Number of results: 63,773

**chemistry**

Glycerin (C3H8O3) is a nonvolatile liquid. What is the vapor pressure of a solution made by adding 180. g of glycerin to 321 mL of H2O at 39.8°C? The vapor pressure of pure water at 39.8°C is 54.74 torr and its density is 0.992 g/cm3.

*May 4, 2010 by bob*

**chemistry**

Glycerin, C3H8O3, is a nonvolatile liquid. What is the vapor pressure of a solution made by adding 164 g of glycerin to 325 mL of H2O at 39.8°C? The vapor pressure of pure water at 39.8°C is 54.74 torr and its density is 0.992 g/cm3.

*February 12, 2011 by tay*

**chem**

Determine the volume of 0.240 M KOH solution required to neutralize each of the following samples of sulfuric acid. The neutralization reaction is shown below. H2SO4(aq) + 2 KOH(aq)--> K2SO4(aq) + 2 H2O(l) (a) 26 mL of 0.240 M H2SO4 thanks

*March 11, 2011 by Abby*

**Science**

Stacy has .55kg water sample at 1 atm pressure and 40 degrees celsius. She heats it to 90 degrees Celsius, maintaining constant pressure. How much heat was absorbed by the solution during the course of this operation? (CP of H2O (l) = 4.18 J/g )

*December 5, 2012 by Marketa*

**ap chem**

Bismuth can be electrolytically reduced according to the following reaction: BiO(+)+ 2H(+)+ 3e¯ >>> Bi + H2O How many grams of bismuth can be reduced by applying a 5.60 A current for 23.8 min. to a solution containing BiO+ ions (assuming 100% efficiency)?

*May 22, 2015 by Anonymous*

**chemistry**

The standard enthalpy of formation at 298k for ccl4,h2o,co2,hcl are -22.5,-57.8,-94.1 and-22.1 kcal/mol.calculate ▲rH FOR reaction ccl4+2h2o→co2+HCL

*March 1, 2015 by rakesh dhakal*

**Chemistry**

Calculate the pH of a solution that is 2.00 M HF, 1.00 M NaOH, and 0.704 M NaF. (Ka = 7.2 E -4)

*December 17, 2008 by Schanee*

**Chemistry**

Calculate [H3O] for a solution of hydrochloric acid that is: pH=2.00 pH=3.00

*April 26, 2009 by Gayla*

**College Chemistry**

Calculate both [H30] and [OH-] for a solution that is: pH=5.50 ph=7.00

*April 26, 2009 by Gayla*

**chemistry**

Calculate the pH of a 0.35 M solution of dimethylamine, (CH3)2NH.

*December 7, 2009 by donna*

**chemistry**

calculate the % m/m concentration of 2g sugar in 80g solution

*November 26, 2010 by faye*

**chemistry**

these is 0.1M HCl of 100ml of that solution in a beaker,calculate pH?

*February 12, 2011 by kabelo*

**Chemistry**

Calculate the concentration of OH¯ ions in a 1.4*10^-3 M HCl solution

*February 15, 2011 by Sara*

**chemistry**

Calculate the H3O^+ and OH^- ion concentrations in a solution that has a pH of 3.72.

*February 26, 2011 by Maria*

**Chemistry**

Calculate the molarity of 15.4 g of ethanol (C12H22O11) in 71.0 mL of solution

*February 27, 2011 by Kiana*

**Chemistry**

Calculate the concentration of all species in a 0.15 M KF solution. Ka = 6.4 x 10-4 for HF.

*February 27, 2011 by Brian*

**Chemistry**

Calculate the[OH-] of a solution of 0.1861M CH3CH2CH2NH3CL if Kb= 5.1*10-4 for CH3CH2CH2NH2

*April 16, 2011 by Jude*

**Chemistry**

I don't know why on earth I don't remember how to do this, but I can't, and it's so simple. Calculate [H+] and [OH-] of a solution with a pH of 9.7 Thank you.

*June 15, 2011 by Anonymous*

**chemistry**

Calculate the molality of a 10% H3PO4 solution in water.

*October 11, 2011 by Keva*

**Chemistry**

A 0.39 M solution of a weak acid is 3.0% dissociated. Calculate Ka.

*November 23, 2011 by Kaleen*

**Chemistry**

Calculate the pH of a 0.053 M (C2H5)2NH solution (Kb = 1.3 10-3).

*November 23, 2011 by Kaleen*

**chemistry**

Calculate the pH of a 0.063 M (C2H5)2NH solution (Kb = 1.3 10-3).

*November 24, 2011 by melissa*

**chemistry**

Calculate the pH of a 2.5x10-5 M lithium hydroxide solution.

*May 2, 2012 by Liz*

**Chemistry**

calculate [H] and [OH] for a .01M calcium hydroxide solution?

*May 20, 2012 by Morgan*

**Chemistry**

Calculate the pH of a solution at 25.0 °C that contains 1.94 × 10-10 M hydronium ions.

*November 16, 2012 by Josh G.*

**Chemistry**

Calculate the pH of a solution at 25.0 °C that contains 1.94 × 10-10 M hydronium ions.

*November 17, 2012 by JOHN*

**science**

Calculate pH of 0.01 M CH3COONa solution if pKa of CH3COOH is 4.74.

*January 7, 2013 by kartikaya*

**Chemistry**

Calculate the [H], [OH], pH and the pOH of this solution; 0.0025 M NaOH

*June 19, 2013 by Shane*

**CHEMISTRY**

CALCULATE THE MOLARITY OF 50.0g OF NaCL IN 7820mL OF SOLUTION

*December 4, 2013 by DAD*

**Chemistry**

Calculate the molarity of 17.g of NaCl in 881 ml of solution

*April 13, 2014 by Alexa*

**chemistry**

calculate the concentration of ammonium nitrate solution.

*August 17, 2014 by Anonymous*

**chemistry**

calculate the molarity of a g NaCl in 250 ml solution.

*November 25, 2014 by Zach*

**chemistry**

Calculate the pH of a saturated solution of Sr(OH)2. The Ksp for Sr(OH)2 is 3.2x10^-4.

*February 15, 2015 by Aly*

**chemistry**

Calculate the hydroxide ion concentration of a solution with pH = 8.25.

*March 11, 2015 by Ciaria*

**college chem**

Calculate the molarity of the solution: 42.6 g NaCl in 1.58 L

*July 19, 2015 by tonia*

**Chemistry**

A solution of NH3 in water has a pH of 11.17. Calculate it's molarity

*October 18, 2015 by Rita*

**Chemistry**

What is the osmolality of 1.1% NaCl salt solution? How can I calculate this?

*April 27, 2016 by Mirza*

**Science**

Calculate the molarity of 10 % HNO3 (w/w) solution if its density is 2.0 g/cc at 25° C.

*October 2, 2016 by satyam kar*

**chemistry**

Calculate the concentration of all species in a 0.20 M KF solution.

*March 7, 2017 by karen*

**Chemistry**

Calculate the pH after 0.14 mole of NaOH is added to 1.07 L of a solution that is 0.54 M HF and 1.15 M NaF, and calculate the pH after 0.28 mole of HCl is added to 1.07 L of the same solution of HF and NaF. 0.14 mole of NaOH 0.28 mole of HCl

*March 13, 2013 by Margaret*

**Chemistry**

At a certain temperature the vapor pressure of pure benzene is measured to be 322. torr . Suppose a solution is prepared by mixing 138.g of benzene and 91.2g of heptane . Calculate the partial pressure of benzene vapor above this solution. 3 sig figs! Steps/equations are ...

*April 11, 2012 by Elizabeth L.*

**chemistry**

The problem statement, all variables and given/known data When 5.00 g of NaOH(s) are added to 100 g of water using a calorimeter (with Cp = 493.24 J/K), the temperature rises from 25.0 to 37.5 °C. Calculate the molar heat of solution. NaOH(s)--->Na(aq)+OH(aq) Assume that ...

*November 14, 2012 by fufi*

**Chemistry ASAP**

Using a table of standard electrode potentials (such as the one in your textbook), calculate the standard cell potential for a cell made by placing a zinc electrode in a Zn2+(aq) solution which is connected by an electrolyte to a Ag+ (aq) solution containing a silver electrode...

*May 13, 2014 by Tyler*

**Chemistry**

A solution is prepared by mixing 0.12 L of 0.12 M sodium chloride with 0.22L of a 0.19M MgCl2 solution.What volume of a 0.22 M silver nitrate solution is required to precipitate all the Cl- ion in the solution as AgCl ?

*March 13, 2010 by Abril*

**college algebra (maths 112)**

To conduct a new experiment, a scientist needs a 23% salt water solution. How much of a 13% solution must be mixed with 45 quarts of a 32% solution to get the proper solution?

*February 24, 2011 by Anonymous*

**science**

solution A was prepared by dissolving 0.63g of HNO3 in 100cm3 solution. Solution B is a sodium calcium hydroxide solution of unknown concentration. state a balanced chemical equation for the reaction

*August 25, 2015 by Zoe*

**Chemistry**

A laboratory technician is required to prepare a quarter normal saline solution (0.22% w/v) from the stock normal saline solution. 1. What is the dilution factor required? I have 4-fold dilution - is that correct? 2. Ise this dilution factor to calculate the volume of stock ...

*December 14, 2010 by Korina*

**Chemistry**

The specific heat of a solution is X J/g*degreesC and its density is Y g/mL. The solution was formed by combining Z mL of solution A with Z mL of solution B, with each solution initially at J degreesC. The final temperature of the combined solutions is D. The heat capacity of ...

*April 2, 2010 by Fred*

**math**

A pharmacist wishes to mix a solution that is 6% Minocidil. She has on hand 60 ml of a 3% solution and wishes to add some 8% solution to obtain the desired 6% solution. How much 8% solution should she add?

*January 17, 2012 by Hali*

**chemistry please help!!**

For the reation: C3H8+5 02 =3 CO2+4 H2O How many moles of C3H8 are needed to make 3.60 grams of H2O? I think the ans is 0.05 moles c3h8

*October 25, 2010 by Lillian*

**Chem**

1) A saturated solution of the slightly soluble salt MA3 is 1.4 ×10^–3 M in MA3. What is its Ksp value? 2) A 20.0 mL sample of NaIO3 was treated with an excess of KI and HCl and the iodine produced titrated with 0.05125 M Na2S2O3. 19.35 mL of Na2S2O3 solution were required ...

*November 8, 2015 by Brad*

**Chemistry**

1) A saturated solution of the slightly soluble salt MA3 is 1.4 ×10^–3 M in MA3. What is its Ksp value? 2) A 20.0 mL sample of NaIO3 was treated with an excess of KI and HCl and the iodine produced titrated with 0.05125 M Na2S2O3. 19.35 mL of Na2S2O3 solution were required ...

*November 9, 2015 by Brad*

**chemistry**

A solution contains 4.44% by mass of NaI in water. Calculate the molarity of the NaI, if the density of the solution is 1.2711 g mL-1. i got the answer to be 8.48 M... the percent mass is irrelevant information, right? i figured out the answer just by the given density alone.

*November 11, 2007 by keely*

**Algebra**

For the following equation, state the value of the discriminant and then describe the nature of the solutions. -7x^2+3x-4=0 What is the value of the disriminant? Does the equation have two imaginary solutions, two real solutions, or one real solution?

*March 2, 2009 by Sam*

**Inorganic chemistry**

Calculate E naught cell for the reaction b 5Cd(s) + 2MnO4-(aq) + 16H+(aq) ==> 5Cd^2+(aq) = 2Mn^2+(aq) + 8H2O(l) given the following standard reduction potentials MnO4^-(aq) + 8H^+(aq) = 5e^- ==> Mn^2+(aq) + 4 H2O(l) E naught = +1.52V Cd^2+(aq) + 2e^- ==> Cd(s) E ...

*April 11, 2009 by Steve*

**Chemistry**

2 H2S (g) + SO2 (g) <===> ƒnƒn3 S (s) + 2 H2O (g) 1) At 298 K, the standard enthalpy change, H¢X, for the reaction represented below is -145 kilojoules. (a) Predict the sign of the standard entropy change, S¢X, for the reaction. Explain the basis foryour prediction...

*April 29, 2008 by JJ*

**chemistry**

Ammonium carbonate decomposes upon heating according to the following balanced equation: (NH4)2CO3(s)-->2 NH3(g)+CO2(g)+H2O(g) Calculate the total volume of gas produced at 25 C and 1.07atm by the complete decomposition of 11.86 g of ammonium carbonate.

*April 16, 2010 by jason*

**Chemistry**

Ammonium carbonate decomposes upon heating according to the following balanced equation: (NH4)2CO3(s)-->2 NH3(g)+CO2(g)+H2O(g) Calculate the total volume of gas produced at 25 C and 1.07atm by the complete decomposition of 11.86 g of ammonium carbonate.

*April 16, 2010 by Zoe*

**Chemistry**

Ammonium carbonate decomposes upon heating according to the following balanced equation: (NH4)2CO3(s)-->2 NH3(g)+CO2(g)+H2O(g) Calculate the total volume of gas produced at 25 C and 1.07atm by the complete decomposition of 11.86 g of ammonium carbonate.

*April 16, 2010 by Zoe*

**Chemistry**

Using standard enthalpies information, calculate the standard enthalpy change for this reaction: a) (thermite reaction) 2Al(s) + Fe2O3(s) = Al2O3(s) + 2Fe(s) b) Mg(OH)2(s) = MgO(s) + H2O(I) c) N2O4(g) + 4H2(g) = N2(g) + 4H2O(g) d) SiCl4(I) + 2H2O(I) = SiO2(s) + 4HCI(g)

*July 3, 2014 by Brett*

**Chemistry**

Using standard enthalpies information, calculate the standard enthalpy change for this reaction. a)(thermite reaction) 2Al(s) + Fe2O3(s) = Al2O3(s) + 2Fe(s) b)Mg(OH)2(s) = MgO(s) + H2O(I) c)N2O4(g) + 4H2(g) = N2(g) + 4H2O(g) d)SiCl4(I) + 2H2O(I) = SiO2(s) + 4HCI(g)

*July 3, 2014 by Dan*

**college chem**

Calculate the molar enthalpy of reaction standard enthalpy of formation below. H20 = -285.8 kj/mole H+ = 0.0 kj/mole OH- = -229.9 kj/mol H+(aq) + OH-(aq)→H2O(l) For this, don't you do the summation of products x stoichemtry + the sum of reactants x stoich. from there I'm...

*November 20, 2014 by sam*

**Chemistry**

a domestic cleaner contains concentrated hydrochloric acid as the active ingredient. a titration experiment was carried out to determine the concentration of hydrochloric acid in the domestic cleanser. 20.0mL of the cleanser were diluted to 250.0mL with distilled water. 25.0mL...

*December 26, 2016 by Darth Chan*

**Calculus!!**

Consider the differential equation given by dy/dx = xy/2. A. Let y=f(x) be the particular solution to the given differential equation with the initial condition. Based on the slope field, how does the value of f(0.2) compare to f(0)? Justify your answer. B. Find the particular...

*April 23, 2016 by Anonymous*

**science**

Concentrated sulfuric acid (18.4 molar H2SO4) has a density of 1.84 grams per milliliter. After dilution with water to 5.20 molar, the solution has a density of 1.38 grams per milliliter and can be used as an electrolyte in lead storage batteries for automobiles. 1. Calculate ...

*October 24, 2007 by raksha*

**Chemistry**

K2O + H2O ==> ? KOH?? But it cannot be balanced. So would the product be KOH when K2O is dissolved in H2O? Thanks you!

*May 31, 2009 by Anonymous*

**chemistry**

what are the acids, bases, conjugated nacids and conjugated bases of the equation H2O+H2O->OH-+H3O?

*May 5, 2011 by jacob*

**Chem**

@20 degree solubility-22g Cu SO4/100g H2O @ 20 degree C is 6g Cu SO4/25 g H2O saturated?

*December 2, 2011 by Tammy*

**chemistry**

A sample of water is known to contain 1.51 × 10^24 H2O molecules. How many moles of H2O molecules are present in the sample?

*March 22, 2016 by Dave*

**Math**

1. Is the equation true, false, or open? 4y 8 = 6y + 3 2. Which value is a solution of the equation 2 - 8x = -6? 3. Which ordered pair is a solution of the equation y - x - 4? 4. Which ordered pair is a solution of the equation y = 4x? 5. Which ordered pair is the solution of ...

*November 29, 2016 by Robin Kwan*

**Math**

Determine the solution to the initial value differential equation: y′+2*y^2*e^(5*x)= 0 y(0)=2

*October 21, 2009 by AK*

**algebra**

I want to make sure that I understand how to do this problem. What is the value of x if 3/2x-2=15 + x? Would the solution be 2/9?

*May 27, 2010 by anonymous*

**math**

state the value of the discriminant and the discribe the nature of the solution 20x^2-8x-17=0

*August 29, 2010 by marie*

**math**

Use the intermediate value theorem to verity that x^4+X-3=0 has a solution in the interval(1,2)

*October 10, 2010 by Anonymous*

**math**

for each inequality tell whether the given value is a solution. a.x+8 > 15 x=4 b. 6x __<_ 30 x= -8 c. 4y-7<12 y=-1 d. z+2 _>__4+3z z=2

*January 4, 2011 by kattie*

**algebra2**

What is the value of x in the solution to the system y = 4x + 3 and 3x + 2y = -16? (Round to the nearest integer if necessary.)

*February 1, 2011 by meghan*

**MATH**

Find the solution of the given initial value problem. ty'+(t+1)y=t y(ln2)=0 t < 0

*February 22, 2011 by ALEX*

**calculus**

Please help find the solution to the initial value problem dy/dx=(1+2cos^2 x)/y with(y>0), and y=1 when x=0. Thanks.

*April 29, 2011 by John*

**chemistry**

What will be value of molarity and strength %w/v respectively 30V H2O2 solution

*August 23, 2011 by Aayush*

**mathematics please help!**

For what value of k does the system below not have a unique solution? -1x + 7y + 2z = 6 2x + 1y + kz = -11 3x - 6y - 2z = -25 A.5 B.0 C.-2 D.-8

*July 22, 2012 by True*

**math help please**

For the following system of equations, what is the x-value of the solution? –x + 2y = 6 6y = x + 18 A.-18 B.0 C.-6 D.3 I think its B??

*November 24, 2012 by Deborah*

**Science**

A solution has been prepared by dissolving 0.63 g of HNO3 in 100 ml.What is its pH value ?

*December 8, 2016 by Anindita*

**chemistry**

An ideal solution contains 40 mole % of A and 60 mole % of B at 80 degrees C. The vapor pressure of pure A and B at this temp are 480 torr and 890 torr. Calculate the vapor pressure of the solution.

*October 7, 2010 by Anonymous*

**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.)

*November 19, 2014 by Anon*

**Chemistry**

Calculate the concentration of chloride ions in the following solution. 73.28g of sodium chloride in 862. mL of solution. would it be 73.28g x 2 / 58.44g NaCl = 2.50 mol of Cl 2.50 mol Cl / .862 L = 2.91 M Cl

*September 18, 2016 by Anonymous*

**Chemistry**

Calculate DeltaHrxn for the following reaction: C + H2O --> CO + H2 Use the following: C + O2 --> CO2 DeltaH = -393.5 kJ 2CO + O2 --> 2CO2 DeltaH = -566.0 kJ 2H2 + O2 --> 2H2O Delta H = -483.6 kJ DeltaHrxn = ?

*March 20, 2012 by Chemistry*

**Chemistry**

The balanced equation for the decomposition of sodium bicarbonate is 2 NaHCO3 (s) --> Na2CO3 (s) + H2O (g) + CO2 (g)delta H 129.2. Using the enthalpies of formation, calculate the enthalpy of formation of sodium bicarbonate.

*April 30, 2013 by Laura*

**Chemistry**

10.5g of zinc was heated to a constant mass and the residue treated with excess Hcl: ZnCo3+Hcl-----ZnCl2+Co2+H2O. Calculate the mass of zinc chloride that would be obtained

*April 1, 2016 by Peace*

**Chemistry (Check)**

Completion. struggling with this....I got 1) 2)Precision 3)experimental value 4) 5) The ___1___ of a measurement describes how close the measurement comes to the true value. The ____2___ of a measurement depends on its reproducibilty. An ___3___ is a value measured in the lab...

*January 14, 2007 by Bryan*

**Organic Chemistry - Extraction**

You have 100 mL of a solution of benzoic acid in water; the amount of benzoic acid in the solution is estimated to be about 0.30 g. The distribution coefficient of benzoic acid in diethyl ether and water is approximately 10. Calculate the amount of acid that would be left in ...

*October 3, 2010 by Camille*

**chemistry**

When 0.752 g of Ca metal is added to 200.0 mL of 0.500 M HCl(aq), a temperature increase of 12.2C is observed. Assume the solution's final volume is 200.0 mL, the density is 1.00 g/mL, and the heat capacity is 4.184 J/gC. (Note: Pay attention to significant figures. Do not ...

*February 9, 2007 by nickel*

**Chemistry**

How many liters of gasesous methane (CH4) must be burned in oxygen to produce enough H2O and CO2 to fill a 3.0 L balloon? Assume that H2O and CO2 are the only combustion products and that the temperature and pressure remain constant. How would I solve this? Attempt: 3.OL (1 ...

*August 29, 2010 by Amy~*

**Algebra**

2. Find the value of x^3 + 2x^2 - 3 when x=3 Answer-42 4. Compare the quantity in Column A with the quantity in Column B. Column A Column B The solution of The solution of 2(x-3) = 6x 3x + 2 + 5x + 6

*August 7, 2011 by lizzie*

**Chemistry**

CaCl2(s) Ca2+(aq) + 2 Cl-(aq) H = -81.5 kJ A 14.0 g sample of CaCl2 is dissolved in 130. g of water, with both substances at 25.0°C. Calculate the final temperature of the solution assuming no heat lost to the surroundings and assuming the solution has a specific heat ...

*November 10, 2007 by Joe*

**chemistry**

A solution is prepared by mixing 0.0400 mol CH2Cl2 and 0.0800 mol CH2Br2 at 25 degrees C. Assume solution is ideal, calculate the composition of the vapor (in terms of mole fractions) at 25 C. At 25 C, vaporpressure of pure CH2Cl2 and pure CH2Br2 are 133 and 11.4 torr.

*March 7, 2010 by Sara*

**Chemistry**

A student mixes 100.0 mL of 0.300 mol/L silver nitrate solution with 100.0 mL of 0.300 mol/L calcium chloride solution. a) Determine the theoretical yield of the precipitate. b) If the actual mass of precipitate is 4.00g, calculate the percent error of this experiment.

*January 8, 2011 by Rebekah*

**Chemistry**

A student mixes 100.0 mL of 0.300 mol/L silver nitrate solution with 100.0 mL of 0.300 mol/L calcium chloride solution. a) Determine the theoretical yield of the precipitate. b) If the actual mass of precipitate is 4.00g, calculate the percent error of this experiment.

*January 8, 2011 by Rebekah*

**Chemistry**

One half-cell in a voltaic cell is constructed from a silver wire electrode in a .25 M solution of AgNO3 . The other half-cell consists of a zinc electrode in a .001 M solution of Zn(NO3)2. Calculate the cell potential I have no idea and am so stressed, Help please

*November 18, 2015 by Anonymous*

**Chemistry**

The cell Pt|H2(1 bar)|HCl(m)|AgCl(s)|Ag has an Stadard elctrode potential value of 0.2224V at 298K Using the Nernst equation, calculate a value for the EMF when the HCl concentration is 0.20M. I know what the Nernst equation is but I am unsure how to use it when I only have ...

*January 14, 2009 by Alice*

**Math help**

1. Which value is a solution of the equation 5 - 4x = -3 0 2 -3 1/4 2. Which ordered pair is a solution of the equation y = x - 4 (2, 6) (6, 2) (-2, 6) (3, -1) 3. Which ordered pair is a solution of the equation y = 3x (-2, -9) (-8, -18) (-8, -3) (-10, -30) 4. Which ordered ...

*October 15, 2013 by Charlotte*