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December 19, 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: 11,391

Chemistry
The equation below shows the incomplete combustion of ethene. C2H4(g) + 2O2(g) ==> 2CO(g) + 2H2O(g) If 2.70 mol C2H4 is reacted with 6.30 mol O2, a) identify the limiting reagent. b) calculate the moles of water produced. Show all steps.
March 28, 2010 by Keith

Chemistry
4.00 mol of solid A was placed in a sealed 1.00-L container and allowed to decompose into gaseous B and C. The concentration of B steadily increased until it reached 1.20 M, where it remained constant. A(s) <-------> B(g)+C(g) Then, the container volume was doubled and ...
February 5, 2013 by Anon

Chemistry
A tank contains exactly 10^(6)liters of pure water. 1.0*10^(-6) moles of HCl (g) is bubbled into this tank. What is the resulting pH? The answer is 7, but I was only able to deduce that based on the fact that water has a neutral pH, but there's a mathematical way to do it and ...
March 22, 2013 by Jonah

chemistry
for the reaction: 4NH3+5O2=4NO+6H2O; 15.0g of NH3 and 27.5g of O2 were reacted. a). which is the limiting reactant? b).how many moles of NO are formed from the limiting reactant in the above reaction. what would be the first step in this problem?
March 5, 2008 by tina

Chemistry
Why do we need to use amount in moles to solve stoichiometry problems? Why can't I just convert from mass to mass? I'm not sure how to answer. I think I know the answer and just can't formulate it into words.
March 4, 2010 by Ana

Chemistry
You have acid reflux and you take teaspoon of sodium bicarbonate. Assuming that one gram of sodium bicarbonate made it down into your stomach, how many moles of acid could it neutralize?
March 15, 2010 by Anonymous

Attn: DrBob
A household bleach solution contains 5.25% (by mass) NaClO. How many moles of NaClO are needed to make 1000 L of the solution? (density = 1.07g/mL) This is the complete question on my assignment. It's 1000 L.
March 26, 2010 by Staci

college chemistry
2h2o2(aq) ---> 2h2o(l) + o2(g) if someone puts 0.470 ml of hydrogen peroxide on a cut how many moles of hydrogen peroxide are used? Assume the density of the solution is equal to the density of water.
January 30, 2011 by Help please

Chemistry
if antiseptic hydrogen peroxide is 3% H2O2 by mass, approximately how many moles of H2O2 are present in each gram of antiseptic solution? you can assume the solution has the same density as water. show your calculations.
December 2, 2011 by Ivy

Chemistry
A "neon" sign contains 2.410^2mL of argon. Assuming that the gas is at standard temperature and pressure, there is 1.00 moles of gas per 22.4 L of volume. How many argon atoms are present in this sign?
June 5, 2013 by Anonymous

chemistry
3 moles of an ideal gas initially at a pressure of 1 atm and a temprature of 100C are expanded to twice the initial volume and then heated to 200C at the new volume.What is the final pressure in atm?
May 2, 2014 by md shahnawaz

Chemistry
The titration reaction of a solution containing 1.00 g mixture of Na2CO3 and K2CO3 with HCl shows that there are 8.50x10^-3 moles of C03-2. Find the weight percent of Na2CO3 and K2CO3 in the mixture. Please Help!!
December 7, 2014 by Magaly

Chemistry
The mass of a single barium atom is 2.28E-22 grams. How many barium atoms would there be in 37.4 milligrams of barium
May 25, 2009 by Claudia

math
the density of a diamond is 3.52 grams per cubic centimeter. Sally has a diamond that has a volume of 20 mm^3. What is the weight of the diamond?.
April 6, 2011 by Dan

math
Each liter of air has a mass of 1.80 grams.How many liters of air are contained in 2.5 x10 to the third power kg of air?
July 3, 2011 by Anonymous

math
Each liter of air has a mass of 1.80 grams.How many liters of air are contained in 2.5 x10 to the third power kg of air?
July 3, 2011 by Anonymous

math
Each liter of air has a mass of 1.80 grams.How many liters of air are contained in 2.5 x10 to the third power kg of air?
July 3, 2011 by Anonymous

math
Each liter of air has a mass of 1.80 grams.How many liters of air are contained in 2.5 x10 to the third power kg of air?
July 3, 2011 by Anonymous

math
Each liter of air has a mass of 1.80 grams.How many liters of air are contained in 2.5 x10 to the third power kg of air?
July 3, 2011 by Anonymous

chemistry
A sample of H2 with a volume of 35.0 L at STP is reacted with excess O2 to produce H2O. How many grams of H2O are produced? 2 H2 (g) + O2 (g) --> 2 H2O (g)
November 14, 2011 by Anonymous

Algebra--Help needed!
Does anyone at least slightly understand direct and inverse variation? I get the basic idea, but I'm still a little confused, especially with inverse variation. What I'm having more trouble with is conversion using direct and inverse variation. Today, my teacher kept talking ...
November 4, 2008 by Celina

chemistry
How many grams of PbCO3 will dissolve when exactly 5.0 L of 1.25 M H is added to 6.0 g of PbCO3? When the equation is PbCO3(s) + 2H(+)(aq) = Pb(2+)(aq) + H2O(l) + CO2(g)
October 3, 2011 by Anonymous

chemistry
Calculate the molar solubility of FeCO3 . How many grams of FeCO3 are present in 15.0 L of a saturated FeCO3 solution?
May 10, 2012 by qana

chemistry
calculate the molar solubility of FeCO3. How many grams of FeCO3 are present in 15 L of a saturated FeCO3 solution ?
May 13, 2012 by Anonymous

Chemistry
How many grams of I2 are present in a solution if 38.55ml of 0.160M Na2S2O3 solution is needed to titrate I2 the solution?
November 19, 2012 by Michi

Chemistry
How many grams of I2 are present in a solution if 39.85mL of 0.160M Na2S2O3 solution is needed to titrate the I2 Solution
March 14, 2014 by Jackie

chem
Methyl alcohol can be used as a fuel instead of, or combined with, gasoline. A sample of methyl alcohol, CH3OH, in a flask at constant volume exerts a pressure of 254 mm Hg at 57 degrees C. The flask is slowly cooled. a) assuming no condensation, use the ideal gas law to ...
March 16, 2007 by Chris

Chemistry
The mass of a single silver atom is 1.79E-22 grams. How many silver atoms would there be in 143 milligrams of silver?
September 9, 2007 by Kellie

chemistry
Find the mass in grams. a. 4.30 x 10^16 atoms He, 4.00 g/mol b. 5.710 x 10^23 molecules CH4, 16.05 g/mol c. 3.012 x 10^24 ions Ca^2+, 40.08 g/mol
March 16, 2009 by jaz

chemistry
How many grams of steam at 100 Celsius would be required to raise the temp. of 35.8 g solid benzene, from 5.5 Celsius to 45.0 Celsius???
February 24, 2010 by pgarcia

Chemistry
How many grams of PbCO3 will dissolve in 1.00L of 1.00M H+ is added to 5.00g of PbCO3?? PbCO3(s) + 2H+ (aq) -> Pb2+ (aq) + H2O (l) + CO2 (g)
July 18, 2011 by San

chemistry
The mass of a single silver atom is 1.79E-22 grams. How many silver atoms would there be in 112 milligrams of silver?
September 25, 2011 by savannah

chemistry
I need to find out Molar solubility of CuS. How many grams of CuS are present in 15.0 L of a saturated CuS solution,
November 14, 2011 by Ashley

Chemisty
The mass of a single silver atom is 1.79E-22 grams. How many silver atoms would there be in 153 milligrams of silver?
January 17, 2012 by love

Chemisty
The mass of a single niobium atom is 1.54E-22 grams. How many niobium atoms would there be in 312 milligrams of niobium?
January 18, 2012 by love

chemistry
The mass of a single uranium atom is 4.70E-22 grams. How many uranium atoms would there be in 339 milligrams of uranium?
February 19, 2012 by pa

Chemistry
The mass of a single uranium atom is 4.70E-22 grams. How many uranium atoms would there be in 167 milligrams of uranium?
October 6, 2012 by Miranda

Chemistry
The mass of a single barium atom is 2.28E-22 grams. How many barium atoms would there be in 182 milligrams of barium?
January 23, 2013 by Kim

Chem
The mass of a single uranium atom is 4.70E-22 grams. How many uranium atoms would there be in 164 milligrams of uranium?
March 16, 2013 by Tez

CHEMISTRY
When 10.8 g of Silver was reacted with Sulfur, 12.4 grams of product was produced (there was only one product). What is the empirical formula of the product?
October 30, 2014 by X

Chemistry: molality and freezing point?
What mass of ethylene glycol C2H6O2, the main component of antifreeze, must be added to 10.0 L water to produce a solution for use in a car's radiator that freezes at -23.3C? Assume the density for water is exactly 1g/mL. m = moles solute / kg solvent Help please?
January 27, 2009 by Agatha

chemistry
The typical battery used in a standard flashlight produced approximately 1.5 V. If the value for ΔG of the reaction were −289,500 J, what would you calculate as the moles of electrons exchanged in the balanced redox reaction? I got 1 mols for this...but i think it'...
November 21, 2011 by Anonymous

Chemistry
Determine the concentration in parts per million if 0.500 moles of NaCl are found in 35000g of a salt water solution. Okay, so I've done questions dealing with ppm and was able to work them out fine, but I can't seem to figure this one out. Any help you can give me would be ...
March 24, 2012 by Hannah

Chem 2
So i need to calculate the pH of 50ml water (de-ionized) with 1 ml of 1M HCl. So the moles of HCl i think is .001 divided by the total amount of solution (.051). I get 0.0196, then i take the negative log of this number and it comes out to 1.71 roughly. Does this sound right? ...
October 14, 2013 by Kyle

Chemistry
Calculate the standard reaction Gibbs free energy for the following cell reactions: a.)3Cr3+(aq) + Bi(s)= 3Cr2+(aq) + Bi3+(aq) with Ecell=-.61V b.)Mg(s) + 2H20(l)=Mg2+(aq)+H2(g)+2OH-(aq) with Ecell=2.36 V I know the formula. I just need help figuring out n (change in number of...
February 27, 2014 by Anonymous

Chemistry
When 0.320 moles of NH4Cl is dissolved in 1.00 L of water, the temperature drops by 13.7 degrees C. What is the heat of solution of ammonium chloride? The solution has a density of 1.0012 g/mL and a specific heat of 0.9818 cal/g degrees C.
April 6, 2010 by adam

chemistry
if you have a reaction with an acid dissociation, where one HA goes to H + A how can the entropy be negative? I thought that one mole going to two moles would have positive entropy because of the greater disorder.
April 19, 2010 by carla

physics
10 moles of a gas initially at temperature 300 K is compressed adiabatically from a volume of 2 cm3 to a volume of 325 cm3. To the nearest tenth of a joule what is the work done by the piston? (It is a monatomic ideal gas.)
October 26, 2010 by sandhu

Chemistry
using the balanced reaction equation for the combustion of propane, determine the number ofmoles of oxygen that would react with.50 mol propane and the number of moles of carbon dioxide that would be produced?
January 9, 2011 by Blake

Chemistry
How do you calculate the following: Starting with a liter of 1M sodium acetate (pka of acetic acid = 4.75 ), calculate the number of moles of strong acid or strong base needed to make a pH buffer effective at pH = 4.o ? Thank you!
June 29, 2011 by Maria

Chemistry
2.8g of iron() reacted with 100ml of 2M sulfuric acid. A.Which reactant is in exces? B. What volume of hydrogen gas is produce at RTP? C. How many moles of iron sulfate is produced? D. How many atoms of hydrogen gas were evolved?
June 6, 2012 by Jeconiah

Chemistry
2.8g of iron() reacted with 100ml of 2M sulfuric acid. A.Which reactant is in exces? B. What volume of hydrogen gas is produce at RTP? C. How many moles of iron sulfate is produced? D. How many atoms of hydrogen gas were evolved?
June 6, 2012 by Jeconiah

chemistry
If 5.30mL of 0.1000 M NaOH solution is needed to just neutralize excess acid after 20.00 mL of 0.1000 M HCl was added to 1.00 g of an antacid, how many moles of acid can the antacid counteract per gram?
March 3, 2013 by Liz

Chemistry
What am i supose to do here? A chemist performs the following experiment: 2FeCl3 + 3CaCO3 ---> Fe2(CO3)3 + 3CaCl If he starts with 105g FeCl3 and excess CaCO3 how many grams of CaCl2 will he obtain? Thanks, ~Nick
January 18, 2009 by Nick

Chemistry
Given the thermochemical equation: 2ZnS(s) + 3O2(g) 2ZnO(s) + 2SO2(g) GH = --879 kJ Calculate the heat evolved (in kJ) when 560 grams of ZnS is converted to ZnO. Please explain throughly with answers.
June 15, 2010 by Shayla

chem
Determine the mass(in grams) of each of the following compounds. a) 0.709 mol magnesium fluoride i got 30.7grams but it was wrong. id appreciate the help! thanks! also if i end up getting the help i have a couple other questions
November 9, 2010 by hannah

Chemistry
the equation is TiCl4 + O2 (yields) TiO2 + 2Cl2. How much titanium(IV) chloride must react with excess oxygen to prepare 175 grams of the pigment? The reaction is found to be 85% efficient? (%yield)??
February 15, 2012 by Michelle

AP Chemistry
We drop 30 grams of magnesium into 770 mL of a 4 M HCl solution. What is the maximum volume of dry hydrogen that could be produced by this reaction at STP? Mg(s) + 2HCl(aq)→MgCl2(aq) + H2(g) Answer in units of liters
February 16, 2014 by Gabriella

chemistry chem science
A portable CD player that draws 160 milliamperes of current is powered by Ni-Cd rechargable batteries. Compute the mass of Cd consumed when a disk is played for 35 minutes. (enter your answer in grams)
May 2, 2014 by luna

Gen Chem
In an experiment I used .139 grams of an Alka Selzter table. A question asks us to determine the amount of CO2 dissolved in 5.10ml of 6M HCl. How do you go about solving such a problem?
November 22, 2014 by Jessica

chemistry
If a mole can dig a mol of holes, how many holes can a mol of moles dig? a. 36 x 1023 b. 3.6 x 1047 c. 6 x 1024 d. 6 x 1046
April 7, 2008 by Sarah

chemistry
26.5 moles of a .2 M aqueous solution of NaOH is required to titrate 50 ml of an aqueous solution of HNO3, what is the concentration of HNO3. I don't want the answer, I want to know how to do it.
March 14, 2011 by Daniel

chemistry
26.5 moles of a .2 M aqueous solution of NaOH is required to titrate 50 ml of an aqueous solution of HNO3, what is the concentration of HNO3. I don't want the answer, I want to know how to do it.
March 14, 2011 by Daniel

Chemistry
If the 3 moles of Calcium Nitride was then dissolved in 2 L of liquid ammonium what would the molarity of the Calcium Nitride /ammonium solution be?
April 15, 2012 by moata

Chemistry
0.200 moles of NaF are added to 1L 2.0 molar HF. The Ka = 7.2*10^-4. What is the pH? a) 2.14 b) 6.70 c) 10.80 d) 3.00 e) 7.00 I got 4.14. pH = -log(Ka)-log([NaF]/[HF]) ==> pH = -log(7.2*10^-4)-log(.2/2) ==> pH = 4.14 Or did I do something wrong?
April 29, 2012 by Zac

Chemistry
What is the pressure of a sample of Chlorine gas if the gas sample contains 0.25 moles of Chlorine and has a volume of 150 L with a temperature of 25 K?
May 13, 2012 by Amanda

General Chemistry
Calculate the number of C atoms, H atoms, and O atoms, in 1.50 grams of glucose (C6H1206).
May 17, 2010 by Kendra

chem
i need to convert the following number of atoms into grams d. 1 million atoms of Br bromine e. 3x10^23 atoms of Ne neon
January 3, 2008 by hope

Chemistry
How much volume in liters will 100.0 grams of oxygen occupy at 100 degrees celcius and 100 atm pressure?
February 15, 2008 by Mark

Chemistry
determine the final temp when 45.8 g of aluminum at -5.2 degrees C is added to a mixture of 45.0 grams of ice at 0.00 degrees C and 2000.0 g of water at 95.0 degrees C.
November 20, 2009 by Brittany

Chemistry
Silicon Carbide, SiC,is prepared using the chemical reaction: SiO2 + 3C ---> SiC +2CO How many grams of SiC can be produced from 15.0g of C? Thanks!
February 15, 2012 by Fisher

chem
A solution is prepared by dissolving 75.0 grams of sucrose (C12H22O11) in enough water to produce 1.00L of solution. What is the molarity of this solution?
December 3, 2012 by antu

Chemistry
0.356 grams of an unknown metal reacts with oxygen to form 452 milligrams of the metal oxide. Identify the metal
April 24, 2013 by Kamal

Chemistry
The density of methanol is .7918 g/ml/ How many grams of methanol do I have to add to 35.0ml of water to make a solution containing 25% methanol?
September 7, 2013 by DD

AP Chem
Sulfuric acid (H2SO4) is a very strong diprotic acid. If 0.054 moles of sulfuric acid is mixed with water to make 667 milliliter of solution,what is the molarity of H+? Answer in units of M doing mole/liter doesn't work
April 1, 2012 by Nick

chemistry
A flask containing 5ml of 3M hcl solution required 14.45ml of 1M NAOH for titration. How many moles of hcl are present in the solution. The density of 3M hcl is 1.05g/ml My calculation 0.005 x 3 = 0.015m 0.01445 x 1 = 0.01445m Who helps me to solve it
September 2, 2012 by Fai

chem
As little as 1.oomg of Arsenic in 1-L of water can kill you. Calculate the following. Assume the density of the solution is 1.00g/cc. a.) How many moles of arsenic in 1 mg? b.) What is the mass percent of the solution? c.) What is the concentration in ppm and ppb? d.) What is ...
December 8, 2012 by Tricia

Chemistry - check answers
1) Which of the following sets is arranged according to increasing base strength? A) F-, OH-, Cl- B) F-, Cl-, OH- C) OH-, F-, Cl- D) OH-, Cl-, F- E) Cl-, F-, OH- (my answer) 2) What is the pH of a solution formed by adding 4.3 x 10^-5 moles of KOH in 1 L of water? A) 4.3 x 10...
April 30, 2014 by Amanda

Chemistry (Acids and Bases)
I just did a lab on Acids and Bases and I am having trouble with the lab questions I was given to complete. Concentration of NaOH: 0.09999 M Volume of NaOH: 3.25 mL # moles of NaOH: 0.325 moles Initial Concentration of Weak Acid: ? (How do we calculate this) Part 2: Hydrolysis...
March 29, 2009 by Lalu

chemistry
A 2.760 g sample of carbon was burned, yielding 10.120g of carbon dixode. How many grams of oxygen was taken up by the reaction? What ofrmula would I use to solve this problem?
September 27, 2007 by pat

Chemistry :)
Question: C25H52(s) + 38O2(g)----> 25CO2(g) + 26H2O How many liters of carbon dioxide are made when 23.4 grams of paraffin (C25H52)burns? I got 13,000 for my answer. Is that right?? Thanks:)
January 28, 2008 by Miley

Chemistry
Using the reaction below, calculate how many grams of bromine gas are necessary to produce 1.00mL of hydrogen bromide gas at STP. H`2 + Br`2 -> 2 HBr where `2 is a subscript two.
March 10, 2008 by Dean

solubility graph
A mass of 30 f of potasium nitrate is dissolved in 100 cm3 of water at 100gC. How many more grams of potassium nitrate must be added to saturate the solution?
November 10, 2008 by tony

Physics
A nickel has a mass of 5 grams. If this mass could be converted completely into electrical energy, how long would it keep a 100 Watt light bulb lit?
May 6, 2009 by Anonymous

chemistry
Use the following reaction to answer the questions 4Fe(s) + 3O2(g) 2Fe2O3(g) H = -1700 kJ How many kJ are released when 2.00 g Fe react? How many grams of rust form when 453 kJ of energy are released?
June 12, 2009 by kylie

chemistry
How many grams of iron(III) nitrate.9H2O could be formed from the reaction of 3.676 g of iron with excess HNO3? Please can u explain? i try balance the question i couldnt.
March 25, 2010 by ALi

Chem
NaOH + HCl --> NaCl + H2O What is the amount of heat absorbed by water? given: mass: 102.2 grams specific heat: .9601 cal/g degrees C
April 6, 2010 by Janae

chemistry
how many joules are required to heat a frozen can of juice (360 grams) from -5C (the temperature of an overcooled refrigerator to 110C) the highest practical temperature within a microwave oven?
May 13, 2010 by Kelly

Chemistry
The problem on my homework is: What mass in grams of iron metal is required to react with 2.50 L of .1500 M of sulfuric acid to produce 18.35g of iron (III) sulfate? please help!
May 23, 2010 by Lauren

Chemistry
Calculate the mass in grams of hydrgen chloride produced when 5.85 L of molecular hydrogen measured at STP reacts with an excess of molecular chlorine gas. H2 + Cl2 ---> 2HCl
June 20, 2010 by Anonymous

Chemistry
Please help I am 11 and lost.y question is a piece of tungsten has a volume of 5.2cubic centimeters and and mass of 100 grams. What is the density of tungsten? I am in sped class don't understand how to solve it.
September 27, 2010 by Alex

Chemistry
Calculate the molarity of a solution made by dissolving 0.680 grams of Na2SO4 in enough water to form exactly 940 mL of solution. Please show me how to solve
October 7, 2010 by Veronica

Chemistry
A mixture of gases collected over water at 14C has a total pressure of 1.198 atm and occupies 72 mL. How many grams of water escaped into the vapor phase?
October 15, 2010 by Megan

science
How much heat is absorbed by a persons hand if 100 grams of steam at 100c is first converted to liquid at 100c and then cooled to normal body temperature?
October 17, 2010 by Alley

chemistry
Find the mass of sodium hydroxide needed to neutralize enough nitric acid to create 2.0 grams of sodium nitrate? How do I write out equation and solve?
November 30, 2010 by Tosha

chem
can you explain? For each of the reactions shown, calculate how many grams of the product form when 16.8 g of the reactant in bold completely reacts. Assume that there is more than enough of the other reactant. 4 Cr(s) + 3 O2(g) 2 Cr2O3(s) thanks
December 6, 2010 by hannah

chemistry
A 150.0 mL flask contains 0.391 grams of a volatile oxide of sulfur. The pressure in the flask is 750 mmHg and the temperature is 22C. Is the gas SO2 or SO3?
March 14, 2011 by Rachel

chemistry
The combustion of propane (C3H8)produces CO2 and H20: C3H8(g)+5O2(g) 3CO2(g)+4H2O(g) Calculate the mass, in grams, of H2O that will be produced if 2.5 mol of O2 is consumed.
March 16, 2011 by michelle

chemistry
The combustion of propane (C3H8)produces CO2 and H20: C3H8(g)+5O2(g) 3CO2(g)+4H2O(g) Calculate the mass, in grams, of H2O that will be produced if 2.5 mol of O2 is consumed.
March 16, 2011 by michelle

prep chem
How many milliliters of oxygen 2(g) will be produced at 720mmHg and 17 celsius if 0.460 grams of KClO3 are reacted in the reaction? Formula is 2 KClO3 --> 2 KCl + 3 O2(g) I know to change temp into K
April 18, 2011 by Laura

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