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April 30, 2016

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: 66,088

VCU
Physical Sciences: what is the density of a piece of wood that has a mass of 25.0 grams and a volume of 29.4 cm3?
November 9, 2015 by Debbie

Chemistry
how much heat is required to warm 225 grams of water from -50c to 200 c
November 9, 2015 by Bob

Chemistry
If you want to prepare 2.0 liters of a .25 M solution of NH4Cl, how many grams of the salt should you weigh out?
November 29, 2015 by J

Physical Science
Which SI unit is used to measure length? A. meters B. newtons C. grams D. liters
February 9, 2016 by Sally

Chemistry
How many grams of salt can be made from a 5-gram sample of sodium combined with unlimited bromine?
February 15, 2016 by Anonymous

Math
A piece of cable 85 cm long weighs 52 grams. What will a 10cm length of th same weigh?
March 3, 2016 by Kimberly

Chemistry
How many grams of potassium nitrate, KNO3 are required to make 250 mL solution with a molarity of 0.40 M?
March 21, 2016 by Veronica

Chemistry
Calculate the solubility (in grams per 1.00×10^2 mL of solution) of magnesium hydroxide in pure water.
March 28, 2016 by Salma

Chemistry
How much NACl do i need to dissolve in grams to make 0.9%solution of 0.25l saline
April 1, 2016 by Kasey

chemestry
Given the following chemical equation, determine how many grams of N2 are produced by 9.72 g of H2O2 and 6.53 g of N2H4
April 13, 2016 by lex

Chemistry
To completely react 17g of barium hydroxide, how many grams of hydrochloric acid is needed?
April 19, 2016 by Ellen

math
You have a box which contains only red marbles and blue marbles. The mass of one red marble is 16 grams, while the mass of one blue marble is 20 grams. If the box contains 21 red marbles and 18 blue marbles, what is the total mass of the marbles in the box?
September 5, 2014 by Abdul

French
Part 3: Encore des questions: Faites des questions directes avec les phraes de l'activité 10 (from previous part 2 post) 1. ----------- intéresse Paul? Answer: Qu'est-ce qu' 2. ----------- lui est arrivé? Answer: Qu'est-ce qui 3. --------- il a compris? Answer: Qu'est-ce qu' 4...
September 19, 2010 by Missy

Chem
Nitric acid is produced commercially by the Ostwald process, represented by the following equations: 4NH3(g) + 5O2(g) > 4NO(g) + 6H2O(g) 2NO(g) + O2(g) > 2NO2 (g) 3NO2(g) + H2O(l) > 2HNO3(aq) + NO(g) What mass of NH3 must be used to produce 1.0x10^6 kg HNO3 by the ...
January 26, 2007 by Shawn

Chemistry
Benzene has a vapor pressure of 100.0 Torr at 26°C. A nonvolatile, nonelectrolyte compound was added to 0.309 mol benzene at 26°C and the vapor pressure of the benzene in the solution decreased to 60.0 Torr. What amount (in moles) of solute molecules were added to the benzene...
February 15, 2010 by Angelica

Chemistry
Hi DrBob, Sorry about that, I wasn't very clear! Can someone please help me complete these calculations for my lab; I am having some trouble. A. Standardization of Na2S2O3 -Mass of KIO3 in 100mL = 0.09600g -Calculate Molarity of KIO3= ? Please check: 0.09600g/(214.0g/mol)=4....
March 6, 2011 by Bryant

Mathis
Fiona is dissatisfied with her current weekly salary. If she received a raise of $0.50 per hour and worked an additional 4 hours each week her weekly salary would then be $500. What is Fiona current salary a) $380 b)$400 c)$420 d)440 e) not e ought information I put d can you ...
August 21, 2013 by Roger

accounting, correction
Can someone correct these for me thanks I'll appreciate it very much.... Identify whether a debit or credit yields the indicated change for each of the following accounts: a. To increase Store Equipment My answer: Debit b. To increase Owner Withdrawals My answer: Credit c. To ...
November 1, 2007 by student acc

Chemistry
"How many moles of oxygen are required to react completely with 5 mol C(8)H(18)?" 2C(8)H(18) + 25O(2) => 16CO(2) + 18 H(2)O In the question, how do I know if "oxygen" means the molecule O(2) or the element O?
September 21, 2010 by Gray

Chemistry
What minimum number of moles of NH4Cl must be added to 1.0 liter of solution that is 0.10 M in Mg(NO3)2 and 1.0 M in NH3 to prevent precipitation of Mg(No3)2?
October 24, 2010 by Ana

chemistry
A piece of iron(10)moles was dissolved in contrated Hcl.the reaction was form H2 and Fecl2. determine the amout of Fecl2 formed.
October 26, 2010 by tamaica

Chemistry
What is the total kinetic energy of 1.70 moles of nitrogen gas at 30 celsius? Please explain step by step by providing formula.
October 31, 2010 by Sarah

chem
Calculate the number of moles of the indicated ion present in each of the following solutions. Na+ ion in 1.20 L of 0.183 M Na2SO4 solution = ?mol
December 1, 2010 by shawn

chem
The volume of an adult's stomach ranges from about 50 mL when empty to 1 L when full.If its volume is 500 mL and its contents have a pH of 2, how many moles of H+ does it contain?
February 27, 2011 by Anonymous

chemistry
For the reaction 2Al+3CuSO4->Al2(SO4)3+3Cu a maximum of ? moles of CO2 could be formed from 6.5 mol of C6H6 and 4.56 mol of O2.
August 30, 2011 by Yep

Chemistry!
a microwave oven uses electromagnetic radiation with a wavelength of 3.00x10^6 nm. calculate energy (in joules) of 1.65 moles of photons of this radiation.
April 6, 2011 by Rachel

Chemistry
Find the mass of oxygen gas needed to react with 0.2 moles magnesium and the mass of the product? Working out please
April 12, 2011 by Jannie

Chemistry
How many moles of NaOBr- must be mixed with 0.1788 mole of HOBr and diluted to 1L to prepare a solution having a pH of 8.7043. Ka of HOBr = 2.0 * 10-9
April 16, 2011 by Jude

Chemistry
Find the mass of oxygen gas needed to react with 0.2 moles magnesium and the mass of the product? Working out please
April 16, 2011 by Babiinoob

Orgo
1. Calculate the number of moles of cyclohexanol used in the following reaction: 10.5 mL of cyclohexanol and 9mL of H2SO4 react to form cyclohexene
April 26, 2011 by Nicole

Chemistry
Please help! How many moles of hydrogen are needed to triple the volume occupied by 0.25 mol of hydrogen, assuming no changes in pressure or temperature
May 25, 2011 by Michelle

chemistry
For the reaction Ba(OH)2+2HCLO3 -> Ba(CIO3)2+2H2O calculate the no. of mole of H2O formed .when .01 mole of Ba(OH)2 is treated with 0.0250 moles of HCLO3
July 6, 2011 by solution...

Chemistry
When 0.340 mol of butane, C4H10, are burned with excess oxygen giving CO2 and H2O, how many moles of oxygen are consumed?
September 9, 2011 by Aha

Chemistry
Naoh+h2so4--------h20 +na2so4 Now the question is what number of moles of naoh require to neutralize 1 mole of h2sor.
October 20, 2011 by Anonymous

physics
The temperature of 2.7 moles of an ideal gas is 471 K. How much work does the gas do in expanding isothermally to 3.7 times its initial volume?
December 7, 2011 by Sami

chemistry
A mixture of 8.95 g of Cl2 and 18.0 g of NO2 and an undetermined amount of SO2 occupies a volume of 22.4 liters at 760 mm Hg and 0 C. How many moles of SO2 are present?
March 29, 2012 by marie

Chemistry
For the unbalanced reaction: FeSO4 (s) → Fe 2O3 (s) + SO2 (g) + O2 (g) ; how many total moles of gas are produced from the decomposition of 9.98 mol FeSO4 (s)?
September 24, 2012 by Misha

chemistry
If a 1.59 mole sample of argon occupies 3.07 L at constant temperature and pressure then what volume will 4.35 moles of argon occupy at the same conditions?
April 2, 2013 by sarah

chemistry
How do you calculate deltaHf using the # of moles from a balanced equation? How do you connect the Law of Conservation of Energy to a Thermochemical Equation? Thanks so much!
April 29, 2013 by K

chem
What volume of carbon dioxide gas (at STP) is produced when 1.01 moles of oxygen gas react completely? 2CO + O2 -> 2CO2
November 10, 2013 by Dakota

chem
f the synthesis of 1.00 mol of ATP from adenosine diphosphate (ADP) requires a ΔG of 37.7 kJ, how many moles of ATP are synthesized per mole of O2?
March 9, 2014 by anonymous

chemistry
How many moles of sodium chloride can be produced if 29g of Magnesium Chloride are reacted in the reaction 2NaNO3 + MgCl> 2NaCl+Mg (NO3)2?
March 19, 2014 by green

Chemistry
A student mixed 40ml of 0.2m Na2co3 solution with 50 ml f 0.25M cacl2 solution , what is the except number of moles of naclkkw that I will be formed ?
April 20, 2014 by Mariam

science-chemistry
Calculate the number of moles of solute present in 450. g of an aqueous NaCl solution that is 0.565 % NaCl by weight
June 12, 2014 by joe

chemistry
Air is 78.1% nitrogen, 20.9% oxygen, and 0.934% argon by moles. What is the density of air at 22 °C and 760 torr? Assume ideal behavior.
September 27, 2014 by A

chemistry
How would I calculate the number of moles of AgNO3? I have .0025L but dont I need the Molarity? I have no idea how to find that.
December 6, 2014 by xx

chemistry
How many moles of lead iodide are produced from 300. g of potassium iodide? Usie the reaction below. PB(NO3)+ KI = Ni9OH)2 + NaNO3
January 26, 2015 by Sam

Chemistry
What is the volume of the container needed to store 0.8 moles of argon gas at 5.3 atm and 227°C? (Given: R = 0.08205 l · atm/mol · K)
January 28, 2016 by Abigail

History!!!!
Please Please Please Check my answers!! 1. The leaders of the Virginia Company recruited more settlers and reorganized the colony. They allowed the new settlers to own land. Those settlers began to grow tobacco, a crop they learned about from the Indians. By 1612, Virginians ...
November 7, 2013 by Marie

Physics
Consider a pendulum of length 4.557 m. The acceleration of gravity is 9.832 m/s2 . a) What is its period at the North Pole? Answer in units of s. b) What is its frequency? Answer in units of Hz. c) What is its period in Chicago, where g = 9.803 m/s2? Answer in units of s. d) ...
March 4, 2011 by Ellen

Math
1. Simplify, and write in the base of 3: (9^x . 3^4x)^2 answer: 3^12x 2. Differentiate and simplify a. y= 3x^4 - 4e^x + 8 answer: 4(3x^3 - e^x) b. y= (3 + 4e^x)^5 answer: 20e^x (3+ 4ex)^4 c. y= (e^x - 1) / x^2 answer: (xe^x - 2e^x +2) / x^3
March 24, 2012 by Samantha

Math
1. Simplify, and write in the base of 3: (9^x . 3^4x)^2 answer: 3^12x 2. Differentiate and simplify a. y= 3x^4 - 4e^x + 8 answer: 4(3x^3 - e^x) b. y= (3 + 4e^x)^5 answer: 20e^x (3+ 4ex)^4 c. y= (e^x - 1) / x^2 answer: (xe^x - 2e^x +2) / x^3
March 25, 2012 by Help-please check

Chemistry
1. Molarity is to moles of solute over liters of solution as molality is to A. molar concentration over molal concentration. B. moles of solute over kilograms of solvent. C. molal concentration over molar concentration. D. moles of solute over moles of solvent. 2. In ...
September 23, 2011 by Jack

science
write T if the statement is true or F if it is false. a.)All the planets travel around the sun at the same speed.my answer is T. b.)The sun's gravity keeps the planets in orbit around it. my answer is F. c.)There is an asteroid belt between Jupiter and Saturn.my answer is T. d...
January 9, 2014 by Anonymous

Electrochem
A baby's spoon with an area of 6.25 cm^2 is plated with silver from AgNO3 using a current of 2.00 A for two hours and 25 minutes. a) If the current efficiency is 82.0%, how many grams of silver are plated? b) What is the thickness of the silver plate formed (d= 10.5 g/cm^3)? I...
May 12, 2007 by Keith

chemistry stoichiometry
can someone explain the stoichiometry going on here... so the questions is: A solution containing 0.20g of calcium salt is passed thru a column containing the hydrogen form of a strong acid cation exchange resin. The resulting solution is neutralized with 35 mL of .1 M NaOH. ...
April 2, 2016 by Anonymous

Language Arts
Read each sentence. Circle the contraction or contractions in each sentence below: 1. He's going to show me how to prepare dinner. Answer: Circle He's 2. Can you tell if she's your friend or enemy? Answer: Circle she's 3.We'll have to empty out our garage very soon. Answer: We...
March 2, 2016 by Patrick

Algebra
What is 0.68 written as a simplified fraction? My answer is 17/25. What makes the statement true? 7^-2= My answer is 14. What is 308,745,538 is scientific notation? My answer is 3.1 x 10^8. What is the solution to (3 x 10^2) x (5 x 10^5)written in scientific notation? My ...
October 13, 2015 by Essie

Math
What is 0.68 written as a simplified fraction? My answer is 17/25. What makes the statement true? 7^-2= My answer is 14. What is 308,745,538 is scientific notation? My answer is 3.1 x 10^8. What is the solution to (3 x 10^2) x (5 x 10^5)written in scientific notation? My ...
October 13, 2015 by El

French
Can you check these. I'm not really sure how to do these so I need a little help and examples. Part 1: Des promoms interrogatifs et relatifs Complétez en utilisant qu'est-ce qui ou qu'est-ce que. 1. ---------- se passe? Answer: Qu'est-ce qui 2. ----------- est sur la table? ...
September 19, 2010 by Missy

chemistry
what is the net ionic equation for the following molecular equation. HNO3 is strong electrolyte and CH3COOH is weak electrolyte. NaCH3COO(aq)+HNO3(aq)----->NaNO3(aq)+CHOOH(aq) the same question says use H+ for the hydronium ion, CH3OOH for acetic acid and CH3COO for the ...
March 1, 2014 by Kay

Polarity
Benzyl alcohol is not a good sovent with which to crystallize fluorenol. The melting point looks okay so I'm assuming that polarity is the problem. Benzyl alcohol looks polar to me because it has an OH but it is only partly soluble in water. Couldn't find much on fluorenol. ...
September 26, 2006 by Sheryl

chemistry
Use the following information to identify element A and compound B, then answer questions a and b. An empty glass container has a mass of 658.572 g. It has a mass of 659.452 g after it has been filled with nitrogen gas at a pressure of 790. torr and a temperature of 15°C. When...
December 7, 2006 by Sara

Algebra/Math
Can you check these for me. Directions: Find the slope of the line that passes through each pair of points. 1. (3,-8) and (-5,2) Answer: -10/8 2. (-10,-3) and (7,2) Answer: -5,-17 3. (-7,-6) and (3,-6) Answer: 9 4. (8,2) and (8,-1) Answer: 0 undefined Directions: State whether...
October 17, 2010 by Karen

chemistry
I'm having a problem with the gas constant. This is it: In the question: Calculate the amount of moles of a gas if .455 occupies a volume of 250mL at 27 degrees Celsius and 772mmHg. I do all the correct steps using the R = 8.314 for the 772mmHg. I get .077 for this, which is ...
August 31, 2011 by terrence

Chemistry
The molecular formula of a compound containg only carbon and hydrogen is to be determined. When a sample of the compound is burned on oxygen gas, 7.2 grams of water and 7.2 liters of carbon dioxide gas are produced(measured at STP). When 0.600grams of the compound are ...
January 9, 2011 by Patrick

Chemistry-Dr. Bob
I posted this response under your answer but I thought I would repeat it here just in case you didn't look back at the other one. I really appreciate you helping. When you go to science geek, you have to type in Shockwave/Titration to get the experiment. Now, according to what...
May 12, 2010 by Shelley

(Math)Simplifying using the laws of exponents
I need help with a few problems. 1.) (x^3/4 times y^1/3)^2/3 How is the answer x^1/2y^2/9 2.)(x^-1/3 times y) (x^1/2 times y^-4/3) How is the answer x^1/6 over y^1/3 3.)(4a^2b^-7/2)^1/2 How is the answer 2a over b^3/4 4.) (x^2/3y^-1/3 over 8x^1/2y)^1/3 How is the answer x^1/18...
June 23, 2013 by ameme

Chemistry
I have a reaction here: 2Na3PO4.12H2O + 3BaCl.2H2O --> Ba3(PO4)2 + 6NaCl + 30H2O and a question: 0.349g of BaCl2.2H2O and 0.624g of Na3PO4.12H2O are dissolved in 500mL of water to form a solution - how many grams of the excess reactant remain after teh reaction has gone to ...
September 25, 2007 by Lacey

Social Studies
1. The leaders of the Virginia Company recruited more settlers and reorganized the colony. They allowed the new settlers to own land. Those settlers began to grow tobacco, a crop they learned about from the Indians. By 1612, Virginians were shipping tobacco to England, which ...
October 3, 2014 by Hannah

Intro Chemistry
If a sample of BaSO3 is found to contain 1.73 · 1018 SO32- ions how many moles of Ba2+ ions are present? Express your answer in scientific notation. The following information is given: Molar Mass (g/mol) BaSO3 217.39 Ba2+ ion 137.33 SO32- ion 80.063 Avogadro's No. (mol-1) 6....
March 13, 2010 by echem

Math
What is 0.68 written as a simplified fraction? My answer is 17/25. What makes the statement true? 7^-2= My answer is 14. What is 308,745,538 is scientific notation? My answer is 3.1 x 10^8. What is the solution to (3 x 10^2) x (5 x 10^5)written in scientific notation? My ...
October 13, 2015 by Essie

AP CHEM-URGENT PLEASE
could you please check my work? thanks. For the reaction between reactants A and B below, if 4.925 moles of A is placed into a flask with excess B it is found that the amount of A remaining after 6.85 seconds is 2.737 moles. 2A (g) + B (g)-----> 3 C (g) a. find the rate of ...
February 20, 2008 by Jonathan

Chemistry
A sample of 9.4 grams of NaOH is dissolved into 693 mL of aqueous 0.250 M NaOH (assume no volume change). This solution is then poured into 2.37 gallons of water. (You may assume that the two volumes can be added.) What is the concentration of NaOH in the final solution? ...
October 11, 2010 by May

spanish Sra JmGuin
change verbs to prsent progressive example: (tu) escuchar escuchando 1. (ellas) dar ANSWER: estan dondo 2. (tu) beber ANSWER: estas bebiendo 3. (yo) bailar ANSWER: estoy bailando 4. (el) tomar ASNWER: esta tomando 5. (usted) traer ANSWER: esta treyando 6. (ella) leer ANSWER: ...
November 8, 2007 by sam

Chemistry
If 0.110 mol of liquid H2O and 40.5 g of solid Al2S3 are reacted stoichiometrically according to the balanced equation, how many moles of solid Al(OH)3 are produced?
May 21, 2009 by Julie

Chemistry
Please help me! Thank-you! Calculate the concentration, in moles per liter, of a fertilizer solution if 500.0 mL of the solution contains 1.84 g of copper sulphate, CuSO4.
July 18, 2009 by Sydney

Chem Help
If you are given a 0.27 g piece of sodium metal to react with water, how many moles of HCl would it take to neutralize the sodium hydroxide produced?
November 16, 2009 by Anonymous

AP Chemistry
When finding empirical formula of a compound, why do you have to convert the elements into moles, as opposed to using a mass:mass ratio?
November 16, 2009 by Nicky

chemistry
If you are given a 0.32 g piece of sodium metal to react with water, how many moles of HCl would it take to neutralize the sodium hydroxide produced?
November 17, 2009 by Jim

chem
Suppose that a reaction calls for 1.25 moles of ethanol,C2H6O (mw= 46.07 g/mol d=0.7893g/cm^3. what volume of ethanol shold one measure out
January 31, 2010 by sam

chemical equations
5C(s) + 2SO2(g) > CS2(l) + 4CO(g) How many moles of carbon monoxide form at the same time that 0.246 mol CS2 forms?
February 7, 2010 by Tristan

Chemistry
For the reaction: CH4(g) + 2O2(g)-->CO2(g)+2H2O (l) ÄH = -50.38 kJ/mol, How many moles of methane (CH4) must be burned to produce 137 kJ of heat?
November 7, 2010 by Luke

Chemistry
How many moles of CO2 would be contained in a cylinder the size of a pop can (355 ml) at a temperature of 300K and 10 atm? How much would that weigh?
December 6, 2010 by Grace

Science
3 CaSO4 + 2 AlCl3 Al2(SO4)3 + 3 CaCl2 How many moles of aluminum chloride are required to produce 97.0 g of calcuim chloride in the above reaction?
December 16, 2010 by Catherine

Chemistry
What will be the new pressure when a volume of 21.0 L of a gas at 35.0 degrees celsius and 2.00 atm is compressed to 12.0 L and cooled to 10.0 degrees celcius with no change in the number of moles?
January 12, 2011 by Tori

Chemistry
A nitric acid solution is found to have a pH of 2.70. Determine [H3O+],[OH-], and the number of moles of HNO3 required to make 5.50L of the solution.
April 24, 2011 by Jessica

chemistry
How many moles of sodium bicarbonate are contained in 1mL of a saturated solution of NaHCO3 (approximately 1g of solute is dissolved per 9mL solution)?
October 5, 2011 by Tiffany

chem
calculate the number of moles of glycine(gly)(C2H5NO2) an amino acid found in proteins in a 36.2g sample of glycine. can you show work
March 28, 2012 by lisa

chemistry
the rusting of iron is represented by the eqquation 4Fe + 3O2 --> 2Fe2O3 if you have a 1.25-mol sample of iron, how many moles of Fe2O3 can be made?
June 11, 2012 by britt

College Chemistry
calculate the moles of sulfuric acid that remained in the solution after reaction with the carbonate. the tared mass of carbonate is 1.5179g
September 28, 2012 by Anonymous

College Chemistry
how do i calculate the moles of Na2CO3 present in the original 25.00mL aliquot of carbonate solution?? the tared mass of Na2CO3 is 1.5179g
October 2, 2012 by Anonymous

science
0.042g of Magnesium was reacted with excess HCl at S.T.P. A. Write the equation for the reaction B. How many moles of Mg were used? C. What volume of Hydrogen is produced in this reaction?_
November 28, 2012 by sai

Chemistry
Calculate the number of moles of excess reactant that will be left-over when .350 g if HCN react with .500 g of 02: HCN+O2->N2+CO2+H20
July 20, 2013 by Sara

Chemistry
When 0.016 moles of aluminum sulfate are dissolved in enough water to make 477 milliliters of solution, what is the molarity of sulfate ions?
September 8, 2013 by Anonymous

chemistry
What volume of carbon monoxide gas (at STP) is needed when 1.31 moles of oxygen gas react completely in the following equation? 2 CO + O2 --> 2 CO2
November 10, 2013 by B

chem
How do I calculate the rate of a reaction of a substance using the slope of the lines and stoichiometry of the reactions in moles/sec. I also know that the molarity of that substance.
February 13, 2014 by rachel

Chemistry
What pressure (in atmospheres) will be exerted by 1.3 moles of gas in a 13 litre flask at 22 degrees Celcius? (Gas constant (R) = 0.0821 L atm K^-1 mol^-1)
May 18, 2014 by Anonymous

chemistry
When 3.00 moles of sodium are reacted with large amounts of chlorine gas 145.8 g of sodium chloride are produced determine percentage yield
July 16, 2014 by Veronica

Chemistry
If NaCl has a solubility of 36.0 g in 100 g of H2O at 20 °C, how many moles of water are needed to prepare a saturated solution containing 0.263 mol of NaCl at 20 °C?
December 12, 2014 by Laura

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