November 24, 2015

Search: 14 carat gold has a purity of 58.3%. How many moles of gold are in 154 grams of 14 carat gold? Answer in

Number of results: 62,696

What mass of Helium will occupy 2 times the volume of 10.0 grams of Neon if both gases are measured at STP?
April 18, 2012 by Anna

determine the pressure that must be excreted on 200 grams of oxygen to contain it in a 2.oo l vessel at 30 degrees celcius
May 9, 2012 by Sean Lewns

college chemistry 2
if 20g of CaSiO3 is mixed with 15g of HF which of the two is the limiting reactant and how many grams of the other will be left
August 15, 2012 by Ernesto

If I react 150.0 grams of zinc II sulfate with EXCESS calcium Sulfide, what mass of product(s) will be produced?
August 15, 2012 by Heather

If I react 500.0 grams of calcium carbonate with EXCESS Hydrogen Chloride, what mass of products will be produced?
August 15, 2012 by Heather

What volume of a 0.164 M potassium hydroxide solution is needed to exactly neutralize 0.680 grams of KHP ?
October 7, 2012 by Kele

if a reaction vessel contains 11.5g NH3, 12.0g O2, and 10.5g CH4, what is the maximum mass in grams of hydrogen cyanide that could be made?
October 13, 2012 by robert

physical science
how much heat is absorbed by contacting 10 grams of 100 degree C steam by a students hand.
October 22, 2012 by Anon

Suppose you dissolve 10 grams of HCl gas in 250 ml of water initially at 25 C, what will the final temperature of the solution be?
October 24, 2012 by Rita

Ap Chemisty
If .237 mol of ammonia react with 56g of iodine, how much Nitrogen triiodid, in grams, is produced?
October 24, 2012 by Kelsey

How many grams of citric acid is needed to titrate 20ml NaOH 0.05M their mole ratio is 1:3 respectively
November 28, 2012 by Janet

How many grams of sodium hydroxide is needed to react with 100 ml of a 1.4 M nitric acid for complete neutralization to happen.
December 8, 2012 by maria

Chemistry I HN
If 720.0 grams of steam at 400.0 degrees Celsius absorbs 800.0 kJ of energy, what will be its increase in temperature?
January 1, 2013 by Cary

How many grams of Ni would be electroplated if a constant current of 7.2 amperes is passed through a solution of NiSO4 for 90.0 min?
March 19, 2013 by George

How many grams of silver will be produced on the reaction of 50.00g iron metal with an excess of a copper (ii) sulfate solution ?
March 25, 2013 by Maria

How many grams of H2SO4 are contained in 4.5 L of .30N (N standing for normality) sulfuric acid? Help would be much appreciated.
April 7, 2013 by Daniel

how many grams of sucrose must be dissolved in 1.5kg of water ot produce a solution which has a freezing point of -2.40 degrees C?
April 14, 2013 by Joan

How many grams of nitric acid (HNO3) must be dissolved in 740 mL of water to make a solution with a pOH = 8.3?
May 12, 2013 by Natasha

a grocery store sells vinegar in 1Lbottles. based on your results, how many grams of acetic acid are in a bottle?
May 13, 2013 by b

How many grams of gas are present in a sample that has a molar mass of 70 g/mol and occupies a 2 L container at 117 kPa and 35.1C?
May 13, 2013 by Dori

analytical chemistry
How many grams of H3BO3 and mL of NaOH (with concentration 0,1M) should you add, to get a 500mL buffer, with pH 9. pKa=9,236
July 30, 2013 by Maria

How many grams of NH3 are required to make 52.7g H2O in the following reaction : 4NH3+6NO->5N2+6H2O
September 28, 2013 by bob

How many grams of Ni(OH)2 are produced from the reaction of 25.0mL of a 0.600M NaOH solution? NiCl2(aq)+2NaOH(aq)→ Ni(OH)2(s)+2NaCl(aq)
November 4, 2013 by anatasya

Analytical chemistry
How many grams of solid CuSO4. 5H2O are needed to prepare a 500 ml of a 1000 ppm solution of Cu?
February 2, 2014 by Lori

if a college student went into the lab and produced 45 grams of Na2CO3, what is percent yield of this trial?
February 25, 2014 by jin

if you have 9.50x10^25 molecules of KClO3 how many grams of KCl and O2 will you get? The balanced equation is 2KClO3 = 2KCl + 3O2
April 6, 2014 by Emma

Chemistry 12
calculate the Ph of a solution composed of 0.75 grams of KOH dissolved in 500ml of water. assume total ionization.
June 27, 2014 by jeremy

Chem 2
4) Calculate the solubility of calcium hydroxide, Ca(OH)2 (Ksp = 5.5 x 10-5) in grams per liter in: a. Pure water b. 0.10 M CaCl2
July 29, 2014 by Jordan

How many mL of a 0.123 M aqueous solution of aluminum bromide, AlBr3, must be taken to obtain 7.77 grams of the salt?
November 18, 2014 by Danielle

If 45.5 g of calcium carbonate is reacted with phosphoric acid, how many grams of carbon dioxide will be produced if the reaction yield is 85.0 %?
November 25, 2014 by Jass

How many grams of oxygen gas must react to give 2.80g of ZnO? 2Zn(s)+O2(g)→2ZnO(s)
November 25, 2014 by McKenzie

how many grams of calcium bicarbonate would it take to reach a ph of 7 if i have 10ml 3 molar sulfuric acid?
February 10, 2015 by joe

how many grams of ammonium chloride are needed to raise the ammonia level 5 ppm in a 300 gallon system?
February 15, 2015 by Cyndy

Suppose 50.0 g NH3, 80.0 g CO2, and 2.00 mol H2O are reacted. Determine the maximum grams of NH4HCO3 that can be produced.
March 2, 2015 by Dianne

How many grams of oxygen gas must react to give 2.70g of ZnO? 2Zn(s)+O2(g)→2ZnO(s)
April 20, 2015 by danielle

what volume of 0.200M KOH is needed to neutralize 32.7 grams of h3po4, which has been dissolved in 250 ml water?
June 4, 2015 by Nick

148 mL of 0.325 M MgCl2 is mixed with 68.7 mL of 0.388 M NaOH and allowed to react completely. how many grams of Mg(OH)2 will form?
June 14, 2015 by walter

When 4.0 mol of CCl4 reacts with an excess of HF, 3.0 mol of CCl2F2 (Freon) is obtained. The equation for the reaction is CCl4(l) + 2HF(g) --> CCl2F2(l) + 2HCl9g) State which of the statements are true about the reaction and make the false statements true. (a) The ...
September 15, 2010 by Bree

Analysis of a compound indicates that it is 49.02% carbon, 2.743% hydrogen, and 48.23% chlorine by mass. A solution is prepared by dissolving 3.150 grams of the compound in 25.00 grams of benzene, C6H6. Benzene has a normal freezing point of 5.50degreeC and the solution ...
January 10, 2011 by Tracy

Analysis of a compound indicates that it is 49.02% carbon, 2.743% hydrogen, and 48.23% chlorine by mass. A solution is prepared by dissolving 3.150 grams of the compound in 25.00 grams of benzene, C6H6. Benzene has a normal freezing point of 5.50degreeC and the solution ...
January 10, 2011 by Tracy

Analysis of a compound indicates that it is 49.02% carbon, 2.743% hydrogen, and 48.23% chlorine by mass. A solution is prepared by dissolving 3.150 grams of the compound in 25.00 grams of benzene, C6H6. Benzene has a normal freezing point of 5.50degreeC and the solution ...
January 10, 2011 by Tracy

When 23.18 g of element A react completely with 48.08 g of E, compound A2E is formed. When 11.70 g of A react with 22.57 g of G, compound AG is formed. If elements E and G react to form EG3, what mass in grams of G is required to react with 12.97 g of E? The molar mass of E is...
January 14, 2007 by AJ

1. Evaluate. (8 – 3) (12 ÷ 2 • 2) – 20 Answer: I'm not sure if its -5 or 40 2. 6x – 7 = 5(x – 2) Answer: -3 3. Solve for y. 3x – 2y = 12 Answer: 3x-12/2 4. Solve. –3(x – 3) + 8(x – 3) = x – 9 Answer: 1 1/2 or 1.5 5. Find the slope of the line passing through the points (8, 3) ...
December 23, 2007 by Loreal

just wanted to check a few more questions... 1. Find the prime factorization of the number 20. Answer- 2x2x5 2. Find the greatest common factor of 30, 45, and 50. Answer -5 3. Complete the statement using the given property. 6 x (4 x 7) = Associative property of multiplication...
September 5, 2009 by A

Can you check these thanks part 1 directions: Exprimez d'une autre façon. 1. un télécopieur --------- Answer: un fax 2. une télécopie ------------ Answer: un fax 3. une texte ------------ Answer: ses données 4. elle ne perd pas ---------- answer: le sauvegarde 5. elle transmet...
January 26, 2010 by Grace

calculus ( Is there a simpler way to get answer?)
Given the functions: f(x) = x^2 - 1, g(x) = x/x + 2 Why is the followig the equation of (g o f)(x) THe answer is x^2 - 1 / x^2 + 1 This is how I got the answer with someone's help: Assume you forgot parenthese g(x) = x / (x + 2) g = x^2 - 1) / (x^2 - 1 + 2) = (x^2 - 1)/(x^2 + ...
September 28, 2008 by Erika

AP chem!!!
Iron ore consists mainly of iron III oxide. When iron III oxide is heated with an excess of coke(carbon), iron metal and carbon monoxide are produced. Assume that even if an excess of coke is not present that the reaction proceeds as described. A)write a balanced equation for ...
October 15, 2006 by Nicole

Verify these answers please. 1. Which of the following functions would f(x) = log(base 10)x horizontally 4 units to the left? a) f(x)=log(base10)(x-4) b) f(x)=4Log(base10)X c) f(x)=log(base10) x+4 Answer: C ------------------------------------ 2. State the transformations, in ...
January 29, 2012 by Melinda

Esta mañana nos (1) _____ temprano en carro sin mapa. Al (2) _____ de la ciudad, Jorge (3) _____ al empleado de una gasolinera dónde (4) _____ el carril para acceder a la autopista. El empleado no (5) _____ contestarle porque no (6) _____ a dónde (7) _____. Entonces, Jorge le...
September 25, 2015 by Matt

What is the work required to raise a 10. kg object from the surface of the Earth to a height of 2.0 m? 5.0 J 20. J 2.0 E2 J 2.0 E3 J My answer was 20. J but this was wrong. Is the answer 2.0 E2 J? A net force of 9.0 N acts through a distance of 3.0 m in a time of 3.0 s. The ...
October 22, 2009 by Hannah

Science Help!
A student mixed two clear liquids together in a beaker. A gas and a new liquid formed. The gas escaped, so the student was unable to measure its mass. She guessed that its mass was no more than 10.0 [LW1] grams. Her data is shown in the table below. Mass (g) Liquid reactant A=...
November 14, 2014 by Callie

An obstetrician maintains that preterm babies (gestation less than 37 weeks) have a higher variability of birth weight than do full-term babies (gestation 37-41 weeks). According to the National Vital Statistics Report, Vol. 48, No. 3, the birth weights of full time babies are...
March 7, 2011 by Rob

A 0.5215 gram sample of CaCO3 is dissolved in 12M HCl and the resulting solution is diluted to 250.0 mL in a volumetric flask. How many moles of CaCO3 are used?
April 28, 2009 by saddee

If you are given a .26g piece of sodium metal to react compltetely with water, how many moles of HCl would it take to neutralize the sodium hydroxide produced?
November 17, 2009 by Jmhitt

If 2.50 mol of copper and 5.50 mol of silver nitrate are available to react by a single replacement:Cu + 2AgNO3 -> Cu(NO3)2 + 2Ag What is the amount in moles of each product formed?
February 13, 2010 by Kara

chem 1406
Consider: C7 H16(L) + 11 O2 (G) yields 7 CO2 + 8 H2O (L) delta Hreaction = -4130 kJ How much energy is released when 2,000 moles of C7 H16 is combusted?
April 27, 2010 by laney

How much limestone (CaCO3) in kilograms would be required to completely neutralize a lake with a volume of 5.2 x 10^9L . The lake contains 5.0 x 10^-3 moles of H2SO4 per liter?
June 28, 2010 by seth

I stuck on this prob. Can you help me to do this? 10.00 mL of a solution containing 0.20 M NaCl and 0.25 M AlCl3 is introduced into a cation exchange column. How many moles of hydronium ions will be released by the column?
October 22, 2010 by Kim

Given the reaction: C8H16 + 12O2 --> 8CO2 + 8H2O How many moles of H2O are produced when 11.2 liters of C8H16 gas, measured at STP, reacts completely?
December 14, 2010 by Lori

Use the equation to determine what volume of nitrous oxide can be produced from the decomposition of o.55 moles of ammonium nitrate useing the equation: NH4NO3 (s)--> N2O (g) + 2H2O (g)
April 14, 2011 by Jane

Nitrogen and hydrogen gases are combined at high temperatures and pressures to produce ammonia, NH3. If 104.6 g of N2 are reacted with excess H2, how many moles of NH3 will be formed?
May 16, 2011 by olga

CHEM 111
Calculate the pH of the solution that results from the addition of 12.00mL of 0.225M HNO3 to 20.00mL of 0.210M NH3. Buffer titration problem. Do I find moles and then???
June 12, 2011 by Anonymous

Consider the balanced chemical equation: 3Sr(OH)2(aq) + 2H3PO4(aq) → Sr3(PO4)2(s) + 6H2O(l). How many moles of Sr(OH)2 remain if 0.10 mol of H3PO4 react with 0.40 mol of Sr(OH)2?
August 20, 2011 by Mike

How do we find the molar mass of a gas produced? Example if 1.00 kg of N2H2 reacts with 1.00kg of H202. How many moles of N2 could be formed? THe equation is N2H2+2H202 > N2 + 4H20
April 9, 2012 by Hero

What is the concentration of chloride ions (in) in a solution prepared by adding 0.075 moles of calcium chloride to 425 mL water,assuming no volume change up on mixing? Thanks!
April 23, 2012 by Wendy

A buffer system contains 0.25M NH4+ and 0.19M NH3. pka of NH4 is 9.25. How many moles of NaOH must be added to 1.00L of this solution to increase the pH to 9.25?
July 19, 2012 by June

How many moles of potassium hydroxide are required to neutralize 1.25 mol of phosphoric acid? H3PO4 + 3KOH -> K3PO4 +3H2O I got 0.42 mol KOH , is this correct? thanks!
May 8, 2013 by Anonymous

Chemistry. Please
If 15ml of 1M sulfuric acid is used until faint pink endpoint is reached how many moles of magnesium hydroxide are in 50ml solution. Please help
April 25, 2014 by Cassy

Determine the pH of a solution of 12.00 mL of 0.2 M acetic acid with 10 mL of a 0.025M NaOH? (Ka = 1.8E–5) I've calculated my excess moles of acetic to be .00215. Total volume being .022L. Where do I go from here? Thanks!
April 21, 2015 by Jessica

college math
Math homework please help!! 2. Suppose that people’s weights are normally distributed, with mean 175 pounds and a standard deviation of 6 pounds. Round to the nearest hundredth of a percent a. What percent of the population would weigh between 165 and 170 pounds? b. What ...
November 5, 2013 by lynda

Consider 3 liters of an ideal (monatomic) gas at a pressure of 34 atm and a temperature of 356K. Call this state of the system A. Using the ideal gas law, calculate the number of moles of gas present in the system. 3.49 The temperature of the system is reduced, keeping the ...
April 11, 2012 by anonymous

I'm about to do the second part of a Limiting Reagent laboratory tomorrow. There are a few questions that are giving me trouble on the pre-lab assignment. In the first lab period, we measured the amount of H2 gas produced in a reaction of Mg and 10 mL of 2.0 M HCl. We varied ...
March 11, 2009 by Jake

Gabe is the human resource manager for the Advanced Scientific Research Lab. He has to record the heights (in centimeters) and weights (in pounds) for each of the scientists in the lab. Height distribution (cm): 178, 163, 174, 186, 154, 167, 167, 181, 159, 165, 177, 191, 158 ...
February 18, 2014 by Dan

1. What is the mapping of? Domain Range -3 3 -2 -6 -1 0, 15 0 -6 1 -1 I needed to represent these with arrows, but I can't. a. relation b. linear function c. all of these d. none of these Answer- none of these 2. Re-write 2x - 3y < 6 in slope intercept format. Answer- y >...
August 7, 2011 by lizzie

Choose 1/ ashraf(willbe, is) 20 next week. Answer: will be 2/ i (will go, am going) to paris tomorrow as every thing is ready. Answer: will go 3/ he (is buying, is going to buy) this car next month as he planned. Answer: is going to buy 4/ i think he ( willcome, is coming with...
February 4, 2014 by Nawaf

How many moles of solid Ba(NO3)2 should be added to 300 ml of .2 M Fe(NO3)3 to increase the concentration of NO3- ion to 1 M?
October 3, 2007 by corey

Calculate the amount (in moles) of H₂O in 2.00g of Na₂CO₃ ⋅ 10H₂O. Thanks so much!!
October 8, 2011 by Erica

how many moles of Mg2+ and NO3(there is a negative sign on top of the 3 in NO3)form for each mole of Mg(NO3)2 that dissolves?
July 31, 2013 by mariana

An alpha particle (mass 6.6 x 10^-24 grams) emitted by radium travels at 3.4 x 10^7 plus or minus 0.1 x 10^7 mi/h. (a) What is its de Broglie wavelength (in meters)? (b) Whats uncertainty in its position? for part (a) I got 1.53 meters which said it was wrong on Aris and I got...
March 5, 2010 by Erin

Answer the follow using the Energy Profile plot. More than one answer is possible for some questions. What chemical species are present... A. at the longest constraint distance? (Use i, ii, iv, etc. for your answer) B. at the highest energy? (Use i, ii, iv, etc. for your ...
July 19, 2010 by Anth

MATH!+ check please~ thanks in advance!
the equation 2x^2+ cy^2+Dx+Ey+f= 0 represent a conic. state the value(s) of C for which each of the following are possible: A circle: My answer: c= 2 an ellipse: My answer: c>0, cant equal 2 Parabola: My answer:c=0 a hyperbola: My answer: c<o ( any negative number) are ...
March 23, 2007 by conics!?

algebra 1
select an appropriate unit from the choices below and connect the rate to that unit. answer a - ft /s answer b - mph answer c - mm/s answer d - km/s question : A person walking at 3,4 mph
October 15, 2015 by kamryn

Physics please check
Three moles of an ideal monatomic gas are at a temperature of 345 K. Then, 2531 J of heat are added to the gas, and 1101 J of work are done on it. What is the final temperature of the gas? delta U= 3/2nR(T final -T initial) (2531J - 1101J) = 3/2(3.0mol)(8.31)(T final - 345K) ...
April 15, 2007 by Mary

How many moles of NaOH must be added to 1.0 L of 1.4 M HC2H3O2 to produce a solution buffered at each pH? (a) pH = pKa mol (b) pH = 3.07 mol (c) pH = 5.15 mol
December 5, 2010 by justin

Need to write whether the verb in Transitive or Intransive. 1. John received a silver trophy. A=trans 2. The judge gave him a check for $100. A=trans 3. The contestants all played well. Answer=intrans 4. Thomas won a silver plate in a different competion. Answer=trans 5. Kim ...
March 29, 2011 by Emily

A 100.0 ml sample of 0.300 M NaOH is mixed with a 100.0 ml sample of 0.300 M HNO3 in a coffee cup calorimeter. Both solutions were initially at 35.0 degrees celcius; the temperature of the resulting solution was recorded at 37.0 degrees celcius. Determine the delta H (in units...
July 12, 2012 by jen

Why is the freezing point depression of potassium ethanoate greater than that of camphor or urea (in benzoic acid), with equal moles of each? Wouldn't the Kethanoate break up into two ions per molecule?
February 10, 2007 by Edward

Consider once again the magnesium nitride addition reaction from the previous question. This time, suppose you start with 10.0 g N2 and an unlimited supply of Mg. What is the maximum number of MOLES of Mg3N2 that could be produced in this case?
November 17, 2010 by cristy

Refer to the following equation: 4NH3 + 7O2= 4NO2 +6HO, How many moles of ammonia would be required to produce 11.9 mol of water? Can you please walk me through the steps on how to figure this problem?
March 16, 2012 by Jessica

The electrolysis of a water solution of H2SO4 produces, after a certain period of time, 20L of H2, (T=25° and P=1); calculate the amount of Coulomb necessary for the hydrogen production and the moles of molecular oxygen developed.
July 6, 2012 by Mousa

Use the data from this table of thermodynamic properties to calculate the maximum amount of work that can be obtained from the combustion of 1.00 moles of ethane, CH3CH3(g), at 25 °C and standard conditions. I absolutely have no idea what to do, please help me!
April 30, 2013 by Dee

Could someone correct my answers and help with the other problems? 1. Are the following lines parallel, perpendicular, or neither? L1 with equation x – 5y = 10, L2 with equation 5x + y = 5. Answer: Neither (I'm not to sure but i think this is the right answer) 2. Divide: a^10/...
May 27, 2007 by Timm

How many moles of aluminum are presented in a 0.856g sample of aluminum can? Assume that the can is pure aluminum.
October 10, 2014 by M

Calculate the molarity of a solution in which 0.75 moles of a solute are dissolved in 125g of solution (density of solution = 1.05g/mL). I don't even know where to begin.
April 29, 2008 by Lisa

A sample of 0.50 moles of gas is placed in a container of volume of 2.5 L. What is the pressure of the gas in torr if the gas is at 25 degrees C ? Show work ?
February 17, 2011 by Cat

Ethanol will combust according to the following equation: C2H5OH(l)+3O2(g)->2CO2(g)+3H2O(l) How many liters of air are required to combust 120.1 g of ethanol at 26.4C and 789.5 mmHg. Assume air is 21% O2 by volume. I cannot find my error - professor states answer as 882.6...
April 17, 2014 by Joe

I think the answer is wrong online so I would like to know what the correct answer is before I teach a student! If it takes 6 cubes to build 3 steps, how many cubes will be needed for 11 steps? It sounds so easy but my answer doesn't match the answer sheet. Thanks!
August 4, 2008 by Teacher

How many moles of excess reactant are present when 3.50 x 10^2 mL of 0.216 M sulfuric acid reacts with 0.510 L of 0.202 M sodium hydroxide to form water and aqueous sodium sulfate?
September 19, 2009 by larry

How many moles of excess reactant when 338mL of 0.226M sulfuric acid reacts with 0.493L of 0.211M sodium hydroxide to form water and aqueous sodium sulfate?
December 3, 2009 by Lindsey

I am having trouble with how to approach this problem. I have the solution but can't figure out how to get it. How many moles of NaOH must be added to 1.0 L of 2.0M HC2H3O2 to produce a solution buffered at each pH? a) pH=pKa b)pH=4 c)ph=5
April 12, 2010 by Larry

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