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September 20, 2014

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: 10,888

CHEMISTRY
The specific heat capacity (cp) of lead is 0.13 J/g C. How much heat (in J) is required to raise the temperature of 15 grams of lead from 22 C to 37 C? a. 2.0 b. -0.13 c. 0.13 d. 29
May 9, 2010 by GRACE

CHEMISTRY
The specific heat capacity (cp) of lead is 0.13 J/g C. How much heat (in J) is required to raise the temperature of 15 grams of lead from 22 C to 37 C? a. 2.0 b. -0.13 c. 0.13 d. 29
May 9, 2010 by GRACE

college
Primitive air consists of 58% H2O 32% CO2 10% N2 so how many grams of primitive air do you need to react with 1 gram of H2?
July 6, 2010 by John

chemistry
a student dissolves 5 grams of table salt into 600 mL of water. in this situation, water is the _, and salt is the _
October 29, 2010 by Anonymous

science
If you have 0.50M Ca(NO3)2 solution, how many mL of this solution must be evaporated to obtain 32.8 grams of solid Ca(NO3)2?
November 3, 2010 by Makena

chemistry
How many grams of NH3 form when 27.5L of H2 (measured at STP)react with N2 to form NH3 according to: N2(g) + 3H2 (g) = 2NH3 (g)
November 22, 2010 by Susan

Anatomy and Physiology
calculate the percent KBr in a solution containing 0.88 grams KBr per 800 mL solution.
March 7, 2011 by paul durlin

algebra 2
10 cm^3 of normal specimen of human blood contain 1.2g of hemoglobin. How many grams does 40cm^3 of same blood contain? Thank you.
March 15, 2011 by Esther

Chemistry
how many grams of each species will be present at the end when 0.500g of copper is added to 2.500g of AgNO3? Cu(s) + 2 AgNO3(aq) --> 2 Ag(s) + Cu(NO3)2 (aq)
June 8, 2011 by tc

Science
find the density of the two rocks. The jagged rock has a mass of 56 grams. this rock therefore has a density of ?
September 22, 2011 by Anonymous

chem
a piece of (density= 10.5 g/ml)dropped into water displaces 21.56 ml of water. what is the mass (in grams) of this piece of silver?
September 27, 2011 by jj

Chemistry
MgCl2(aq) + 2 NaOH(aq) --> Mg(OH)2(s) + 2 NaCl(aq) How many grams of Mg(OH)2 would form if 50.00 mL of 0.9750M NaOH were combined with 50.00 mL of 0.8820 M MgCl2?
November 26, 2011 by Lauren

Chemistry
MgCl2(aq) + 2 NaOH(aq) --> Mg(OH)2(s) + 2 NaCl(aq) How many grams of Mg(OH)2 would form if 50.00 mL of 0.9750M NaOH were combined with 50.00 mL of 0.8820 M MgCl2?
November 26, 2011 by Lauren

math
A Banana Has 27 Grams Of Carbohydrates. It Has A Total Of 121 Calories. How Many Of Its Calories Come From Sources Other Than Carbohydrates?
November 30, 2011 by Hong

chem
A pressure cooker with a volume of 6 L is filled with 27 grams of water and heated to 390.2 K. What is the pressure (atm) in the cooker?
December 5, 2011 by laura

chem
A pressure cooker with a volume of 6 L is filled with 27 grams of water and heated to 390.2 K. What is the pressure (atm) in the cooker?
December 5, 2011 by laura

chemistry
A pressure cooker with a volume of 6 L is filled with 27 grams of water and heated to 390.2 K. What is the pressure (atm) in the cooker?
December 6, 2011 by laura

chemistry
How much heat is needed to raise the temperature of 75 grams of copper from 35aC to 57aC? The specific heat of copper is 0.385 J/g aC.
December 7, 2011 by mario

chemistry
How much heat is needed to raise the temperature of 75 grams of copper from 35aC to 57aC? The specific heat of copper is 0.385 J/g aC.
December 7, 2011 by mario

CHEMISTRY
How many grams of dry need to be added to 1.90 of a 0.800 solution of ammonia, , to prepare a buffer solution that has a of 9.00? Kb for ammonia is 1.8*10^-5.
March 11, 2012 by Abinaya

Chemistry
Calculate the amount of energy required to change 32.8 grams of BF3 from -32 degrees celsius to 56 degrees celsius.
April 3, 2012 by Faith

Chemistry
2 Fe (s) + 6 HCl (aq) -> 2 FeCL3 (s) + 3 H2 (g) Given 16 g of HCl and 10g Fe react with how many grams of FeCl3 are produced (limiting reactant)?
May 24, 2012 by Lily

chemistry
the reaction of N2+3H2-->2NH3 is used to produce ammonia commercially. if 1.40 g of N2 are used in the reaction, how many grams of H2 will be needed?
May 28, 2012 by sam

Chemistry
a solution is 0.0300 m in Sodium. How many grams of sodium carbonate are necessary to prepare 900.0 ml of this solution? I don't know where to start on this.
September 28, 2012 by Alex

chemistry
if the heat of combustion of glucose is -2808 kJ/mol, how many grams of glucose are required to supply 1650 kJ of heat?
November 12, 2012 by Anonymous

Chemistry
If the sign contains neon at a pressure of 1.72 torr at 32 C, how many grams of neon are in the sign? (The volume of a cylinder is pie r2 h.)
December 1, 2012 by Sam

chemistry
How many grams of NaOH would be needed to react with 199 g of HCl? NaOH + HCl --> NaCl + H2O
July 15, 2013 by ren

Chemistry
What volume of a liquid having a density of 4.55 g/cm3 is needed to supply 10.47 grams of that liquid? Answer in cm3.
October 12, 2013 by Andy

Chemistry
What is the % ( m/ v) concentration of the calcium chloride solution 1000.00 grams which was dissolved in water to make 1000.00 mL of the solution
December 4, 2013 by Ruffles

chemistry
how many grams of CH4 (methane) must be burned to form 82.6g of H2O? equation: CH4+O2----> CO2+H2O
January 16, 2014 by frances

chemistry
how many grams of CH4 (methane) must be burned to form 82.6g of H2O? equation: CH4+O2----> CO2+H2O
January 16, 2014 by jocelyn

Chemistry
How many grams of a 17.7% potassium sulfate solution would contain 419.9 g potassium sulfate? Answer in units of g
March 13, 2014 by Kristen

Chemistry
How many grams of HCl are needed in order to make 0.500 liters of a 0.100 M HCl solution? 1.82 g 18.2 g 0.500 g
June 6, 2014 by Anonymous

Chemistry
The concentration of glucose in blood is 5.67%m/v. How many grams of glucose would be found in an adult male with a blood volume of 5.2L?
July 13, 2014 by Diana

chem
Mass of tablet: 1.4930g Volume of HCL added: 100ml Find the milimoles of HCL added I have many questions similar to this, could someone explain how to do this...do I just find the # of moles regularly and multiply by 1000? any help would be much appreciated
October 16, 2007 by Alexa

CHEMISTRY
a) why should you use moles in stoichimetric problems? b) solid reacts violently with water, producing heat, hydrogen gas, and sodium hydroxide. how many molecules of hydrogen gas are formed when 48.7 g of soodium are added to water? 2Na + 2H2P ------> 2NaOH + H2
April 20, 2008 by john

chem
a) why should you use moles in stoichimetric problems? b) solid reacts violently with water, producing heat, hydrogen gas, and sodium hydroxide. how many molecules of hydrogen gas are formed when 48.7 g of soodium are added to water? 2Na + 2H2P ------> 2NaOH + H2
April 20, 2008 by john

physics
A diesel engine takes in 0.5 moles of air at 20.0aC and at atmospheric pressure. It then compresses it adiabatically to one twentieth of its original volume. Obtain the final temperature, pressure and volume of the compressed air? which formula should i use for this equation ...
July 30, 2010 by John

college
If 0.0900 g of a metal, M, reacts with excess hydrochloric acid to form 5.00*10(exp.)-3 moles of hydrogen gas and a solution of MCl(subscript)3. Calculate the molar mass of metal, M and identify it. The unbalanced equation is: M(s)+ HCl(aq) =>MCl(sub.)3 + H(sub)2.
November 30, 2010 by Alex

Chemistry
How many moles of Sulfur are in 1 mole of Al2(SO4)3 and If the densitry of a noble gas is 1.783 g/L at STP, that gas is.... My guess: Argon? Then theres a question that says "Which as the greater mole.... and it lists things like: 1 mole Of Ar 1 Mole of O How would you figure ...
February 15, 2013 by Bryce

chemistry
using the following salts listed below, calculate the moles of acid and conjugate base needed to make 100 ml of 0.50 M, ph 6.5,6.7, and 6.8 phosphate buffer solution. (For H2PO4-, pka=6.64) Salt Molar mass, g/mol KH2PO4 136.09 NaH2PO4*H2O 137.99 Na2HPO4*7H2O 268.09 K2HPO4 174.2
October 28, 2012 by alleyx3

Chemistry #25
Use enthalpy of formation data to calculate the number of moles of CO2(g) produced per megajoule of heat released from the combustion of each fuel under standard conditions (1atm and 25 degrees C) a. coal C(s, graphite) = _____mole-MJ b. natural gas, CH4(g)= c. propane, C3H8(g...
October 28, 2013 by Chelsea

college chem
A researcher explores the ideal gas equation. He measures the pressure of a system at different temperatures ( keeping the volume and moles of the gas constant) and creates a plot of P versus T. What is the slope of the line that results if the volume is 1.0L when 1.0 mol of ...
February 1, 2013 by k

chemistry
You took 0.99ml of a hexokinase assay solution and added 10 ul of an unknown glucose sample. The absorbance at 340nm is 0.422 the extinction coefficient is 6.22x10^3 the molecular mass of glucose is 180.16g/mol. What is the concentration of glucose in the original sample... In...
September 30, 2013 by lacy

chemistry
You took 0.99ml of a hexokinase assay solution and added 10 ul of an unknown glucose sample. The absorbance at 340nm is 0.422 the extinction coefficient is 6.22x10^3 the molecular mass of glucose is 180.16g/mol. What is the concentration of glucose in the original sample... In...
September 30, 2013 by lacy

American History
1. Which of the following explains why the study of slavery is difficult for historians? a. Slaves left few firsthand accounts because they were forbidden to read and write. b. Most slaves could read, but the majority of slaves could not write. c. Actually, the study of ...
January 28, 2008 by CM

CHEM
I am still not quite grasping how to complete this problem: Posted by K on Sunday, October 14, 2007 at 6:43pm. Many home barbeques are fueled with propane gas C3H8. What mass of carbon dioxide (in kg) is produced upon the complete combustion of 18.9L of propane (approximate ...
October 15, 2007 by K

Chemistry
100.0 mL Vinegar (d=1.06g/mL) contains 4% acetic acid. a. How many moles of acid are in 100 mL of vinegar? b. How many mL of 0.11 M NaOH are required to neutralize the vinegar?
May 30, 2012 by Nina

Chemistry
A sample of sucrose, C12H22O11(s),contains 0.16 mol of oxygen, atoms(O). a.) What amount in moles of sucrose is in the sample? b.)How many atoms of carbon are in the sample?
April 8, 2013 by Lg

chemistry
what is the maximum amoutn of KCL that can dissolve in 200 gram of water? ( solubility of KCL is 34 grams/100 gram H2O at 20 celsius
June 10, 2008 by Miley

CHEM
How many grams of water and iron must react to produce 543 g of iron oxide, Fe3O4? 3Fe + 4H2O---> Fe3O4 + 4H2
August 3, 2009 by Christian

Chemistry
The following reaction represents the decomposition for water: 2H2O - 2H + O How many molecules of hydrogen are produced from the decomposition of 12.2 grams of water into its elements?
March 25, 2010 by Stacey

nutrient
you determine that 1 ounce of the peanut butter container contains 115 calories and 9 grams of fat. What percent of the calories come from fat?
April 15, 2010 by Nika

Chemistry
When heated, lithium reacts with nitrogen to form lithium nitride: 6Li+N2 --> 2Li3N What is the theoretical yield of Li3N in grams when 12.4 g of Li is heated with 33.9g of N2
June 12, 2010 by Jerry

Chemistry
The water vapor pressure at 25 degrees celsius is 23.76 torr. If 1.25 grams of water is enclosed in a 1.5 L container, will any liquid be present? If so, what mass of liquid?
September 28, 2010 by Kay Pham

IPC
The latent heat of vaporization of water is 540 calories/gram. How many calories are required to completely vaporize 500 grams of water?
October 12, 2010 by Katy

chemistry
How many grams of potassium formate, KHCOO, must be added to 500 mL of a .07 M solution of HCOOH to produce a buffer solution with a pH of 3.50? given: Ka of HCOOH=1.8 x 10^-4
November 13, 2010 by Audrey

CHEM
a cyinder with a volume of 5.37 liters contains N2 at a pressure of 2.82 atm at 26 celcius. how many grams Ne must be added to raise the total pressure to 7.5 atm
November 20, 2010 by MAX

Chemistry
Given the following reaction: HCl(g) + SrO(s) SrCl2(s) + H2O Calculate the mass of HCl in grams that would react with 11.44 kg SrO.
November 25, 2010 by andrea

Chemistry
How much heat in kJ is required to melt 54 grams of ice at 0 degrees C into water at 0 degrees C if delta Hvap for water = 6.01 kJ/mol?
December 14, 2010 by Hannah

Chemistry
Given the following two step reaction: 4 P + 5 O2 -> P4O10 P4O10 + 6 H2O -> 4H3PO4 If you have 8.28 g of P, 15.65 g of O2, and 19.95 g of H2O, how many grams of H3PO4 can be produced?
June 30, 2011 by Bradley

Chemistry
You have 250 mL of a 0.80 M solution of silver nitrate AgNO3 (169.87 g/mol) dissolved in water. How many grams of AgNO3 does the solution contain?
October 17, 2011 by sara

chemistry
How many grams of NH4Cl must be added to 0.490 L of 1.70 M NH3 solution to yield a buffer solution with a pH of 9.40? Assume no volume change. Kb for NH3 = 1.8 10-5.
October 26, 2011 by kelly

chemistry
. How many grams of H2SO4 (98.1 gmol-1) are required to react with 4.0 g NaOH (40.0 gmol-1) in this neutralization reaction?H2SO4 + 2NaOH  Na2SO4 + 2H2O a. 2.4 g b. 4.9 g c. 9.8 g d. 20 g
December 11, 2011 by anonymous

chemistry
how many grams of potassinum nitrate are produced from 81.6kg of potassinum chloride and 40.8 kg of hydrogen nitrate? 4KCl+4HNO3+O2------- 4KNO3+2Cl2+2H2O
February 26, 2012 by rk

Chemistry
A solution contains 0.55 g of dissolved Sn 4+ ions. How many grams of Na2CO3 must be added to the solution to completely precipitate all of the dissolved Sn4+?
April 23, 2012 by Anna

Chemistry
A solution contains 1.50 g of dissolved Pb 2+ ions. How many grams of NaI must be added to the solution to completely precipitate all of the dissolved Pb 2+ as PbI2?
April 24, 2012 by annabel

chemistry
How many grams of hydrogen can be prepared by treating 2.63 g of iron with 130.0 mL of 1.50 M sulfuric acid solution, to give iron(III) sulfate and hydrogen?
September 30, 2012 by sarah

A.P. Environmental Sciences
.5 grams of pure copper sulfate powder and 2L of water were used to create a copper sulfate solution with a concentration .5ppm. How was this done?
October 10, 2012 by Michelle

chemistry
CaO + C --> CaC2 + CO2 [unbalanced] If 244 g of CaO is combined with 318 g C, how many grams of CO2 could be produced if the reaction goes to completion?
November 5, 2012 by Sheree'

Chemistry
2AgNO3 + BaCl2 --> 2AgCl + Ba(NO3)2 How many grams of sliver chloride are produced from 5.0g of sliver nitrate reacting with an excess of barium chloride?
March 13, 2013 by Christie

science
The latent heat of vaporization of water is 540 calories/gram. How many calories are required to completely vaporize 500 grams of water?
June 5, 2013 by Quan

Chemistry II
An analgesic mixture is 37.5% aspirin by mass. How many grams of the mixture are needed to provide 325 mg aspirin. Make sure to show your work.
August 26, 2013 by Krista

Chemistry
When 4.76 g of a solid mixture composed of NH4Cl and CaCl2 was dissolved in 100.0 mL of water, the temperature of the water rose by 4.73C. How many grams of each substance was in the mixture?
June 26, 2014 by Luke

nutrition
How many grams of fat would you have to eat if you want your diet to be one in which 30% of your calories come from fat, and your caloric intake is 2000 calories?
September 12, 2014 by TayB

Chemistry
How many significant figures in total do you have to use when using the electronic balance that has accuracy up to three figures after the decimal point that you used in the lab, to weigh a sample that is less than 10 grams.
September 9, 2007 by Heather

chemistry
Gaseous arsine reacts according to the balanced equation. If a total of -3663 KJ of heat is produced in the reaction as written, how many grams of AsH3 are consumed? (Enthalpy= -1867.2) 2 AsH3(g) + 3 O2(g) --> As2O3(s) + 3 H2O(l)
February 27, 2008 by Anonymous

chemistry
If 6.4 grams of KOH crystals are palced within 1.5 L of water(distilled), and after 2 days several crystals are still visible, what is the condition of the system?Is it saturated,closed,unsaturated,open or supersaturated? Thank you
April 4, 2008 by Jenny Q

chemistry
Gaseous carbon monoxide reacts according to the balanced equation. If a total of 1040 kJ of heat is generated in the reaction as written, how many grams of CO2 are produced? enthalpy=-566kJ 2 CO(g) + O2(g) → 2 CO2(g)
February 25, 2010 by eng

chemistry
If 11.53g hydrogen sulfide reacts with 3.97g oxygen gas in the following reaction: 2H2S + O2 + H2O which is the maximum mass of sulfur that can be produced? which is the limiting reactant ? which reactant is in excess ? by how many grams?
May 23, 2010 by Charile

chemistry
How many grams of FeCl2 should be dissolved in 1 kg of water to make its boiling point equal to 101.56 degrees centrigrade at atmospheric pressure of 1 atm? (Kb=0.52 degrees Celsius/m; solute is completely dissociated). Thanks!! =)
July 18, 2010 by el

physics
A ball of mass 200 grams is whirled in a circle at the end of a strong 100 cm long rope whose breaking strength is 10 N. Neglecting gravity, the maximum speed of the ball is approximately.
September 11, 2010 by Brittany

Chemistry- Buffers
a buffer is prepared by mixing .208 L of 0.452 M HCl and 0.5 L of 0.4 M sodium acetate. When the Ka= 1.8 x 10^-5 I figured out that the pH= 4.74 but then it asks how many grams of KOH must be added to the buffer to change the pH by .155 units?
December 5, 2010 by Mikey

Chemistry
Consider the following chemical equation. MnCl2(s) + H2SO4(aq) → MnSO4(aq) + 2 HCl(g) How many grams of manganese(II) chloride must react with sulfuric acid to release 50.0 mL of hydrogen chloride at STP?
December 5, 2010 by Kalen

chem
How many grams of magnesium oxide are formed when 13.5 L of oxygen gas, measured at STP, completely reacts with magnesium metal according to the following reaction? i got .496 g but i know that like way off
February 17, 2011 by hannah

Chemistry
What would be the resulting molarity of a solution made by dissolving 21.9 grams of KCl in enough water to make an 869-milliliter solution? Show all of the work needed to solve this problem.
March 21, 2011 by ilyrae

physics
You have an inclined plane. It is 2m long and 1m high. A cylinder of mass 300 grams and 3cm radius is initially at rest at the top of the hill. What is its angular velocity when it reaches the bottom of the hill?
April 6, 2011 by Lakeshia

Chemistry
How many grams of KNO3 are needed to make 450 mL of a solution that is to contain 5.50 mg/mL of potassium ion? Calculate the molarity of the solution. ______g ______M i honestly don't know where to start, but i know that M=mol/L will be involved somewhere... Please help...
May 10, 2011 by Sam

Chemistry
In this balanced equation 4Al + 3O2 = 2Al2O3. When 0.54 mole aluminum is reacted in a closed container with 7.80 g oxygen, how many grams of aluminum oxide can form. Please show steps to work out. Thanks
July 16, 2011 by Pamela

AP CHEMISTRY
Calculate the solubility of LaF3 in grams per liter in the following solutions. (Ksp = 2. 10-19.) a) pure water Ans: .00182g/L b) 0.037 M KF solution c) 0.055 M LaCl3 solution NEED b&c PLEASE HELP
March 13, 2012 by HELP PLEASE

penketh high
Laughing Gas, N2O, is made by the careful decomposition of ammonium nitrate NH4NO3 (s) = N20 (g) + 2H20 (g) How many grams of N2O can you obtain? How many dm3 of stream would also be produced?
November 18, 2012 by christy

Chemistry
When a sample of NH3(g) (296.5 grams) is placed in 140.0 L reaction vessel at 676.0 C and allowed to come to equilibrium the mixture contains 6.250 mol of N2(g). What is the concentration (mol/L) of H2(g)? 2NH3(g) = N2(g)+3H2(g)
October 4, 2013 by plzprovidetheanswer

Chemistry
excess magnesium is reacted with 45 grams of sulfuric acid. 9.5 liters of hydrogen gas are collected understand conditions of temperature and pressure. what is the percentage of hydrogen sulfate and of water in the acod solution?
March 28, 2014 by Anonymous

physics
Calculate the magnitude of the force if a ball of mass 249.9 grams, and initial velocity +16.5 m/s is struck back on the same path with a final velocity of -22.0 m/s. Assume the contact time is 3.1 milliseconds. Use 2 s.f.
June 9, 2014 by allen

AP Chemistry--gas law questions
Hey, My AP Chem class did a lab for determing the molar mass of a volatile liquid by vapor density. There are a few calculations that I can't seem to get: 1.) The moles of air displaced by the volatile liquid vapor (at RT) 2.) The molar mass of air (calculated) 3.) Mass of air...
November 25, 2006 by Warren

chemistry
How many grams of copper is deposited from an aqueous solution of copper sulfate, (CuSO4(aq)), by passing one mole of electrons into a copper plating cell? A. 254g B. 127g D. 42.3g E. 31.8g
May 24, 2008 by Mable

chemistry
How many grams of copper is deposited from an aqueous solution of copper sulfate, (CuSO4(aq)), by passing one mole of electrons into a copper plating cell? A. 254 g B. 127 g C. 63.5 g D. 42.3 g E. 31.8 g
May 24, 2008 by Rapinder S.

Physics
Here, I am dealing with a Science formula for momentum. The formula is: M= mv So, I have: m= 10 grams (.01 Kilograms) v= 5,000 centimeters a second (50 m/s) It says to Find M and also solve the formula for M. Please help!
June 8, 2010 by Amal

Physics
Here, I am dealing with a Science formula for momentum. The formula is: M= mv So, I have: m= 10 grams (.01 Kilograms) v= 5,000 centimeters a second (50 m/s) It says to Find M and also solve the formula for M. Please help!
June 8, 2010 by Amal

Chemistry
Determine how many grams of active antacid ingredient AL(OH)3 would be necessary to neutralize the HCL in 50.0 mL of .0100 M HCL (an approximation of the conc. of HCL in the stomach) 3HCL9aq)+AL(OH)3(s)-> AlCL3 (aq) = 3H2O (L)
June 7, 2011 by Vinny

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