistry

How to prepare 100mL of 3% w/w Hydrogen Peroxide from 30% w/w Hydrogen Peroxide?Specific Gravity of 30%w/w Hydrogen Peroxide is 1.11g/mL. Can you please show the calculation steps? Thanks.

asked by annie on February 18, 2012
17. ## Chemistry

Hydrogen peroxide solution, H2O2(aq), is available with a concentration of 1.667mol/L. When diluted to a concentration of 0.25mol/L, the solution is used as a disinfectant. What volume of water should be added to 100 mL of the concentrated hydrogen

asked by Lori on February 21, 2013
18. ## Pharmacy Math

How much stock solution of hydrogen peroxide 8% will you need to make 320ml of hydrogen peroxide 2% solution? ____

asked by Betty on July 30, 2012
19. ## Pharmacy Math

How much stock solution of hydrogen peroxide 8% will you need to make 320ml of hydrogen peroxide 2% solution? ____

asked by Jean on July 30, 2012
20. ## Chemistry

Describe the formation of hydrogen bonds in a hydrogen peroxide, H2O2. Represent possible hydrogen bonding structures in hydrogen peroxide by using structural formulas and the conventional notation for a hydrogen bond.

asked by Lauren on February 3, 2008
21. ## math

How much stock solution of hydrogen peroxide 8% will you need to make 320ml of hydrogen peroxide 2% solution?

asked by Anonymous on December 9, 2012
22. ## Chemistry

How would I find the volume of 30% hydrogen peroxide solution from 20mL of 3% hydrogen peroxide solution?

asked by Zach on September 28, 2012
23. ## Chemistry

Redox titrations are used to determine the amounts of oxidizing and reducing agents in solution. For example, a solution of hydrogen peroxide, , can be titrated against a solution of potassium permanganate, . The following equation represents the reaction:

asked by Peter on September 18, 2010
24. ## college chemistry

2h2o2(aq) ---> 2h2o(l) + o2(g) if someone puts 0.470 ml of hydrogen peroxide on a cut how many moles of hydrogen peroxide are used? Assume the density of the solution is equal to the density of water.

25. ## chemistry HELP!!

Reaction Rate = -(1/2) [d(H2O2)/dt] = [d(O2)/ dt] Using 25 mL of a 0.2 M hydrogen peroxide solution, the following results are obtained from the equation above: 8.62 mL of gas is collected in 120 seconds. (Assume 760 Torr = 1 atm) Room temperature is 25

asked by Aaron on September 21, 2015
26. ## Chemistry

Redox titrations are used to determine the amounts of oxidizing and reducing agents in solution. For example, a solution of hydrogen peroxide,H2O2, can be titrated against a solution of potassium permanganate, KMnO4. The following equation represents the

asked by Ellen on October 3, 2010
27. ## chemistry

What is the mass of hydrogen peroxide, H2O2, in a 250 g sample of a 2.75% by weight solution?

asked by Anonymous on October 10, 2011
28. ## CHEM

Hydrogen peroxide (H2O2) is decomposed according to the following reaction: 2H2O2 (l) ¡÷ 2H2O (l) + O2 (g) If 6.00 g of aquesous solution containing hydrogen peroxide was decomposed after heating, the mass of oxygen gas collected is 2.40 g, what is the

asked by CHAN on December 30, 2014
29. ## AP Chem

A solution of hydrogen peroxide, H2O2, is titrated with a solution of potassium permanganate, KMnO4. It requires 51.7 mL of 0.145 M KMnO4 to titrate 20.0 g of the solution of hydrogen peroxide. What is the mass percentage of H2O2 in the solution? If you

asked by Anna on November 3, 2008
30. ## Chemistry

What amount of hydrogen peroxide should result when 1.21 g of barium peroxide is treated with 25.1 mL of hydrochloric acid solution containing 0.0289 g of HCl per mL?

asked by Jess on February 29, 2012
31. ## chem

In the reaction of hydrogen peroxide with iron (II) ion in acidic solution to form iron (III) ion and water, the oxidizing agent is____. Is it hydrogen peroxide?

asked by Blair on August 11, 2008
32. ## AP Chemistry

a student titrates three samples of 0.3% hydrogen peroxide solution made from a bottle of 3% hydrogen peroxide solution dated 10/31/2007. would you expect the calculated molarities of the samples to be higher or lower than the following values: trial 1:

asked by Gabriella on October 5, 2013
33. ## chemistry

How many mL of 3% aqueous hydrogen peroxide solution can you make out of 100 mL of 35% aqueous hydrogen peroxide?

asked by Amanda on April 8, 2012
34. ## chemistry

How many mL of 3% aqueous hydrogen peroxide solution can you make out of 100 mL of 35% aqueous hydrogen peroxide?

asked by Amanda on April 8, 2012
35. ## chemistry

Hydrogen peroxide can be produced in the lab by reacting barium peroxide with hydrochloric acid. another product of the reaction is barium chloride. 1). what is the balanced chemical equation for the reaction? 2). what mass of hydrogen peroxide should

asked by akboyer31 on April 22, 2012
36. ## chemistry

In the reaction of hydrogen peroxide with iron (II) ion in acidic solution to form iron (III) ion and water, the oxidizing agent is____ is it hydrogen peroxide? cus its not water right?

asked by Amy on April 15, 2008
37. ## Chemistry

Hydrogen peroxide, H2O2, solution can be purchased in drug stores and used as an antiseptic. A sample of such a solution weighing 1.00 grams was acidified with sulfuric acid and titrated with .02000 M solution of KMnO4. The unbalanced reaction is H2O2(aq)

asked by HELP!!! on April 15, 2010
38. ## Chemistry

HI, we conducted a qualitative analysis, to identify the cations in an unknown sollution..trying to determine whether it had Al 3+, Fe (3), and Lead ions..i am having trouble understanding some parts of the procedure. before testing for aluminum and iron,

asked by Joe on February 28, 2010
39. ## chemistry

Hello all (Damon if he is there) I need to make some Cupro CHLORIDE but it says I must use hcl, copper and hydrogen peroxide. I can't get hydrogen peroxide here in Malawi so does any one have a suggestion.many thanks David

asked by David O Reilly on February 1, 2019
40. ## Chemistry

If i have 0.5 mole of hydrogen peroxide how many moles of oxygen would be produced assuming all of the hydrogen peroxide decomposes?

asked by Kayla on April 30, 2016
41. ## Chemistry

If i have 0.5 mole of hydrogen peroxide how many moles of oxygen would be produced assuming all of the hydrogen peroxide decomposes?

asked by Kayla on May 1, 2016
42. ## chemistry

From a hydrogen peroxide (diluted in water) a sample of 1.00 g is removed, acidifing it with H2SO4 and then titrated with a solution of 0.20 M of KMnO4, requiring 17.6 mL of KMnOH. What is the percentage of H2O2 contained in the bottle?

asked by damon on July 8, 2019
43. ## ap chemistry

BaO2(s) + 2 HCl(aq) H2O2(aq) + BaCl2(aq) What amount of hydrogen peroxide should result when 1.00 g of barium peroxide is treated with 15 mL of hydrochloric acid solution containing 0.0330 g of HCl per mL? So confused... >.

asked by Kris on August 1, 2013
44. ## science

what volume of hydrogen peroxide needs to added to treat the system at 100ppm. available hydrogen peroxide is 35%

asked by nav on June 20, 2017
45. ## chemistry

A 0.0677 g sample of magnesium metal reacted with excess hydrochloric acid solution to produce 69.9 mL of hydrogen gas. The gas was collected over water at 21.0° C. The levels of water inside and outside the gas collecting tube are identical (meaning that

asked by Janaiby on July 8, 2013
46. ## chemistry

Hydrogen peroxide decomposes according to the following thermochemical reaction H2O2 --> H2O +1/2 O2 ; H= -98.2 kJ calculate the change in enthalpy when 1.00 g of hydrogen peroxide decomposes.

asked by Brittany on November 20, 2009
47. ## Chemistry

why do hydrogen peroxide and bleach react like they do, and how is the hydrogen peroxide a catlyist?

asked by Anonymous on February 18, 2010
48. ## Chemistry

A sample of hydrogen gas (H2) is produced in a laboratory by displacement of water. A 645 mL sample of hydrogen is collected at 25 degrees Celsius and a total pressure of 758 torr. Collecting gas by water displacement causes the gas to become saturated

asked by Roger on May 20, 2016
49. ## Chemistry

The following reaction represents the decomposition of hydrogen peroxide 2H2O2 -> o2 (g) + 2H2O (l) How many molecules of water are produced from the decomposition of 3.4g of Hydrogen peroxide, H2O2? Please walk me through this one, I need more then just

asked by Andre on October 19, 2010
50. ## Chemistry

A 2.00 ml sample of an aqueous solution of hydrogen peroxide, H2O2 (aq) is treated with an excess of Kl (aq). The liberated I2 requires 12.40 mL of 0.1025 M Na2S2O3, for its titration. Is the H2O2 up to the full strength (3% H2O2 by mass) as an antiseptic

asked by Saira on October 12, 2008

A 2.00 ml sample of an aqueous solution of hydrogen peroxide, H2O2 (aq) is treated with an excess of Kl (aq). The liberated I2 requires 12.40 mL of 0.1025 M Na2S2O3, for its titration. Is the H2O2 up to the full strength (3% H2O2 by mass) as an antiseptic

asked by Sara on October 12, 2008
52. ## chemistry HELP

hydrogen peroxide (H2O2) decomposes into water and oxygen. what amount of hydrogen peroxide is necessary to produce 24g of oxygen.

asked by tarkan on November 11, 2010
53. ## Chem

Ca(s) + 2H+(aq) → Ca2+(aq) + H2(g) An experiment is performed to determine the volume of hydrogen gas produced when calcium reacts with excess HCl(aq) as represented by the net ionic equation above. A 0.0720 g sample of pure calcium and a solution of 1.0

asked by Jess on April 23, 2013
54. ## chemistry

Exactly 1.0 L of hydrogen gas (H2) is collected over water at 292 K under a total pressure of 152 torr. If the vapour pressure of water is 16.5 torr at this temperature, what is the mole fraction of hydrogen in the gas sample? Volume of CO2 = L Mole

asked by nath on December 7, 2011

Hi, sorry I missed out something. The titrant used was 0.100M Sodium thoiosulphate.Do I have to consider its concentration in the calculations? Thanks a lot. Posted by angela on Tuesday, August 3, 2010 at 6:58pm. Please help to determine the (%w/w) benzoyl

asked by angela on August 3, 2010

Please help to determine the (%w/w) benzoyl peroxide (C14H20O4) in a sample. Procedure: 2.500g of sample was dissolved in 75ml dimethylformamide and diluted to 100.0ml with the same solvent. (Solution T). To 5.0ml of Solution T, 20ml of acetone and 3ml of

asked by angela on August 3, 2010
57. ## Chemistry

Some hydrogen gas is collected over water at 20.0 Cel. and the levels inside the container is the same. The partial pressure of hydrogen is 742.5 torr. What is the barometric pressure as the time the gas was collected. My answer is 742.5 torr = 17.5 torr =

asked by Star on June 9, 2017
58. ## chemistry

What is the percentage purity of sample if 3.92g of mohr's salt react completely with 50 ml N/10 Kmno4 solution

asked by ketaki on June 25, 2012
59. ## CHEMISTRY

The following reaction represents the decomposition of hydrogen peroxide: Balanced equation: 2H2O2 -> O2 + 2H2O How many moles of oxygen are produced from the decomposition of 3.4g of hydrogen peroxide? How many molecules of O2 are produced? For the second

asked by Emma on February 23, 2012
60. ## Chemistry

Hydrogen peroxide(H2O2) slowly decomposes to form water and oxygen gas. Calculate the mass of Hydrogen peroxide needed to obtain 0.460L of oxygen gas at STP

61. ## chemistry

Calculate the mass of solute of hydrogen peroxide in a 35% solution if 450 ml of solution is being used

asked by Emmee on February 22, 2012
62. ## science

You have 10 ml of a 1:10,000 solution of hydrogen peroxide (H2O2). What is the molar concentration of the solution?

asked by Marcus on September 5, 2011
63. ## Biology

This is related to a biology lab I did. What is the purpose of adding sand to hydrogen peroxide (and put at a glowing splint at the mouth of the tube)? The purpose of this lab was to study the action of the enzyme catalase (potato)on hydrogen peroxide and

asked by Annie on September 24, 2006
64. ## Chemistry

Hydrogen Peroxide decomposes to produce oxygen gas and water, What mass of hydrogen peroxide (H2O2) nust decompose to produce 0.77 grams of water?

asked by whale on April 10, 2012
65. ## Chem

Hydrogen peroxide decomposes according to the following: H2O2--> H2O(l) + 1/2O2(g); deltaH = -98.2kJ Calculate the change in enthalpy, deltaH, when 1.00g of Hydrogen peroxide decomposes

asked by Lindsey on November 19, 2009
66. ## Chemistry! I need help quick! Thank you very much!

2h2O2 + 2H2O ---> 2H2O + O2 If 50cmcube , 2.0 mole/dmcube of hydrogen peroxide is decomposed and volume of oxygen gas collected. How much hydrogen peroxide is decomposed?

asked by Click6 on June 19, 2011
67. ## Chemistry

Hydrogen peroxide decomposes into water and oxygen. What amount of hydrogen peroxide is necessary to produce 1 kg of oxygen

asked by Tarkan on November 8, 2010
68. ## oxidation

In the reaction of hydrogen peroxide with iron (II) ion in acidic solution to form iron (III) ion and water, the oxidizing agent is... ? Fe(II) ==> Fe(III) H2O2 ==> H2O. Fe goes from +2 to +3, that is a loss of electrons, so it is oxidized (by definition,

asked by Christine on April 19, 2007
69. ## URGENT CHEMISTRY

A solution of hydrogen peroxide is 24.26% by mass and has a density of 1.11g/cm^3. the molarity of the solution? 7.54M .273M 8.03M 8.37M none of these

asked by Cotton McKnight on March 9, 2011
70. ## med math

the pharmacy sends you a vial of 1.5 grams of ampicllin. The instructions state to mix the powders with 9.8ml of sterile water to make a solution of 1.5grams/ 10ml. How much solution would you draw to administer 750mg of ampicillin? Attempt: (750mg X

asked by saya on January 20, 2017
71. ## chemistry

What mass of hydrogen peroxide should result when 1.50g of barium peroxide is reacted with 25.0mL of 0.50 M hydrochloric acid?

asked by confused on December 13, 2011
72. ## AP Chem

a 4.22 gram sample of copper II sulfide was added to excess hydrocholoric acid with hydrogen sulfide gas being generated and collected over water. What volume of hydrogen sulfide gas would be collected at 32 degrees Celcius and 749 torr? The vapor pressure

asked by Susan Shoemaker on December 11, 2007
73. ## Chem- follow up question

Sorry i posted this as an answer after my question had been answered, this is continued from the qualitative analysis question: That reallly cleared some things up, but I do still have a few questions. Umm im not completely clear on the hyrogen peroxide

asked by Joe on February 28, 2010
74. ## Chemistry

Al and Fe react with HCl to produce a chloride salt and hydrogen gas. A .1924g sample of a mixture of Al and Fe is treated with excess HCl solution. A volume of 159mL h2 gas is collected over water at 19C and 841 torr. What is the mass percent by mass of

asked by Lisa on September 29, 2014
75. ## Chemistry

If a catalyst is introduced to ecxellaerate decomposition of Hydrogen Peroxide with the the aid of a condenser and another bottle theat is connectect to the first. This second bottle contains displaced water(bottle of water inverted to leaving an air

asked by Lumina on January 30, 2009
76. ## Chemistry

If a catalyst is introcuced to ecxellaerate decomposition of Hydrogen Peroxide with the the aid of a condenser and another bottle theat is connectect to the first. This second bottle contains displaced water(bottle of water inverted to leaving an air

asked by Lumina on January 30, 2009
77. ## human biology!!!

hi i have a big problem got a practical, the effect of catalase on the rate of reaction on hydrogen peroxide. but i don't know the amount of hydrogen peroxide i should use or the source of enzyme? can anyone help? the source of enzyme cant be liver or

asked by Sarah on March 15, 2007
78. ## Chem year one

what is the balanced net ionic equation for the oxidation of hydrogen peroxide by permanganate ion and find out how many moles of hydrogen peroxide react with one mole of permanganate ion. would the answer be: 2MnO4^- + 6h^+ + 5H2O2 ---> 2Mn^2+ + 8H2O +

asked by kay on November 22, 2013
79. ## Algebra

A chemist mixed some 20% peroxide sol with some 30% peroxide sol to make 500ml of a 25% peroxide solution.How many ml of each solution should be used? HELP just cannot get this one..

asked by S.G on November 9, 2008
80. ## Chemistry

How would I calculate the mass of 20ml of a 3% hydrogen peroxide from a 30% H2O2 solution?

asked by John on September 26, 2012
81. ## Chemistry

The following reaction represents the decomposition of hydrogen peroxide: 2H2O2 -> O2 (g) + 2H2O (l) How many molecules of water are produced from the decomposition of 3.4g of hydrogen peroxide, H2O2? Please help, I got 0.02 molecules of water but need to

asked by Dee on October 17, 2010
82. ## Chemistry

A sample of 40.0 mL of hydrogen is collected by water displacement at a temperature of 20 degrees Celcius. The barometer reads 751 torr. What is the volume of the hydrogen at STP (standard temperature and pressure)?

asked by Kia on December 16, 2012
83. ## Biology Chemistry Part

I'm trying to calculated the rate of reaction In this lab I took a 50 mL beaker and poured in 10 ml of cold distilled water into it, I then poured in 30 ml of original enzyme solution (I believed we used cold potato juice or something), I then took a piece

asked by Kate on September 26, 2010
84. ## chemistry

The bottle of hydrogen peroxide from the store says it is a 3% solution by mass. What is its molal concentration?

asked by billy bob j on April 17, 2008
85. ## Biology Chemistry Part

I'm trying to calculated the rate of reaction In this lab I took a 50 mL beaker and poured in 10 ml of cold distilled water into it, I then poured in 30 ml of original enzyme solution (I believed we used cold potato juice or something), I then took a piece

asked by Kate on September 26, 2010
86. ## chemistry

A 5.00 liter vessel contains carbon monoxide, carbon dioxide, hydrogen and water vapor at equilibrium at 980C. The equilibrium partial pressures are 300. torr, 300. torr, 90. torr, and 150 torr respectively. Carbon monoxide is then pumped into the system

asked by Anonymous on December 6, 2014
87. ## Chemistry

Express the concentration of a commercial hydrogen peroxide solution, which is 3.0 (w/w), as a molarity. Show all work

asked by Amber on March 13, 2014
88. ## Chemistry

A student generated oxygen gas by decomposing hydrogen peroxide (H2O2) according to the following equation: 2H2O2(aq) -> 2H2O(l) + O2(g) If the student started with 1.75 moles of hydrogen peroxide, how many moles of oxygen gas would be produced? Show your

asked by Emily on April 1, 2015
89. ## Chemistry

A compound contains only hydrogen and nitrogen and is 12.6% hydrogen by mass. A gaseous sample of the compound has density of 0.925g/L at 690 torr and 110 degree Celsius. What is the molecular formula of the compound?

asked by K on February 3, 2011
90. ## Chemistry

These are the problems I am having trouble with. 1.The first step of the synthesis is described by the reaction below. When 1.750 g of Fe(NH4)2(SO4)2 6H2O is mixed with 13 mL of 1.0 M H2C2O4 , the theoretical yield of FeC2O42H2O is how many grams?

asked by Thanh on January 26, 2009
91. ## college Chemistry

An aqueous solution of hydrogen peroxide, H202 (MW=34.01amu), is labeled 10.0% by weight. What is the molal concentration of H202? All I really know is that molality = moles of solute per kilogram of solution

asked by Donna on March 28, 2010
92. ## Chemistry

Hydrogen peroxide is used as a bleachin agent, a disinfectant and medicinally as a topical antibacterial agent. Hydrogen peroxide decomposes according to the reacton 2H^2O^2(l)-->2H^2O(l)+o^2(g) A. Given the standard free energy of formation values shown

asked by Christian on May 15, 2007
93. ## College Chem

charles law: 7.89 l sample of gas had pressure of 850 torr. what volume will it occupy if the pressure is changed to 457 torr? (torr is a measurement of pressure. 760 torr = 1 atmosphere

asked by judy on April 22, 2013
94. ## Safety of Tooth Bleaching

Just as I promised, here is my reasearch result on bleaching safety. It took me a whole week to compile the information, go to the store, and basically make a report on the topic refering heavily on the British Dental Journal article which was the only

asked by ~christina~ on August 10, 2007
95. ## chemistry

how many grams of hydrogen peroxide (H2O2) must be added to 1500 ml of water to produce a concentration of 1.33 m (molal solution)

asked by Anonymous on April 19, 2011
96. ## Chemistry

How many grams of hydrogen peroxide (H2O2) must be added to 1,500 ml of water to produce a concentration of 1.33 m (molal solution)?

asked by Damon on July 20, 2016
97. ## chemistry

How many grams of hydrogen peroxide (H2O2) must be added to 1,500 mL of water to produce a concentration of 1.33 m (molal solution)?

asked by Anonymous on July 8, 2013
98. ## College Chemistry

A gas containing carbon and hydrogen analyzed as 85.6 % carbon and 14.4 % hydrogen. A 42.1 g sample of a gas occupied a volume of 7490 mL with a pressure of 2280.0 torr at 92 °C. Enter the molecular formula of the compound. Thanks.

asked by Lance on May 4, 2012
99. ## CHE1

Hydrogen peroxide decomposes to water and oxygen at constant pressure by the following reaction: 2H2O2(l) → 2H2O(l) + O2(g) ΔH = -196 kJ Calculate the value of q (kJ) in this exothermic reaction when 4.60 g of hydrogen peroxide decomposes at constant

asked by Karla on July 9, 2017
100. ## chemistry

Question: When a pink aqueous solution of potassium permanganate, faintly acidified with dilute sulfuric acid was treated with 10% aq. hydrogen peroxide, the reaction took place with the evolution of gas bubbles, and the pink solution was turned colorless.