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April 25, 2014

Search: how many grams of O2 are consumed..

Number of results: 5,892

Chemistry
If a solution containing 118.44 g of mercury(II) perchlorate is allowed to react completely with a solution containing 17.796 g of sodium sulfide, how many grams of solid precipitate will be formed? How many grams of the reactant in excess will remain after the reaction?
Tuesday, April 1, 2014 at 11:14pm by Noelle

physics
1. Calculate the frequency (Hz) and energy (eV) of green photons with wavelength of 555nm. Photon energy = hν, where ν = frequency in Hz and h = 6.626x10-34 joule-sec, the Plancks constant. Keep in mind that: wavelengthxfrequency = speed. 2. Andy Ruddick can serve ...
Sunday, March 1, 2009 at 2:44pm by JeFF

chemistry
15.45 grams of solid potassium chlorate decomposes when heated to form potassium chloride and oxygen gas. assuming 100% yeild how many grams of solid potassium will be produced?
Monday, April 11, 2011 at 6:51pm by mary

CHEMISTRY
2NaBrO3 reacts to 2NaBr + 3O2 How many grams of NaBrO3 are required to produce 19 grams of O3? How many liters of 02 are produced from 4 moles of NaBrO3? How many atoms of NaBr are produced when 1 mole of O2 is produced?
Tuesday, May 22, 2012 at 1:49pm by helen

Chem Electron Config
A 10.0-g sample of C2H5OH is burned completely in air. How many molecules of H2O are formed? 3.921023 *How many grams are formed?* did anyone figure out how to get the grams of H2O formed?
Thursday, October 18, 2012 at 3:59pm by Shay

Chemistry
a chemist needs 46 mol of ammonia for a reaction to complete. he has 46 grams available but needs ammonia as a liquid (D=2.4g/ml). does he have enough? ammonia has an atomic weight of 17 grams
Monday, July 12, 2010 at 8:11pm by Marie

Chemistry
a chemist needs 46 mol of ammonia for a reaction to complete. he has 46 grams available but needs ammonia as a liquid (D=2.4g/ml). does he have enough? ammonia has an atomic weight of 17 grams
Monday, July 12, 2010 at 8:11pm by Marie

College Algebra - Chemistry
A goldsmith has two gold alloys. The first alloy is 25% gold and the second is 55% gold. How many grams of each should be mixed to produce 40 grams of an alloy that is 43%?
Saturday, December 11, 2010 at 2:26am by Lyanne

oceanography
14C has a half-life of 5,730 years. If we start with 70 grams of 14C at time zero how many grams of 14C will be left after three half-lives?
Monday, October 15, 2012 at 3:27pm by teal

Chemistry
A student reacted 5.33 grams of cobalt with oxygen gas and obtained 7.50 grams of cobalt oxide. Determine the empirical formula of this cobalt-oxygen compound based upon this experiment.
Wednesday, September 26, 2012 at 11:37am by Timothy

Chemistry
If Chelcy and Allyson reacted 2.55 grams of Mg with excess hydrochloric acid (HCl), how many grams of MgCl2 will they theoretically produce? Mg(s) + HCl (aq) → H2 (g) + MgCl2 (aq) ?g MgCl2
Thursday, January 31, 2013 at 8:57am by star

chemistry
How many grams of oxygen are required to react with 2.50 g of propane (C3H8) to form CARBON MONOXIDE and water? this is what i did why is it wrong? 2.50 g C3H8 x 1 mole / 44.09 g C3H8 x 5mole O2 / mole = 9.1 g O2 everything cancels to get grams of O2 which is what i want so im...
Thursday, January 22, 2009 at 8:32pm by lyne

Chemistry
An empty beaker weighs 42.75 grams. When completely filled with water, the beaker and its contents have a total mass of 399.95 grams. What volume does the beaker hold Use d=1.00 g/ml as the density of water.
Saturday, September 8, 2012 at 6:39pm by Elizabeth Morgan

chem--electrochemistry
So in this reaction: Ag(s) + Fe(+3) --> Ag(+) + Fe(+2) we are given 20 grams of Ag(s) to start off with. How do we find how many electrons are transfered in the reaction. And how many grams of Fe(+2) is formed. *for the latter, i think that we can calculate it through ...
Sunday, March 28, 2010 at 6:04pm by Rav

Chemistry
I still don't understand how to do this problem; grams/molar mass I understand, but I need to see the steps CLEARLY. 43. How many moles are in 25.0 grams of potassium? Show your work and round your answer to the appropriate number of significant figures. Please, please help ...
Saturday, October 23, 2010 at 9:57am by mysterychicken

physics
an atwood machine is set up with m1=234 grams and m2=485 grams. the height of m2 above the floor is 137 cm, and the system is released from rest. the pulley is frictionless. what is the acceleration of this system? what is the tension in the string? how long will it take for ...
Tuesday, November 30, 2010 at 5:49pm by Haley

Chemistry H.
Assume that the nucleus of the fluorine atom is a sphere with a radius of 5 x 10 ^ -13 cm. Calculate the density of matter in the fluorine nucleus in grams/cm^3. Now convert your answer to tons per cubic centimeter, knowing that there are 454 grams in one pound.
Sunday, September 23, 2012 at 9:08pm by Jennifer

chem really need help!
If a solution containing 33.82 g of mercury(II) acetate is allowed to react completely with a solution containing 9.718 g of sodium sulfate, how many grams of solid precipitate will be formed? How many grams of the reactant in excess will remain after the reaction?
Thursday, January 17, 2013 at 9:31pm by Caitlin

Chemistry
1. Nitrogen monoxide is oxidized in air to give brown nitrogen dioxide. Starting with 2.2mol NO, how many moles and how many grams of 02 are required for complete reaction? What mass of NO2,in grams, is produced? Please show the solution step by step. thanks
Tuesday, September 10, 2013 at 5:50am by Mitto

Chemistry Help!
If 100 grams of KClO3 are heated to form KCl and O2 according to the equation KClO3 KCl + O2 (Hint: You need to balance the equation) a. How many moles of KClO3 reacted? b. How many moles of KCl are formed? c. How many grams of KCl are formed? d. how many moles of O2 are ...
Tuesday, February 12, 2013 at 2:24pm by Allison

Physics - Specific heat
#1.) If 500 grams of a metal requires 70 calories of energy to raise its temperature by 10 Kelvin, what is its specific heat? #2.) How much heat is gained or lost when 200 grams of ice melts?
Thursday, October 28, 2010 at 12:24am by Heath

chemistry
The solubility of an ionic compound is 30 grams of compound in 100 mililiters of water. If 60 grams of the compound is dissolved in 200 mL of water, the solution will saturated. t/f
Monday, December 6, 2010 at 11:24am by stella

Chemistry
If 20.0 grams of propane are burned with 50.0 grams of oxygen: What mass of CO₂ is produced? What mass of water is produced? What mass of which reactant was excess? Thank you so much.
Sunday, October 23, 2011 at 5:45pm by Mom

Chemistry
If 20.0 grams of propane are burned with 50.0 grams of oxygen: What mass of CO₂ is produced? What mass of water is produced? What mass of which reactant was excess? Thank you so much.
Sunday, October 23, 2011 at 6:02pm by Mom

Chemistry
If 20.0 grams of propane are burned with 50.0 grams of oxygen: What mass of CO₂ is produced? What mass of water is produced? What mass of which reactant was excess? Thank you so much.
Sunday, October 23, 2011 at 6:06pm by Mom

chemistry
When 7.50 grams of iodine (I2) is added to 48.7 grams of carbon tetrachloride (CCl4), the iodine dissolves and a solution is formed. The weight percent of the iodine in the solution is a) 13.3 % b) 15.6 % c) 60.7 % d) 2.96 % e) 86.0%
Friday, February 3, 2012 at 4:27pm by jimmy

chemistry
Use demensional analysis to convert 4.68 grams of boron to cubic centimeters of boron. The density of boron is 2.34 grams per centimeters cubed
Wednesday, September 26, 2012 at 9:13pm by ange

Chemistry
What is the ( m/m) % concentration of a tin in a solution of 5.000 grams of tin dissolved in 95.000 grams of copper
Wednesday, December 4, 2013 at 11:51pm by Ruffles

chemistry
N2 + 3H2 --> 2NH3 how many grams of hydrogen are needed to react with 50 grams of nitrogen? Three moles of H2 per one mole of N2. How many moles of N2 is 50 grams? 1.79 moles is 50 grams. You do these problems in steps. Step 1. Write a balanced chemical equation. You have ...
Thursday, June 22, 2006 at 1:36pm by Hawk

Pre-Calc
Gold weighs 19.3 grams per cubic centimeter (cc), and silver weighs 10.5 grams per cc. A. Write a formula for the weight of one cc of a mizture of silver and gold in terms of the volume of gold in the cc. B. If one cc of mizture weighs 12.7 grams, what is the weight of gold in...
Wednesday, November 11, 2009 at 5:26pm by Tritanianna

Calculus
In a chemical reaction, substance A combines with substance B to form subtance Y. At the start of the reaction, the quantity of A present is a grams, and the quantity of B present is b grams. Assume a is less than b. At time t seconds after the start of the reaction, the ...
Sunday, April 10, 2011 at 12:23am by Katrina

Chemistry Pretest
Last and final question: Consider the reaction 2KNO3 + 10K ---> 6K2O + N2. If 155 grams of K reacted with 122 grams of KNO3, what is the limiting reagent? a) KNO3 b) K c) Neither d) not enough information I would think it's d? Because it doesn't ask to know either the ...
Friday, September 28, 2012 at 7:19am by Sarah

chem
You wish to prepare an aqueous solution of glycerol, C3H5(OH)3, in which the mole fraction of the solute is 0.093. How many grams of glycerol must you combine with 425 grams of water to make this solution? What is the molality of the solution? PLEASE HELP!
Sunday, November 22, 2009 at 7:19pm by mike

Chemistry
You burned a peanut that weights 5.0 grams underneath a calorimeter with 409 mL of water in it. The thermometer reading increased from 21.6 C to 45.5 C. After burning, the peanut weighs 3.43 grams. How many Joules would be released when 1 gram of peanut if burned?
Tuesday, January 10, 2012 at 11:05pm by Soraya

math check
The amount of fill (weight of contents) put into a glass jar of spaghetti sauce is normally distributed with mean = 843 grams and standard deviation of = 9 grams (ii) Find the standard error of the x distribution. (Give your answer correct to two decimal places.) 21.63 . (...
Friday, June 21, 2013 at 9:35am by Sue7

Chemistry
A compound is known to be a cesium halide, CsX. If 3.00 grams of the salt is dissolved in exactly 100.0 grams of water, the solution freezes at -0.735C. What is the chemical formula for the salt? i know it would be -0.735= -1.86 * m m= 3g/ X g/mol/kg solvent however the ...
Thursday, February 20, 2014 at 9:00am by Susy

Chemistry
a mixture of 34.0g of ammonia and 50.0g of elemental oxygen react to form elemental nitrogen and water. Please write a balanced chemical equation for this reaction. Find the theoretical yield of water in grams and give the amount of excess reactant in grams
Monday, March 3, 2014 at 7:22pm by Tra

Chemistry
What is the molarity of the resulting saline solution when you mix 1 mole HCl with 1 mole NaOH? I'll provide some basic information that I know, but could somebody tell me how to get the answer using the data? The balanced reaction is as follows: HCl+NaOH->H2O+NaCl Molar ...
Saturday, March 8, 2008 at 5:21pm by Andrew

Chem
1) Mg + F2 = MgF2 10.00 grams of magnesium reacted with fluorine to produce MgF2 Find : a) Balance the reaction b) How many grams of fluorine reacted with magnesium. Answer:____________ c) How many grams of MgF2 were formed in the reaction. Answer:____________
Sunday, December 2, 2012 at 4:10pm by Malina

Programming
Submit pseudocode and a flowchart for the following programming exercise: Fat Gram Calculator Design a program that asks for the number of fat grams and calories in a food item. Validate the input as follows: - Make sure the number of fat grams and calories are not less than 0...
Thursday, August 19, 2010 at 8:28pm by johnny

Computer programming
Submit pseudocode for the following programming exercise: Fat Gram Calculator Design a program that asks for the number of fat grams and calories in a food item. Validate the input as follows: - Make sure the number of fat grams and calories are not less than 0. - According to...
Monday, April 4, 2011 at 8:48pm by Viper

science
When substances such as sugar and table salt are dissolved in water, the freezing points of the new solutions are lower than the freezing point of water. Also, the more material dissolved, the lower the freezing point. The boiling points of these solutions, however, are higher...
Wednesday, May 12, 2010 at 8:29pm by kayci

chemistry
Silver nitrate (AgNO3) reacts with sodium chloride as indicated by the equation AgNO3 + NaCl ! AgCl + NaNO3 . How many grams of NaCl would be re- quired to react with 511 mL of 0.38 M AgNO3 solution? Answer in units of grams
Wednesday, September 19, 2012 at 4:40pm by cheri

Chemistry
For chemistry I am supposed to convert 0.001 348 grams to milligrams. I know how to convert grams to milligrams, but I don't get what's with the 0.001. Does this mean it should be .348 grams to milligrams (multiplying by .001??) Thanks
Wednesday, February 18, 2009 at 7:20pm by Dalia

Chemistry
Calculate the number of grams of water produced from 30 g of oxygen gas. List only the number of grams of water. First, you will need to balance the equation above. Round to the nearest hundredth. And, as always, don't forget the units.C6H10+O2---->CO2+H2O
Thursday, August 5, 2010 at 5:23pm by Jarred

Chemistry
1. The organic compound triphenylmethane (C19H16) when pure melts at 171.04 degrees c. When 1.92 grams of hexachlorobenzene (C6CL6) is mixed with 3.74 grams of triphenhlmethane, the melting point of the mixture is 163.19 degrees calcius. Calculate the freezing point depression...
Monday, December 17, 2012 at 9:48am by Nad

science
A biochemist used 10.000 grams of P-32 in a test on plant growth but forgot to record the date of his experiment. When he measured the amount of phosphorus-32 on another day, he found only 1.250 grams of the isotope remaining. If the half-life of P-32 is fourteen days, when ...
Monday, April 8, 2013 at 9:01pm by Candace

Chemistry
How many grams of Fe are in 6.6 g FeO. (Remember the percent Fe in FeO is the grams of Fe in 100 g of FeO)
Thursday, March 29, 2012 at 11:09am by Ambra

Chemistry
Suppose 2 grams of an unknown metal carbonate MCO3 is reacted with excess HCl and 0.88 grams of CO2 are produced. What is the atomic mass (molar mass) of the unknown metal M? What element is it?
Sunday, October 7, 2012 at 10:56pm by Anonymous

ap chemistry
Consider the following unbalanced reaction. P4(s) + F2(g) PF3(g) How many grams of F2 are needed to produce 212 g of PF3 if the reaction has a 79.8% yield? I did 212/.798=265.66 grams do I convert that to moles next?
Thursday, August 1, 2013 at 4:26pm by Kris

science
iron (III) oxide is formed when iron combines with oxygen in the air. how many grams of Fe2O3 are formed when 16.7g of Fe reacts completely with oxygen? 4Fe(s) + 3O2(grams) => 2Fe2O3(s)
Thursday, January 31, 2008 at 8:40pm by cambell

chemistry
the fuel methanol(CH3OH) is made by the reaction of carbon monoxide and hydrogen. a) write the balanced chemical reaction b)how many grams og hydrogen are needed to produce 45.0 grams of methanol?
Sunday, February 24, 2008 at 7:37pm by g3mini

Chemistry
4.00 grams of NaOH have been added to 2.0 liters of water. The molarity of this solution is ____M. the concentration of this solution is ______ grams of NaOH per liter of water
Friday, August 6, 2010 at 10:50am by Maria

Chemistry
The molal freezing point constant(Kf) for acetic acid is 3.90 C/m. When 31.5 grams of unknown solute is dissolved in 650 grams of acid the freezing point is lowered by 0.79 what is the molar mass
Thursday, March 7, 2013 at 1:48pm by Chris

Chemistry
Calcium oxide can be prepared by heating calcium metal in oxygen according to the reaction: 2Ca+ O(2) --> 2CaO. How many grams of calcium would be needed to produce 15.0 grams of calcium oxide?
Thursday, May 30, 2013 at 5:52pm by Anonymous

chemistry
I need a formula for: 0.5 grams of sodium chloride is dissolved to make 0.05 liters of solution. next 0.5 grams of sodium chloride is dissolved to make 0.05 ml of solution. next 670 grams of Pb (C2H3O2)4 are dissolved to make 3.5 ml of solution.
Thursday, May 19, 2011 at 10:15pm by venita

Chemistry
I Have Two Questions 1)How would you calculate the number of nanometers in 8.1 cm? 2)What is the equivalent of 0.35 lb in grams? You need to learn to do deimensional analysis. It's easy. 0.35 lb to grams We know there are 453.6 g in a lb. We take the given (0.35 lb) and ...
Thursday, January 25, 2007 at 3:41pm by Bryan

chem
1. A single mole of AgNo3 weighs 169.88 grams. In order to make a 1M solution, how many grams of AgNo3 would need to be dissolved in 5oomL? How many moles do you need? moles = M x L. please help today
Wednesday, December 1, 2010 at 6:16pm by moon

Chemistry
In a mountainous location, the boiling point of pure water is found to be 95C. How many grams of sodium chloride must be added to 9 kg of water to bring the boiling point back to 99C? Assume that i = 2. So what will my answer be in grams?
Tuesday, March 29, 2011 at 10:26pm by Irma

chemistry
What mass of aluminum hydroxide will be produced when 0.460 grams of aluminum sulfide react with water? How many grams of hydrogen sulfide are produced, according to the following equaton? Al2S3 + H20 -------> Al(OH)3 + H2S
Thursday, January 19, 2012 at 4:20pm by john

chem 1
9.70 grams of nitrogen gas are allowed to react with 5.44 grams of oxygen gas. What is the maximum amount of nitrogen monoxide that can be formed? What amount of the excess reagent remains after the reaction is complete?
Sunday, October 21, 2012 at 2:12pm by kim

chem1 WORD PROBLEM!!
6. how many grams are in 4 moles of Be (OH)3? 7.How many atoms are in 4 moles of C6H12O6? 8.how many moles are in 12.04x10 23 to the power molecules of hamburgers? 9. how many molecules are in grams of Helium gas (He2)? hint:convert then moles then moecules
Thursday, December 6, 2012 at 6:51pm by tyneisha

egg weight
Anyone know the weight of an egg. I need it to do some calculations for my science project. IT depends on the size of the egg. Eggs vary from 35 grams (small egg) to 75 grams (AA large).
Thursday, November 30, 2006 at 8:38pm by Mark

chemistry
9 grams of carbon and 1.5 grams of hydrogen combined with oxygen to make a compond whose mass is 22.5 and whose relative molecular mass is 60.determine the molecular formula
Wednesday, July 29, 2009 at 12:11pm by super_vani

Chem
How many oxygen atoms do you have in 2.00 grams of calcium phosphate? Do you use avogadro's number and how? How many Ca^2+ ions do you have in 2.00 grams of calcium phosphate? Any help would be greatly appreciated.
Wednesday, August 5, 2009 at 9:45am by Josh

Chemistry
The combustion reaction of acetylene gas is represented by this equation: 2 C2H2(g) + 5 O2(g) ==> 4 CO2(g) + 2 H2O(g) How many grams of CO2 and grams of H2O are produced when 52.0g C2H2 burns in oxygen?
Monday, March 22, 2010 at 7:26pm by Ralph

Chem
4C3H5N3O9 -> 6N2 + 12 CO2 + 10H20 + O2 a) how many grams of water would be produced if 75 g of nitroglycerin decompose? b) The creation of 3.89 moles of CO2 would require how many grams of nitroglycerin?
Saturday, October 9, 2010 at 5:48pm by MAX

Chem
A mixture of chromium and zinc weighing .362 g was reacted with an excess of hydrochloric acid. After all the metals in the mixture reacted 225 mL of dry hydrogen gas was collected at 27 C and 750 torr. Determine the mass percent Zn in the metal sample. [Zinc reacts with ...
Sunday, February 25, 2007 at 5:26pm by Jim

chemistry
A sample of CH2F2 with a mass of 19g contains _________ atoms of F CH2F2= 52.03 x = grams of F x/19 = 38/52.03 x= 13.88 grams 13.88/38 = 0.365 moles 0.365*6.02x10^23 = 2.2x10^23 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ But it tells me that that answer is wrong so what did I ...
Friday, August 29, 2008 at 2:42am by O'Neal

AP Chemistry
Summary of problem Photosynthesis uses CO2 & H20 to make C6H12O2. If a plant has 99 grams of CO2 & 68 grams of H2O for photosynthesis, what's the balanced equation, the mass of glucose made, & the mass of excess?
Thursday, October 7, 2010 at 7:36pm by Alex

chemisrty
Q5) The reaction for the combustion of propane is as follows: C3H8 + 5O2 ---->>3CO2 + 4H2O 1. If 20.0 g of C3H8 and 20.0 g of O2 are reacted, which is the limiting reactant? 2. How many grams of H2O can be produced? 3. How many grams of the excess reactant remains at the...
Monday, January 16, 2012 at 4:44pm by lyan

chemistry
if 27 grams of ice at 0 degrees celsius is added to 123 grams of water at 100 degrees celsius in an insulated container, calculate the final temperature. assume specific heat of water is 4.184 J/K g
Thursday, October 4, 2012 at 8:32pm by Gabriel

Stat 1
Seventy million pounds of trout are grown in the U.S. every year. Farm-raised trout contain an average of grams of fat per pound, with a standard deviation of grams of fat per pound. A random sample of farm-raised trout is selected. The mean fat content for the sample is grams...
Wednesday, October 20, 2010 at 1:49am by sam

statistics
Seventy million pounds of trout are grown in the U.S. every year. Farm-raised trout contain an average of 32 grams of fat per pound, with a standard deviation of 7.5 grams of fat per pound. A random sample of 34 farm-raised trout is selected. The mean fat content for the ...
Sunday, October 23, 2011 at 8:45am by Jen

statistics
Seventy million pounds of trout are grown in the U.S. every year. Farm-raised trout contain an average of 32 grams of fat per pound, with a standard deviation of 7.5 grams of fat per pound. A random sample of 34 farm-raised trout is selected. The mean fat content for the ...
Sunday, October 23, 2011 at 8:46am by Jen

Physics(Please just check, thanks)
Using a force table the direction and magnitude had to be found for the following measurements: F1 = 200 grams at 30 degrees; F2 = 200 grams at 120 degrees The magnitude and direction found was 280 grams at 257 degrees. Using the magnitude and direction of F1 and F2 I need to ...
Monday, September 24, 2012 at 10:42pm by Hannah

Chemistry
The heads of matches are made with P4S3. this material is made by heating a mixture of red phosphorus and sulfur: 8P4 + 3S8----> 8P4S3 If a match company uses 5435 grams of phosphorous (p4) with an excess of sulfure, how many grams of P4S3 can be made?
Tuesday, October 21, 2008 at 11:19pm by karen

Chemistry
Silver nitrate (AgNO3) reacts with sodium chloride as indicated by the equation AgNO3 + NaCl ! AgCl + NaNO3 . Howmany grams of NaCl would be required to react with 518 mL of 0.543 M AgNO3 solution? Answer in units of grams
Tuesday, October 4, 2011 at 8:45pm by Broy

chemistry
Zinc metal reacts with hydrochloric acid (HCl) according to the equation: Zn(s)+HCl(aq)=ZnCl2(aq)=H2(g) How many grams of H2 are produced if 100 grams of zinc reacts?
Monday, April 12, 2010 at 4:58am by Duaine

chemistry
A student takes 26.0 grams of Nickel II chloride and mixes it with 10.0 grams of sodium hydroxide. How much nickel II hydroxide will be produced given the student has a 4.80% error?
Monday, May 31, 2010 at 7:59pm by Tameka

Chemistry
Urea, (NH2)2CO, is dissolved in 73.5 g of water. The solution freezes at -0.095C. How many grams of urea were dissolved to make this solution? (Answer must be in grams)
Tuesday, March 29, 2011 at 10:27pm by Irma

Stiochiometry
15.8 grams of NH3 and excess O2 produces NO gas and H2O. 12.8 grams of NO gas was produced. Find the percent yield. Balanced Equation: 4 NH3 + 5 O2 -> 4 NO + 6 H2O
Sunday, May 15, 2011 at 2:25pm by Mikey

Chemistry
How many grams of Na-benzoate (powder) do I need to prepare a buffer with pH = 4.2? How many grams of salt (NaCl) do I need to add to this buffer to make it a saturated solution of the salt? Thanks
Thursday, June 23, 2011 at 10:20am by Ele

physics
what is the equilibrium temperature if 100 grams of water at 20 degrees celsius is added to 50 grams of water at 62 degrees celsius in an insulated container of negligible mass?
Sunday, June 17, 2012 at 3:49pm by tony

Math
A house mouse has a mass of 12 grams. If you put a mouse on a scale, how many paper clips would be needed to balance it if a paper clip has a mass of 12 grams?
Friday, May 31, 2013 at 6:00pm by Anonymous

stats
In order to make sure that their bags of chips are of sufficient weight, the Chipper Chip Company try to fill their 200 gram bags of chips with more than 203 grams. You have been given the task of investgating what proportion of bags produced do have over 203 grams of chips in...
Friday, October 22, 2010 at 6:00am by lollzzz

Physics
How many grams of ice must be added to 100 grams of water at 60 degrees so that its temperature drops to 20 degrees celcius? As far as i know I have to use: (Mass)*(specific heat of water) *(finaltemperature - initial temperature = ??
Thursday, January 7, 2010 at 10:36am by Jose

Chemistry
Given the balanced equation representing a reaction: Cao(s) + CO2(g) ---> CaCO3(s) + heat What is the total mass of CaO(s) that reacts completely with 88 grams of CO2(g) to produce 200. grams of CaCO3(s)? I don't understand what you have to do.
Saturday, December 18, 2010 at 5:01pm by danny123

statistics
determine the probability that a sample of 49 boxes will have a mean weight below 365 grams. past records show that the population mean is 368 grams and the population standard deviation is 7. the probability will be between.
Wednesday, November 30, 2011 at 11:08pm by wanda

chem
A solution is prepared by dissolving 25 grams of sodium sulfate in enough water to give a total volume of 500. mL. The molar mass of sodium sulfate is 142 grams per mole. What is the molarity of the solution?
Wednesday, November 14, 2012 at 7:01pm by jennifer

chemistry
write the balanced equation for the reactions of aquesous pb(CIO3)2 with aqueous Nal. include phases. 2.If a solution containing 86.044 g of mercury(II) chlorate is allowed to react completely cointaing 15.4888 g of sodium sulfide, how many grams of solid precipate will be ...
Tuesday, September 24, 2013 at 9:11pm by christina

Chemistry (Check)
Classify each of these statements as always true, sometimes true, or never true. 7____AT____It is necessary to know the formula of a compound in order to calculate its percent composition. 8___ST_____If the percent by mass of carbon in methane, CH4, is 75%, then 100 grams of ...
Sunday, February 11, 2007 at 3:48pm by Bryan

Chemistry
Xe(g) + F2(g) ----uv light---> Xe F2(s) XeF2(g) + 2F2(g) ---catalyst---> XeF6(s) XeF6(s) + H2O(l) ------> Xe O3(s) + 6HF(g) Looking at these three reactions respond the following: a) For each 0.0250 grams of xenon hexaflouride that reacts, what mass of water is ...
Sunday, January 22, 2012 at 11:02pm by Alexandra

science
When substances such as sugar and table salt are dissolved in water, the freezing points of the new solutions are lower than the freezing point of water. Also, the more material dissolved, the lower the freezing point. The boiling points of these solutions, however, are higher...
Wednesday, May 12, 2010 at 6:56pm by kayci

chemistry
What mass in grams of potassium hydroxide is contained in 500 mL of solution that has a pH of 11.5? I have a pOH of 2.5 to get [OH] I do 10^-2.5 to get 0.001581138 Then I divide this by 2 to find the mols in 500 mL Then, grams = mols x molar mass = 0.00158``38 x 56.105 g/mol =...
Monday, April 7, 2008 at 5:39pm by Dustin

Chemistry Electrolytes
What is the total number of ions formed when 2.00 grams of calcium chloride are dissolved in 100 grams of water. (Ignore any ions formed by the water). Note, this is a bit of a trick question. Read the problem carefully.
Monday, June 1, 2009 at 6:54pm by Gweedo8

chemistry
How many grams of gaseous required? If 0.260 mol of solid C and 20.0 g of solid TiO2 are reacted stoichiometrically according to the balanced equation, how many grams of gaseous Cl2 are required? 3TiO2(s) + 4C(s) + 6Cl2(g) → 3TiCl4(l) + 2CO2(g) + 2CO(g)
Wednesday, February 17, 2010 at 3:11pm by Louis

Chemistry
In an industrial process, the following reaction is carried out in the presence of a catalyst: C16H65 + Cl2 C16H65Cl12 Calculate the percentage yield if 164.57 grams of C16H65 are used in the reaction and 400.24 grams of C16H65Cl12 are produced.
Friday, November 19, 2010 at 10:11pm by stacy

Chemistry 1
How many grams of a stock solution that is 92.5 percent H2SO4 by mass would be needed to make 250 grams of a 35.0 percent by mass solution? Can you please teach me how to do this? I get the other stoichiometry stuff, but this one tripped me up because I don't know how to set ...
Tuesday, February 1, 2011 at 8:10am by Brittany

Chemistry
If 33.6 grams of KCl are dissolved in 192 grams of water, what is the concentration of the solution in percent by mass? AND if 2.1 moles of CaCl2 are dissolved in enough water to make a .92 liter solution what is the resulting molarity? Please help and explain or anything?!
Tuesday, March 27, 2012 at 7:05pm by Dr. David

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