CHEMISTRY (WEBWORK)

58,662 results, page 86

chemistry

How do you calculate the weight of the following compounds? A)H2O2 B)C6H8O6 C)K2Cr2O7 D)C56H88O2

chemistry

How do you find the rate(mole rxn/L s) from .00014 M or Iodine, .57 M or acetone, and .18 M of H+ and 16.8 seconds?

Chemistry

what is the percent by mass of oxygen in propanal, CH3CH2CHO? the answer is 27.6 %. but i need to know why, please help !

Chemistry

Compare and Contrast the atomic theories proposed by Democritus and John Dalton.

chemistry

Which of the following contains ionic bonding? H2O2 PO33- P2O5 AlCl3

Chemistry

how to figure The grams of protein in 1 cup of soup that has 98 {\rm Cal} with 6 {\rm g} of fat and 8 {\rm g} of carbohydrate

chemistry

what mass of K2SO4 would you measure out to prepare 550 mL of a 0.76 M solution?

Chemistry

What is the concentration of a solution of 1.70 g of AgNO3 dissolved in enough water to make 250 mL?

College Chemistry

Molarity of .100 mole of urea (CH4N2O) in 250.0 mL of solution

Chemistry

Kc=1. The initial concentrations are A = 0M, B = 0M, C=10M. A+B --> C calculate the reaction quotient. (c)/(a)(b) = 10/0 .. is the answer zero?

AP Chemistry

What is the chemical equation that corresponds to the standard molar enthalpy of formation of N2O?

chemistry

calculate the volume of amonia that is produced at stp when 10.5 grams of N2 reacted with excess H2.

chemistry

calculate the volume of amonia that is produced at stp when 10.5 grams of N2 reacted with excess H2.

chemistry

What is the molar concentration of calcium hydroxide that has 0.185g solute in 100ml solution?

Chemistry

How many grams of potassium carbonate are needed to make 0.200 L of a 2.50M solution?

general chemistry

Calculate the de Broglie wavelength (in pm ) of a hydrogen atom traveling 445 m/s.

chemistry

why is it recommended to carryout iodometric titrations as quickly as possible and to get the first endpoint

Chemistry

If you were given 0.021 milligrams of the compound,H3PO4, what would the mass of H in the sample be?

Chemistry

Explain which atom of the following pair have the smaller ionization energy: As, I

Chemistry

Is it true that: An isotope has a different number of neutrons than protons in the nucleus of its atom.

Chemistry

Zn(s) + 2 HCl(aq) H2(g) + ZnCl2(aq) When 25.0 g of Zn reacts, how many L of H2 gas are formed at STP? 1. 0.382 L 2. 0.0171 L 3. 22.4 L 4. 8.56 L 5. 4.28 L

chemistry

What is the molar concentration of calcium hydroxide that has 0.185g solute in 100ml solution?

chemistry

How many grams of Lead (II) Nitrate are required to make a 350mL solution of 2.5M Pb2+?-

Chemistry

A brownie contains 1.30 ×102 mg of sodium. What is this mass equivalent to it in units of grams?

chemistry

What volume of 0.406 M KOH is required to completely react with 18.50 mL of 0.287 M H2SO4?

Chemistry

Write an equation for the reaction that takes place when LiOH is added to water.

Chemistry

Is there a reason for why you're allowed only three significant figures for molar masses?

chemistry

calculate the number of grams atom and gram molecules in 25.4milligrams of iodine ?

chemistry

draw the electronic configurationd for; 1.Iron chloride,2. Aluminium oxide,3. Benzene

Organic Chemistry

What is the major product from the sulfuric acid and Hg(II)-catalyzed hydration ethynylcyclohexane?

Chemistry

how many grams of potassium dichromate are needed to make 250 mL of a 0.75 molar solution?

Chemistry

how many grams of potassium dichromate are needed to make 250 mL of a 0.75 molar solution?

Chemistry

How many grams of CH3COOH are present in 2.5^3 of vinegar. Also, what is the formula needed to solve? Thanks!

chemistry

What is the concentraton of a solution made by dissolving 0.5 moles of solute in 9.0 liters of water?

chemistry..

to drbob222 ok, the pka (hclo) = 7.54 the ph = 7.35 this problem was under "preparing a buffer" section

chemistry

how do you predict the products of: (NH4)3PO4+ MgSO4-> HI-> Fe+o2-> Fe+ MgO-> HCl+ NaOH->

organic bio chemistry

how many mL of a 0.20M KOH solution is needed to neutralize 25 mL of 0.25 M H2SO4?

chemistry

How many grams of water should you add to 31.0g of sucrose,C12H22O11, to get a 0.855 m solution?

Chemistry

Why is potassium hydrogen phthalate (KHP) a primary standard but sodium hydroxide is not?

Chemistry 12

Will a precipitate form if equal volumes of 0.22 M NH4NO3 and 0.22 M KBr are combined? Explain.

chemistry

how many molecules of water in order to produce 37 grams of oxgen? give me the Formula

chemistry

What is the molar concentration of calcium hydroxide that has 0.185g solute in 100ml solution?

chemistry

With a half-life of 14.3 years, how long will it take for100 g of phosphorus32 to decay to 12.5 mg?

chemistry

2P(s) + 3Cl2(g) --> 4PCl3(l) What is the vapor pressure of PCl3 at 298K? Show Calculations.

Organic Chemistry

How many grams of 2-propanol are expected from the complete reaction of 111 g of propene?

chemistry

what mass in grams of sodium nitrate is needed to make 85.o ml of a 0.2500 m solution

chemistry

What has the lowest surface tension and why? CH3CH2CH2CH3, (CH3)2CO, C6H6, H20

chemistry

How many mL of 5.00% (w/v) solution are needed to make 100mL of physiologic saline (0.90%(w/v) sodium chloride)?

chemistry

determine the quantity of NaOh whose percentage is 15 % to balance 176 g of H2SO4

chemistry

What is the molar concentration of calcium hydroxide that has 0.185g solute in 100ml solution?

Chemistry

Calculate the number of moles in these quantities. 1. 25.0 g KNO3 2. 5.4 x 102 g (NH4)2C2O4

Chemistry

I have 5.0 ml of lead II NITRATE and mix it with 20.0 ml of Sodium Iodide. what is the formula of the precipitate

chemistry

How many grams of water are present in 0.500 moles of calcium sulfate hemihydrate?

AP Chemistry

what is the procedure and materials needed to make a 0.10m solution of Potassium Hydroxide?

AP Chemistry

what are the procedures and materials needed to make a 0.10m solution of Silver(I) Chloride?

Chemistry

a.) 2KClO3 (s)-------> 2KCl(s) + 3O2(g) b.) 4NH3(g) +6NO(g) ---------> 5N2 (g) +6H2O(g) c.) 4K(s) + O2(g) ------> 2K2O(s)

Chemistry

How many atoms of each element are present in five formula units of calcium permanganate?

chemistry

would you expect lead chloride to dissolve in dilute HNO3? Explain

chemistry

is it possible to have an acid/base reaction and produce a precipitate as a product as well?

chemistry

volume in liters of oxygen produced at STP when 57.4g of hydrogen peroxide decompose

chemistry

calculate the mass of CO2 obtained when HCL reacts with 15g CACO3.

chemistry

what mass of (NH4)SO4 is required to prepare 500 cm3 of M/4 solution?

Chemistry

what intermolecular forces are present in each: Potassium nitrate, Naphthalene, and benzoic Acid?

chemistry

At what temperature (from your graph) do KNO3 and NaCL have same molar solubility?

Chemistry

What is the pH of a solution that results from the addition of 5mL of 0.1 M HCl to 50mL of pure water?

chemistry

what is the solubility of potassium nitrate (KNO3) in 100.0g of water at 80.0 degrees celcius?

chemistry

i start with 10 g of zinc. I have 12.5 mass of oxide formed. How the reaction will increase

Chemistry

Sodium carbonate(aq) + hydrofluoric acid(aq) ? What is the formula for the complete chemical equation?

chemistry

which solution would have a high vapor pressure 6.0 M NaCl or 3.0 M LiCl?

chemistry

which solution would have a high vapor pressure 6.0 M NaCl or 3.0 M LiCl?

chemistry

What is the mass of 3 moles of barium? Round to the nearest tenth. Don't forget the units.

CHEMISTRY

In the emission spectrum of hydrogen what is the wavelength of the light emitted by the transition fro m n = 4 to n =2.

chemistry

How much Fe3O4 is produced when 50g of Fe is reacted with exess water vapor

Chemistry

If 290 Liters of carbon dioxide forms, how many grams of nitroglycerine exploded?

chemistry

How much hydrogen gas (H2) forms when 54 g of aluminum reacts with excess HCI ?

Chemistry

If 40 g of KNO3 is dissolved in 100 mL of water at 25 degrees celisus, what will the final temperature be?

Chemistry

how many grams of solid KOH is needed to neutralize 1.00 L of 0.250 M HNO3 solution?

Chemistry

Calculate [OH-] and pH for the following strong base solution: 10.0 mL of 0.0105 M Ca(OH)2 diluted to 500.0 mL

Chemistry

What is the theoretical yield of aspirin if you have 2g of salicylic acid and 5 ml acetic anhydride?

Chemistry

Estimate the enthalpy change for the following reaction OH(g)+CH4(g)==>CH3(g)+H2O(g)

chemistry

How many liters of hydrogen will be produced by the decomposition of 59 grams of dihydrogen dioxide at STP?

chemistry

What is the pH of a solution made by adding grams of NH4Cl, to 550 mL of 0.205 M NaOH?

chemistry

Determine the pressure when it expands to 10 liters, from a 5 liter ballon at 1 atm and 150k.

chemistry

A ^232Th source is rated at 42 curies. How many thorium atoms disintegrate in 10 minutes?

Chemistry

I need to know the most polar bond in each molecule. HSCH2CH2OH / HC12F / HOCH2CH2NH2

Chemistry

I need the structural formulas for the organic compound trans 3,4,5-triethyl-2-octyene

Chemistry

I need the name of the following compounds using the IUPAC method: O CH2CH3 O || | // / \/ \/ \ OH

Chemistry

I need to know the most polar bond in each molecule. HSCH2CH2OH / HC12F / HOCH2CH2NH2

chemistry

what is the meaning of the numeral represented by X in the general formula for hydrate salt * XH2O

10th grade chemistry

How many grams of CuSO4.5H2O are needed to prepare 100. mL of a 0.to M

Chemistry

How do I balance the following into an equation? 10 mL of 2.0 M HCl is react with 8 mL of 1.7 M Ca(OH)2 in a neutralization reaction.

chemistry

how many grams of glucose C6H12O6 would you need to make 250 mL of 1.0 M solution?

chemistry

predict the type of reaction that occurs between liquid pentanol and oxygen.

Chemistry

How to determine the energy in J calories and K to convert one pound of ice to steam

Chemistry

What is the pressure exerted by a .500 mol sample of nitrogen in a 10.0L container at 20C?

Chemistry

Entropy both increases and decreases when you build a jigsaw puzzle. How is this possible?

Chemistry

I don't get this problem... 6.0 N H2SO4 = ________ M How can you solve for Molarity without mL? Thanks, much appreciated!

Chemistry

@ 20 degrees C is 6g CuSO4 in 25g of H2O saturated or unsaturated? How do I figure this out?

Chemistry

What mass of K2SO4 would you measure out to prepare 550mL of a .76 M solution?

Chemistry

How many grams of ethylene glycol, HOCH2CH2OH, are present in 5.3 gallons of a 5.22 m solution with a density of 1.83 g/mL?

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