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September 28, 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: 67,988

Chemistry
Unknown Acid: #2 Mass of Unknown solid acid transferred:0.414g Volume of volumetric flask: 100.00 mL Concentration of NaOH: 0.0989 M Aliqot of acid titrated with NaOH: 25.00 mL Average volume of Naoh from titration: 13.9 mL Here's where I need help: No of moles NaOH used: ? ...
October 10, 2010 by Rayana

Chemistry
Expt #1- Molecular Weight of Unknown Acid Unknown Acid: #2 Mass of Unknown solid acid transferred:0.414g Volume of volumetric flask: 100.00 mL Concentration of NaOH: 0.0989 M Aliqot of acid titrated with NaOH: 25.00 mL Average volume of Naoh from titration: 13.9 mL Here's ...
October 10, 2010 by Rayana

CHEMISTRY
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 21, 2008 by Jonathan

Chemistry
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 25, 2008 by Kevin

Chemistry (check)
Not sure if these are right 1) What is the Molar Enthalpy of Neutralization (ΔHn) in kJ/mol if 5.00 moles of HCl(aq) (acid) neutralized 5.00 moles of NaOH(aq) (base) and released 13093 J of heat? 13093/5= 2618.6 then convert to kj 2) Calculate the Molar Enthalpy of ...
June 30, 2013 by Mary

Algebra 2
Can someone check my answers. Write the following equations in standard form. 1) x^2 - 2x + y^2 + 4y = 11 answer: (x-1)^2 + (y+2)^2 = 16 2) 4x^2 + 24x - y + 34 = 0 answer: y = 4(x-3)^2 + 2 3) The graph of which equation is a circle? A. 5x^2 + 10x = 9 + 5y^2 B. 5x^2 - 10x = 0...
April 7, 2008 by Troy

MATH
there is a triangle with a base of 2.4 m and both sides are 1.7 m. it is a right triangle. what the heck is the answer? i have an answer sheet and i know the answer is 41 but how do you get that answer?
March 4, 2010 by j

Algebra II
Please check answers: Use the equation of the exponential function whose graph passes through the points (0,-2) and (2,-50) to find the value of y when x= -2. My answer: -2/25 Solve 64^x<32^x+2 Answer: x<10 Write the equation log(243)81=4/5 Answer: 243^4/5 = 81 Evaluate ...
March 29, 2008 by Lucy

Chemistry
Please!!! its extremely urgent. i do not need answers, only how to do it A sample of nitrogen gas (N2) kept in a container of volume 10.1 L and at a temperature of 20.3C exerts a pressure of 3.1 atm. Calculate the number of grams of gas present. Round to one decimal place, do...
October 17, 2011 by Javier

AP Chemistry
Could you please check my work and let me know if my answer is correct? I don't have a solutions guide and I want to make sure I'm really comprehending the material. Calculate the # of grams of barium flouride that will dissolve in 2.50 L of pure water at 25 degrees C. Assume ...
April 8, 2008 by Sig

chemistry
My work: pH = -log(x) = 4.49 x = 3.2359e-5 3.2359e-5 = 5.72/M When I solved for M, I got that large number... 176764.8987 Ka for a given weak acid is 5.72 x 100. What concentration of acid (mM/L) will give a pH of 4.49? I got 176764.8987 M (not converted to uM). Though I am ...
February 28, 2007 by Meche

polynomials
6. Simplify: 4x2yz2 2z Select answer A 2x2y2z2 Select answer B 2x2z Select answer C 2x2yz2 Select answer D 2x2y Select answer E 2x2yz
February 28, 2011 by Bri

chemistry
How many moles of Ag can be produced if 350.g of Cu are reacted with excess AgNO3 according to the equation Cu(s) plus 2AgNO3(aq) plus Cu(NO3)2(aq)?
March 18, 2008 by Whittney

Biochemistry
The concentration of cholesterol in blood from a fasting individual is reported as 185mg %, where mg% is mg/100 mL. Convert this concentration to moles/Liter.
September 1, 2009 by Emma

chemistry
If 150.0 Ml of HCL solution are required to react completely with .35 moles of solid NaOH whats the molarity of the solution?
October 12, 2009 by Aleander Azumah

Chemistry
a 22.5g sample of (NH4)2CO3 (ammonium carbonate) contains_____ moles of ammonium ions. A. o.468 b. 0.288 C. 0.234 d. 2.14 e. 3.47
November 1, 2009 by Peter

chemistry
Determine the number of moles of sulfate ions present in 1.20 mol iron(III) sulfate (Fe2(SO4)3).
January 13, 2010 by q

chemistry
an organic iron compound consisting of Fe, C, H, and O was found to contain 51.043%C, 5.9886%H, 27.17%O, and 15.80%Fe. how many moles of each element are in 100g of the compound
September 14, 2010 by Missy

Chemistry
How do I calculate number of moles of K2C2O4 in 20mL of a saturated (300g K2C2O4.H2O per liter) solution....
September 16, 2010 by Chan

Chemistry
A sample of natural gas at STP is 78% CH4 and 22% C2H6 by volume how many moles of each gas are present in 1.60L of the mixture?
October 7, 2010 by Missy*

chemistry
how many moles of naoh could be absorbed by a so3 hso3 buffer before the case absorbing the capacity of the buffer is destroyed?
November 17, 2010 by joe breckinridge

chemistry
if you react one mole of sodium hyrdoxide with excess copper(II) sulfate, how many moles of copper(II) hydroxid are produced?
February 16, 2011 by valentina

Chemistry Molarity
What is the concentration, in units of molarity, of a 500mL solution containing 0.750 moles of sodium chloride in water?
March 28, 2011 by Toni Jones

Chemistry Molarity
What is the concentration, in units of molarity, of a 500mL solution containing 0.750 moles of sodium chloride in water?
March 28, 2011 by Toni Jones

science
What pressure will be exerted by 10 moles of hydrogen gas in a 7.5 L cylinder at 20C? (Given: R = 8.314 L∙kPa/K∙mol)
July 14, 2011 by jane doe

chemistry
3 moles each H 2 and I 2 are introduced into 1 lit box at temperature of 490'c. find concentration of H 2 in box at equilibrium is established?
October 4, 2011 by Anonymous

chemistry
When gas is burned: CH4 + 2O2 = CO2 + 2H2O, how many moles of water are produced when 6.2 mol of methane are burned?
November 14, 2011 by Lisa

Chemistry
Calculate the partial pressure of helium in a 1.00 L flask that contains equal numbers of moles He, Ne, and Ar at a total pressure of 5.26atm
April 10, 2012 by Randy

chemistry
you dissolve 0.70 moles of HCI in enough water to prepare 250ml of solution. what is the molarity of the solution you have prepared
April 15, 2012 by aileen

chemistry
A cylinder contains 12.0L of air at a total pressure of 44.0psi and a temperature of 35degrees C.How many moles of gas does the cylinder contain?
April 28, 2012 by houston

chemistry
for each of the following unbalanced equations how many moles of thr first product are produced if 0.625mol of the second product forms.
May 3, 2012 by nimo

chemistry
Hassium (III)oxalate contains 2.25 mol of Carbon atoms. What is the number of moles of oxygen atoms in the sample?
October 25, 2012 by Carina

Chemistry
How many moles of glucose , C6H12O6, can be "burned" biologically when 10.0 mol of oxygen is available. C6H12O6(s) + 602(g)---6CO2(g) + 6H2O(l)
December 9, 2012 by Chan

AP Chemistry
0.015 moles of a compound are dissolved in 18 fl. oz. of water. At what temperature will the solution begin to freeze? The density of water is 1.00g/mL
February 10, 2013 by Jana

Honors Chemistry
what volume of solution does a 3.0 molar solution need to have in order to contain 1.8 moles of sodium sulfate?
April 3, 2013 by Erin

chemistry
Calculate the partial pressure of helium in a 1.00 L flask that contains equal numbers of moles of He, Ne, and Ar at a total pressure of 8.35 atm.
May 5, 2013 by Jenny

Chemistry-
If I was trying to find out the number of molecules(N) using moles x avogadro's number, what units would N have?
October 1, 2013 by Nancy

Chemistry
Will the 90-100 mL of distilled water added to the acid solution (10.00 mL) significantly change the moles of H3O+ in the 1.00 M HCl solution? Why or why not?
October 5, 2013 by Ash

Chemistry
50.0mL of 1.04moles HA is added to 50.0mL if 0.90moles NH4OH.With a 1:1 stoichiometric ratio. What is the limiting reactant in moles of this reaction.
October 20, 2013 by Morgan

Physic II
How much work is done by 3 moles of gas when they triple their volume at a constant temperature of 400 K ? show work please
April 17, 2014 by julide

science
Given the following reaction: CaC2 + 2 H2O C2H2 + Ca(OH)2 How many moles of Ca(OH)2 will be produced if 5.800 g of CaC2 are reacted completely?
April 27, 2014 by jay

science
NaOH + HSO -+ Which of the following is the number of moles of NaOH required to neutralize 1 mole of H2SO4 in the equation above?
December 18, 2014 by Jasmine

Physics
A container with a one-liter capacity at 27 degree C is filled with helium to a pressure of 2 atm. how many moles of helium does it hold?
March 9, 2015 by eddy

chemistry
For the following chemical reaction, how many moles of silver iodide (AgI) will be produced from 4 mol of calcium iodide (CaI2)?
April 24, 2015 by chelsea

Chemistry
How do I calculate the molality of a saturated solution of KCl at 70 degrees Celsius? I have gotten the moles of KCl (.66) but am not sure where to go from there.
May 10, 2015 by Mathieu

Chemistry
Write the equation for the dissolution of NH4NO3 in water. If 4.98 mol of NH4NO3 are dissolved, how many total moles of ions are produced?
January 26, 2016 by Hannah

Chemistry
N2 + 3H2 =2NH3 How many molecules of H2 are represented in the reaction? How many nitrogen atoms are represented in the reactants? How many moles of NH3 are formed?
March 24, 2016 by Camilla

physics 1
calculate the net electric charge of 1.25 moles of sodium ions ( a sodium ion consist of 11 protons and 10 eletrons).
April 1, 2016 by Masixole Mnqiwu

Chemistry
If .0162 moles of sodium sulfide is dissolved in 100.0 mL of water, what is the concentration of sodium ions [Na⁺] in solution?
May 2, 2016 by div

chemistry
How many moles of NaOH are there in 1 drop (0.050 mL) of 0.10 M NaOH?
November 4, 2009 by Tamara

college
How many moles of NaOH are there in 1 drop (0.050 mL) of 0.10 M NaOH?
November 4, 2009 by Tamara

Chemistry
if you have 100 mg of CaCl2, how many moles of Cl do you have
February 17, 2010 by David

chemistry
How many moles of NaOH are contained in 100.0 mL of 3.00 M NaOH? /
May 12, 2010 by Carnetta

chemistry
How many moles of water are contained in 160ml of water at 4'c?
July 8, 2010 by Gopal

adult education
How many moles of HCL are in 50.0 mL of 0.600 M HCl?
July 20, 2010 by santhosh

AP Chemistry
what is the number of moles of HCl in 50mL of 1.0M HCl
December 1, 2010 by Sam

chemistry
How many moles of water, H2O, are present in 75.0 g H2O?
December 15, 2010 by t

Chemistry
How many moles of NaOH are present in 30.1 mL of 0.140 M NaOH?
March 13, 2011 by Eric

chemistry
How many atoms of sulfur are present in 32.0 moles of sulfur? why?
April 28, 2011 by Jasmin

chemisry
If you have 32g of NH3 how many moles of NH3 is that?
June 19, 2011 by kelly

Chemistry
how many moles of acid are present in 50 mL of acetic acid?
November 1, 2011 by Anonymous

chemistry
how many moles of NaCl are contained in 1.9L of a 1.7M NaCl solution
March 1, 2012 by nakisha

Chem
1.75 x 10^25 selenium atoms contains how many moles of selenium?
July 8, 2012 by Lu

chemestry 130
6.00 moles H2S*6.02*10^23/1 mole H2S
November 13, 2012 by Anonymous

Chemistry
How many moles of NaCl are in 2.00mL of 1.00M NaCl?
March 21, 2013 by Alice

Chemistry
How many moles of ammonia are in 1.20E25 molecules of ammonia.
October 23, 2014 by Anon

college chem
a. According to the Henderson-Hasselbalch equation, how many grams of sodium acetate will you need to add to 125 mL of 0.100 M acetic acid to make a pH=4.74 buffer? b. What is the actual pH of the resulting buffer when you add that many grams of sodium acetate to 125 mL of 0....
April 7, 2011 by Cat

lab
Number of moles of oxygen gas produced from the complete catalyzed decomposition of 6.80ml sample of a 3.5% solution. Density of the 3.5% solution of H2O2 is 1.01g/ml Let's find out what you know about this and work from there. Show your calculations to the point that you are ...
September 25, 2006 by Melba

Chemistry
If a researcher needs 0.50 L of 3.0 M nitrite buffer at pH 3.00, then she knows that the concentration of nitrous acid (conjugate acid) plus the concentration of nitrite anion (conjugate base) must equal 3.0 M. She must then calculate the amount of each that is necessary to ...
April 11, 2011 by Mike

Chemistry
If the same solute is dissolved in two different solvents to the same concentration and the same temperature, the osmotic pressure ____ My answer & reason: solution A has a smaller molecular weight and therefore, a larger Molarity and higher osmotic pressure (pi=iMRT) ...
February 25, 2009 by Anonymous

chemistry
Can someone please help me with this one? Explain which of the following statements does not make sense: a. a role of masking tape weighs 350 micrograms b. 92 cm cubed of water was poured onto the table c. the room covers an area of 200 m cubed I was thinking it was b because ...
October 21, 2006 by Gloria

math help
Use the following table to answer the questions. (Give your answers correct to two decimal places.) x 1 1 3 3 5 5 7 7 9 9 y 3 2 6 1 3 3 3 2 5 3 (a) Find the equation of the line of best fit. y hat = + x (ii) Graph this equation on a scatter diagram. (Do this on paper. Your ...
June 26, 2013 by Tracy

chemistry
So I did an experiment at school in which we had to form 2.00 grams of precipitate by mixing 2 hydrated compounds. So for the products, obviously one of it is water, and the other 2 products are compounds, one of which, is insoluble. So when I measured the amount of ...
September 15, 2013 by K

Chemistry
how many moles of hydrogen chloride would be needed to react completely with 15g of barium carbonate equation is given: BaCO3 + 2HCl to BaCl2 + H2O + CO2
March 21, 2010 by Johnny

Physics
A diesel engine takes in 0.5 moles of air at 20.0C and at atmospheric pressure. It then compresses it adiabatically to one twentieth of its original volume. which means n = 0.5 T = 20 and Vfinal = V1/20 but where do I go from here? can anyone help?
August 3, 2010 by Physics

chemistry
What volume of nitrogen at 215 degress celcius and 715 mmHg would be required to react with .100 moles of hydrogen to produce ammonia? N2+3H2--> 2NH3
April 16, 2012 by Anonymous

chemistry
What volume of nitrogen at 215 degress celcius and 715 mmHg would be required to react with .100 moles of hydrogen to produce ammonia? N2+3H2--> 2NH3
April 16, 2012 by Anonymous

chemistry
You have 310. mL of a 5.7510-5 M Pb(NO3)2 solution. How many moles of NaCl must be added to precipitate a solid? The Ksp of PbCl2 is 1.610-5. I'm not sure where to go after I make the ICE table
December 2, 2015 by matt

chem please help
when the oxide of arsnic is heated it sublimes and becomes a gas at 650oc and a pressure of 690mmHg the 0.927g sample of the oxide has a volume of 194cm calculate the volume in cm3 that the sample would have at 0oc and 760mmHg(ie at STP)if it were to remain gaseous down to ...
January 30, 2007 by john

More french
Directions: Complete the sentences, choosing the correct possessive adjective. 1. (Mon, Ma, Mes) Tu as ------- livre de maths. Answer: Mon 2. (Notre, Nos) C'est ------- maison. Answer: Notre 3. (Leur, Leurs) Voila -------- enfant. Answer: Leur 4. (Ton, Ta, Tes) Ou est...
January 23, 2009 by Megan

Evaluate Expression
10.Evaluate the following. [9]= answer 9 [-14] Answer = -14 Add: -3+4 My answer 1 -4+(-5) My answer -9 -57+(-38) my answer -95 -53+38 My answer -15
May 6, 2012 by Check Pls

Chemistry
How many grams of calcium carbonate are consumed per 500 g of sulfur (IV) oxide? in what reaction?
May 30, 2007 by LaShanda

Human Biology
I have a value of energy for a meal in kJ. How do I convert this into grams please?
January 10, 2008 by Sarah

chem
delta T = Kf*molality Plug in 5.00 C for delta T, 1.86 for Kf and calculate molality. Then molality x kg solvent x molar mass = grams. You know molality, kg solvent, and molar mass. Calculate grams. molar mass? where did u got the molar mass from ?
February 5, 2008 by Mark

Chemistry
How many grams of KF do you need to weigh in order to prepare 500. mL of solution with a concentration of 0.250 M?
April 29, 2008 by Kiley

Biology 2
What is the number of calories needed to change the temperature of 50.0 grams of water 15.0 Celsius degrees?
October 16, 2008 by Jay

3rd grade
Is a nickel 6 grams or 6 kilograms? A watch 25 g or 25 kg? a dog 22 g or 22 kg? A backpack 4 g or 4 kg? A pencil 6 g or 6 kg? radio 2 g or 2 kg?
February 24, 2009 by bryce

chem
If 60.0 mL of 0.150 M CaCl2 is added to 50.0 mL of 0.100 M AgNO3, what is the mass in grams of AgCl precipitate?
March 2, 2009 by ash

chemistry
The density of a gas is 2.0 grams per liter at STP. Its molar mass is approximately?
March 5, 2009 by Crystal

Physics
A cube of ice weighing 18 grams sublimes into vapor. How many liters of gas will you get?
May 16, 2009 by Kyle

Chemistry
How many grams of CaH2 are needed to generate 54.5L of gas if the pressure of is 815 torr at 20C?
October 4, 2009 by Monica

science
1. How many molecules of ammonia, NH3, are produced from 12.5 grams of hydrogen in the following balanced equation?
November 9, 2009 by shamisha

Physics
what is the mass of hydrogen peroixide, H2O2, in 350 grams ofa 20% by weight solution?
December 4, 2009 by Doly V

chemistry
how ,many grams of aspirin are required to react exactly with 29.40ml of a 0.6M solution of sodium hydroxide
January 17, 2010 by ujay

Stoichiometry
if you have 66.6g NH3, how many grams of F2 are required for a complete reaction? please show work!!!!!
February 7, 2010 by Tristan

chemistry
If 2500 ml container is filled with 175 grams of argon at -48 degrees celsius, what is the pressure?
February 16, 2010 by Bob

chemistry
How many joules of heat would be required to completely melt 5.00 grams of H2O (s) at 0C to H20 (l) at 0C
April 2, 2010 by Jayla

Physical Science
if an object has a mass of 615 grams and a volume of 105cm3 is the density 5.86 g/cm3?
April 14, 2010 by cassie

chemistry
How much water at 25 degrees celsius is needed to dissolve 10 grams of baruim phosphate?
April 22, 2010 by guest

chem
Use this percentage to calculate the mass of fluorine in grams contained in 29.0 g of copper (II) fluoride
April 25, 2010 by melissa

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