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April 19, 2014

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Number of results: 13,130

Chemistry
If the percent yield was 81.5%, how many grams of aluminum were used to prepare 20.0 g of potassium alum?
Wednesday, February 29, 2012 at 7:27pm by Cynthia

chemistry
objective and conclusion for experimenting a baking sosa - sand mixture for a mole-grams and molecules
Thursday, March 1, 2012 at 8:50pm by Anonymous

chemistry
If 0.0418 grams of Mg are reacted with excess HCl, how many moles of hydrogen gas will be formed?
Monday, March 19, 2012 at 11:24pm by dev

Chemistry
How many grams of H2(g) can theoretically be produced from a 5-g sample of magnesium metal and excess HCl(aq)?
Monday, April 2, 2012 at 12:30pm by Polly

chemistry
Use PV = nRT and solve for T. For n = number of mols, substitute n = grams/molar mass.
Tuesday, April 17, 2012 at 8:52am by DrBob222

Chemistry
A saturated solution of sodium nitrate at 70oC is cooled to 40oC.  How many grams of precipitate are formed?
Sunday, May 6, 2012 at 10:44pm by Leah

CHEMISTRY
You are correct that the reaction consumed 0.709 mols H2O; however, the problem asked for grams.
Saturday, May 12, 2012 at 5:13pm by DrBob222

chemistry
how many grams of c2h6o contain the same number of oxygen atoms as 0.75 mol of h2o?
Monday, June 18, 2012 at 2:47pm by Amanda

Chemistry
how many grams if sulfur must be dissolved into 1L of water to make a 2 molar solution?
Tuesday, August 28, 2012 at 8:24pm by taylor

chemistry
if 14.7g of na reacts with 7.9g og br how many grams of nabr are found
Monday, September 3, 2012 at 12:14pm by Anna

Chemistry
How many grams of Na3PO4 will be needed to produce 625mLof a solution that has a concentration of Na+ ions of 1.50M?
Thursday, October 13, 2011 at 5:04pm by Anonymous

Science
the number of grams of CuSo4 times 5 H2O that will dissolve in 100g of H20 at 100 degrees
Sunday, September 23, 2012 at 4:33pm by Lindsey

chemistry
what is the minimum temperature needed to dissolve 60 grams of K2CR2O7 in 100 milliliters of water?
Tuesday, September 25, 2012 at 8:23pm by Anonymous

chemistry
what is the minimum temperature needed to dissolve 60 grams of K2CR2O7 in 100 milliliters of water?
Tuesday, September 25, 2012 at 8:26pm by Anonymous

math
How much does Jane pay for 1.75 kg of apples at $0.48 per 100 grams?.
Tuesday, October 9, 2012 at 11:37am by Anonymous

Chemistry
How many grams of H2SO4 will be needed to react with 69.3gof NaOH? Can you list steps so I can understand this? Thanks
Wednesday, October 24, 2012 at 6:05pm by Colleen

chemistry
I want to make a 3% potassium sulphate solution. How many grams or mg I need per 100 ml
Wednesday, October 31, 2012 at 12:40am by Leo

Science
If 200ml of water were used instead of 100ml,how many grams of the compound would dissolve at 40c
Thursday, November 1, 2012 at 8:38pm by Luda

CHM111
Mg3N2(s)+6H2O(l) to 3Mg(OH)2(s)+2NH2(g)how many grams of H2O are needed to producce 150g of Mg(OH)2?
Sunday, November 11, 2012 at 12:43pm by Anonymous

Chemistry105
How many grams of NaCI are therein exactely 25.00 mL of a 0.1053 M solution of the salt?
Sunday, November 25, 2012 at 2:15am by Kevin

Chemistry
what molarity does a solution with 17.1 grams of sugar and 500 mL of distilled water have?
Tuesday, September 28, 2010 at 7:16pm by Angie

chemistry
ph of 10 grams of sodium acetate and 100 mL of .5M acetic acid
Thursday, November 29, 2012 at 9:42pm by ryan

Chemistry 3A
Use PV = nRT with n = grams/molar mass. Remember T must be in kelvin.
Tuesday, December 4, 2012 at 4:16pm by DrBob222

chemistry
How many grams of NH2OH are needed to prepare 250mL of a solution with a pH of 9.56? kb=6.6x10^-9
Monday, December 31, 2012 at 7:19pm by sabryna

science
Will a plastic block that has sides that measure 9 cm and its mass is 19.2 grams float on water?
Thursday, January 17, 2013 at 9:15pm by eric

chemistry
Calculate the number of grams of acetic acid present in the mixture after the reaction is complete.
Tuesday, January 29, 2013 at 8:03pm by Anonymous

chemistry
when 2.31 moles of sulfur hexafluoride are synthesized from te elements, how many grams of fluorine were used
Monday, February 4, 2013 at 6:38pm by Anonymous

Science
If you are given a sample containg 1.204 x 10 24 molecules of NaCl, what is its weight in grams?
Tuesday, February 5, 2013 at 5:57pm by DeAnna

CHEM
How many grams of sodium chloride are required to prepare 1.00 liter of a 1.00M NaCl solution?
Thursday, February 7, 2013 at 9:19pm by Lisa

Chemistry
How many grams of Ca3(PO4)2 can be formed from 206 g of calcium nitrate and 140 g of phosphoric acid?
Friday, February 8, 2013 at 6:57pm by Lee

math
Find the density of an object which has a mass of 360 grams and fills a volume of 36 mL.
Tuesday, February 19, 2013 at 9:22pm by heather

Chemistry
Calculate the volume in liters of the gas (O2) at STP if it was massed at 6.75 x 105 grams.
Sunday, February 24, 2013 at 11:30pm by tif

science
A substance has a mass of 12.5 grams and a volume of 9.8 ml.Will the object sink or float in water?
Friday, March 1, 2013 at 11:51am by marshall

chemistry
How do you sole this problem: how many grams of CaCl2 are needed to prepare 7.25 L of .015M solution?
Friday, March 15, 2013 at 1:30pm by Brittany jones

chemistry
how do I calculate the mass of ammonium sulfate formed from the complete reaction of 700 grams of ammonia?
Sunday, March 17, 2013 at 11:02am by Stephanie

Chemistry
How many grams of C6H12O6 must be added to 0.750 kg of water to make a 1.25 m solution?
Wednesday, March 20, 2013 at 1:56am by Samantha

chemistry
what is the total heat lost if you have 8 grams of copper and the temperature changed from 43°C to 36°C
Sunday, March 24, 2013 at 12:02pm by grace

chemsitry
you start with 150.0g of pentane and 500.0L of O2. how many grams of H2O will you make?
Friday, March 29, 2013 at 1:09pm by sonya

Chemistry
How many grams of CaCl2 would be required to produce a 3.5M(molar) solution with a volume of 2.0L?
Saturday, April 27, 2013 at 1:27pm by Sunny

chemistry
24 times 12.45 grams and then change your answer to kilograms by dividing by 1000
Friday, May 3, 2013 at 9:18am by Jack

chem
a grocery store sells vinegar in 1Lbottles. based on your results, how many grams of acetic acid are in a bottle?
Monday, May 13, 2013 at 12:51am by b

Chemistry
How much water, in grams, can be made from 6.82 × 1024 hydrogen molecules? Answer in units of g
Monday, May 13, 2013 at 6:08pm by Anonymous

chemistry
How many grams of carbon dioxide will form if 4.4 g of propane reacts with 16.0 g of oxygen producing 7.2 g of water?
Monday, May 20, 2013 at 10:18am by Ron

Chemistry
Q=mc?T where ?T is the change in temperature in degrees, m is the mass in grams and c is the specific heat capacity of water.
Friday, June 14, 2013 at 1:28am by bonjo

chemistry
If 6 moles 735 of KCLO3 were used,what weight of oxygen in grams would obtained?
Tuesday, August 27, 2013 at 10:25pm by jean reizel

AP Chemistry
percent of iron in ore: 2*atomicmassFe/(formulamassFe2O3) now multiply that by 17.8 grams.
Monday, September 2, 2013 at 5:39pm by bobpursley

Chemistry
If you are making 230.0 mL of 2.70% (m/m) CuSO45 H2O, how many grams of the solute should you use?
Wednesday, September 11, 2013 at 5:30pm by Jade

chemistry
What is the formula for predicting the grams of Aspirin produced from reacting Salicylic Acid and Acetic Anhydride?
Tuesday, November 5, 2013 at 10:37pm by Courtney

chemistry
What is the formula for predicting the grams of Aspirin produced from reacting Salicylic Acid and Acetic Anhydride?
Tuesday, November 5, 2013 at 10:37pm by Courtney

Chemistry
Calculate the mass in grams of 0.000025 Avagadro's number of rhodium atoms (with the steps please)
Wednesday, November 6, 2013 at 8:03am by Anonymous

Math
Ethan is making 12 dozen cookies.The dough has a mass of 2.2kg.How many grams is that?
Wednesday, December 11, 2013 at 5:53pm by Joshua Holt

chemistry
How many moles of protons are present in 7.54 grams of Rubidium? Report your answer to 3 significant figures.
Friday, January 17, 2014 at 1:32pm by kyle

chemistry
3H2+N2=2NH3 if 2.70 g of H2 reacts with jugful of N ,how many grams of NH3 is formed?
Sunday, February 2, 2014 at 12:08pm by Anonymous

AP Chemistry
Use PV = nRT. For n find n for each and add for the total. n = grams/molar mass.
Sunday, February 16, 2014 at 6:53pm by DrBob222

Chemistry
Convert 2.0 L acetylene to grams using density. q = heat evolved = 1299.5 x (g C2H2/26) = ?
Monday, March 24, 2014 at 10:49pm by DrBob222

Chemistry
A sample of 8.44 grams of NaOH is dissolved into 536 mL of aqueous 0.250 M NaOH (assume no volume change). This solution is then poured into 1.96 gallons of water. You may assume that the two volumes can be added.) What is the concentration of NaOH in the final solution? ...
Friday, September 3, 2010 at 10:21pm by Alex

Chemistry
This is a limiting reagent (LR) problem. I know that because amounts are given for BOTH reactants. 2K | i2 ==> 2kI mols K = grams/molar mass mols I2 = grams/molar mass Using the coefficients in the balanced equation, convert mols K to mols KI. Do the same for mols I2 to ...
Thursday, February 6, 2014 at 8:19pm by DrBob222

CHEMISTRY!
Let's see. Why are you using i. i is the van't Hoff factor which is 1 for ethylene glycol. delta T = Kf*m 23.3 = 1.86*m m=23.3/1.86 = 12.527 molal. m = mols/kg solvent 12.527 = mols/10 kg = 125.27 moles. grams = mols x molar mass = 125.27 x 62.068 = 7,775.18 g ethylene glycol...
Tuesday, January 27, 2009 at 7:20pm by DrBob222

Chemistry
Why are you throwing perfectly good numbers away?. I assume the 1 you are using comes from 1.00 grams KHP. Then 1.00/204.44 = 0.004891 moles which you should round to the appropriate number of significant figures. But you apparently just threw away the 891. So (NaOH) = 0....
Wednesday, October 26, 2011 at 10:55am by DrBob222

the big idea of energy KS3
what is the big idea of energy? To A. Einstein, it was that Energy and Mass are equivalent, and that the sum total of both, with a factor called entropy, is constant in the universe. what is the big idea of energy i need help on finding out what the big idea of energy is? ...
Sunday, October 22, 2006 at 3:29pm by blue babe

Chemistry
1.58e-4 what? mL? L? Does it sound reasonable that you can dissolve almost 61 g Mg(OH)2 in less than 1 mL (even less than 1 L)? If you had shown your work I could tell instantly what you did wrong. As it is I sit here and type all this out and let you look and see if you can ...
Tuesday, March 25, 2014 at 5:07pm by DrBob222

chemistry URGENT!
If you take many more chemistry courses you will NOT be able to get away with using lower case for formulas. mgCo3 actually means milligrams carbon + o3 means nothing. To solve the problem, first write the equations and balance them. Al(OH)3 + 3H^+ ==> Al^+3 + 3H2O Mg(OH)2...
Monday, March 7, 2011 at 10:17am by DrBob222

College Chem.
How much will 1 L of glacial acetic acid weigh? 1000 mL x 1.05 g/mL = 1050 grams. How much of that is acetic acid. If it's glacial acetic acid, it is 100% acetic acid so all 1050 g is HC2H3O2. How many moles is that? 1050 grams/molar mass = 1050/60 = 17.50 M. The new concn ...
Monday, March 8, 2010 at 11:15am by DrBob222

Chemistry
Use density to convert mL ethanol to grams. Use density to convert mL H2O to grams. heat gained by ethanol + heat lost by H2O = 0 [mass ethanol x specific heat ethanol x (Tfinal-Tinitial)] + [mass H2O x specific heat H2O x (Tfinal-Tinitial)] = 0 Substitute and solve for Tfinal.
Thursday, February 9, 2012 at 3:34am by DrBob222

chemistry
Determine whether ∆H is equal to, greater than, or less than ∆U for the following reactions. Keep in mind that “greater than” means more positive or less negative, and “less than” means less positive or more negative. Assume that the only significant change in ...
Sunday, February 6, 2011 at 5:23pm by danny

Chemistry
Calculate the empirical formula and molecular formula of a compound that contains only carbon, oxygen and hydrogen and has a molecular mass of approximately 90. g/mol. Upon combustion of 12.0g of the compund with an excess of oxygen, the yield was 1.2 g of water and 5.87 of ...
Thursday, April 22, 2010 at 1:58pm by Anonymous

chemsitry
This is a limiting reagent problem. I know that because amounts for BOTH reactants are given. C5H12 + 8O2 ==> 5CO2 + 6H2O mols C5H12 = grams/molar mass mols O2 = L O2/22.4 = ? Convert mols C5H12 to mols H2O using the coefficients in the balanced equation.. Convert mols O2 ...
Friday, March 29, 2013 at 1:09pm by DrBob222

Chemistry
Ethyl butyrate is an artificial fruit flavor commonly used in the food industry for such flavors as orange and pineapple. It can be produced by the reaction of butanoic acid with ethanol in the presence of an acid catalyst. i) Given 8.45g of butanoic acid and excess ethanol, ...
Wednesday, September 19, 2012 at 9:46pm by grangeH

chem
First, how do you know this is a limiting reagent problem. Because BOTH reactants are given. 1. You have the equation. 2. You have1.25 moles N2 in the problem. 3. Convert 50.0 g oxygen to moles. moles = grams/molar mass. 4. Using the coefficients in the balanced equation, ...
Tuesday, November 9, 2010 at 8:32pm by DrBob222

Chemistry
I looked here on the internet to see what form of Henry's Law you were/are using. Here is a link. http://en.wikipedia.org/wiki/Henry%27s_law It appears you are using pk = c with p in atm, and c in moles/L. a)So pk = c p = 2.4 atm and k = 7.9E-4 Substitute and solve for c. I ...
Friday, December 10, 2010 at 4:13pm by DrBob222

Chemistry
This is a limiting reagent problem. Na2SO4 + BaCl2 ==> BaSO4 + 2NaCl mols Na2SO4 = M x L = ? mols BaCl2 = grams/molar mass = ? Convert mols Na2SO4 to mols BaSO4 using the coefficients in the balanced equation. Convert mols BaCl2 to mols BaSO4--same process. It is likely you...
Thursday, August 9, 2012 at 3:38am by DrBob222

chem2
Dan--I answered parts of your question incorrectly because I did not read the question the right way. Here is what I wrote, along with corrections. Convert 10 oz to grams. There are 28.35 g to an oz. The 283.5 grams you have is correct. (mass ice x heat fusion ice) + [(mass ...
Monday, September 6, 2010 at 11:44pm by DrBob222

AP Chemistry
You must remember the definitions. I'll get you started. M = #moles/liter of solution. m = # moles/kg solvent. %w/w = grams H2SO4/100 g solution. X = moles H2SO4/(moles H2SO4 + moles H2O) For the first one, molarity. density = 1.3294 g/mL. So how much would a liter weigh? It ...
Tuesday, January 5, 2010 at 10:24pm by DrBob222

BIOCHEMISTRY
A. False. Under steady state conditions, the concentrations of intermediates stay the same while the concentrations of the SUBSTRATE and PRODUCT change. Steady state conditions refer to the steady concentrations of of the ES complex not the concentration of the substrate and ...
Friday, January 25, 2013 at 9:18pm by Devron

Chemistry
This is a limiting reagent problem. I know that because amounts are given for BOTH reactants. 1 Write and balance the equation. 2. Convert g O2 t mols. mols = grams/molar mass 3. Convert g C2H5OH to moles. 4a. Using the coefficients in the balanced equation, convert moles ...
Sunday, January 29, 2012 at 6:55pm by DrBob222

Chemistry
first let's see if the chemical equation is balanced. Zn + HCl --> ZnCl2 + H2 since not yet balanced, then we balance it :P Zn + 2HCl --> ZnCl2 + H2 since we are given grams of Zinc, we need to find the mass of Zn from periodic table to convert it to moles. thus Zn = 65....
Friday, April 15, 2011 at 10:23am by Jai

chemistry
I assume you meant acetic acid (and not acidic acid). Also, I assume you mean to add M so that the sentence reads .....1000 mL of a 0.10 M buffer (I have added M). Use the Henderson-Hasselbalch equation. pH = pKa + log [(base)/{acid)] pKa = 4.74 for acetic acid. You want pH = ...
Tuesday, April 20, 2010 at 8:30pm by DrBob222

Chemistry
Write the equation and balance it. Convert 42 g Mg to moles. moles = grams/molar mass Convert 45 g oxygen to moles the same way. Using the coefficients in the balanced equation, convert moles Mg to mols MgO. Same procedure, convert moles Oxygen to moles MgO. The two answers ...
Sunday, October 3, 2010 at 11:39pm by DrBob222

ASAP CHEMISTRY
PV=nRT n=mass/MM =PV/RT MM=mass*RT/PV=.94* so the volume for one mole at STP is 22.4 liters, so here you must have 500/22.4 moles which is almost 23 moles. well, if .94 grams is 23 moles, this must be the a gas made up of quarks, or unknown matter much lighter than hydrogen. I...
Thursday, December 13, 2012 at 2:19am by bobpursley

biology help plz?????????????????
product of The oxidative phosphorylation / electron transport is ? in stage of glucose oxidation a)pyruvate b)oxygen c)water d)NAD e)ATP f)NAD.2H g)carbon dioxide h)ADP CHOSE TWO ANSWER FROM THE FOLLOWING LIST product of Glycolysis is? a)pyruvate b)oxygen c)water d)NAD e)ATP f...
Saturday, February 2, 2013 at 9:51am by centya

Chemistry
Can you tell me if these are right please? When 2.50g of copper reacts with oxygen the copper oxide product has a mass of 2.81g. What is the simplest formula of the copper oxide. I got Cu2O (copper (I) oxide). Aluminum and oxygen gas react to produce aluminum oxide. A.) write ...
Tuesday, October 19, 2010 at 12:04pm by Jason

CHEMISTRY
The 0.00025 for the first one is correct math BUT I made a typo. Of course the 1 should have been a 9. For (9/10^6)=(x/250) x = 9*250/10^6 = 0.00225 I made another typo when I wrote 1,000,000 (million) instead of 1,000,000,000(billion). So (9g/10^9)=(x/250) x = 9*250/10^9 = 2....
Friday, February 12, 2010 at 8:53pm by DrBob222

chemistry
to convert grams to mols you need to know molecular weight from periodic table of each of the elements in the compound. C = 12.011 g/mol H = 1.008 g/mol N = 14.007 g/mol 0 = 15.999 g/mol S = 32.06 g/mol each of these numbers indicates how much 1 mol weighs in grams now in your...
Thursday, May 30, 2013 at 12:15pm by @allthehomework

calculus
The rate at which an amount of a radioactive substance decays is modeled by the differential equation dA/dt = kA, where A is the mass in grams, t is the time in years, and k is a constant. Answer the following. a) If a 100-gram sample of the radioactive substance decays to 95 ...
Monday, March 19, 2012 at 12:43pm by ronnieday

Chemistry
i) Write and balance the reaction. I think the compounds are 1:1 ratio of mols. Convert 8.45 g butanoic acid to mols. mol = grams/molar mass. Use the coefficients in the balanced equation to convert mols butanoic acid to mols of the product. I believe mols butanoic acid = mols...
Wednesday, September 19, 2012 at 9:46pm by DrBob222

chemistry
Check my work. It's late. You want 9900 grams of 14.5 m solution of EtOH. Suppose we wanted to prepare a 14.5 M solution the usual way. We would weigh out 145 moles EtOH and 10,000 g water (10 Kg). (Note that 145 moles/10 kg solvent = 14.5 m.) How much would that SOLUTION ...
Thursday, February 25, 2010 at 8:03pm by DrBob222

Chemistry
mols Fe = grams/molar mass = ? mols O2 = ? mols Fe x (3 mol O2/4 mol Fe) = ? ?mols O2 x molar mass O2 = grams O2.
Friday, September 21, 2012 at 10:23am by DrBob222

Chemistry
Benzoic acid = HBz sodium benzoate = NaBz. Bz^- + HOH --> HBz + OH^- Prepare an ICE chart and substitute into the following: Kb = (Kw/Ka) = (OH^-)^2/(Bz^-) You know Kw and Ka. Use pH to find OH^-. Solve for (Bz^-) = molar concn of sodium benzoate. How much do you wish to ...
Thursday, June 23, 2011 at 10:20am by DrBob222

Math
Can someone explain relating metric units. going form liters to milliliter and kilograms to grams?
Thursday, September 6, 2007 at 5:41pm by Kristine

chemistry
to make 100mL of a solution that is .25M in chloride ion, how many grams of MgCl2 would you need to dissolve
Saturday, September 15, 2007 at 4:17pm by samantha

chemistry
o make 100mL of a solution that is .25M in chloride ion, how many grams of MgCl2 would you need to dissolve
Sunday, September 16, 2007 at 9:58am by samantha

Chemistry
Express each quantity as a mass in grams. a) 3.70mol of H2O b) 8.43 x 10^23 molecules of PbO2
Saturday, October 20, 2007 at 1:57pm by Marty

AP Chemistry
Find the grams of NaF added to 300ml of .2M HF to create a buffer with pH=3.5.
Thursday, November 15, 2007 at 6:47pm by corey

ap chemistry
Find the grams of NaF added to 300ml of .2M HF to create a buffer with pH=3.5.
Thursday, November 15, 2007 at 7:59pm by corey

chemistry
Using calories, how much heat will 32 grams of water absorb when it is heated from 25 C to 80 C?
Tuesday, February 5, 2008 at 9:31pm by chelsea

Chemistry
No I know how to balance the equation. But i am having problems determining the mass of O2 that can be produced from 25 grams of HgO.
Tuesday, February 12, 2008 at 4:07am by Killa

chemistry
how many liters of 0.100 M HCL would be required to react completely with 5.00 grams of calcium hydroxide?
Thursday, March 6, 2008 at 10:43pm by mac

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?
Tuesday, April 29, 2008 at 6:59pm by Kiley

Chemistry!
convert the moles to grams, and then for volume, assume denstiy is the same as water (accurate for dilute solutions)
Saturday, August 9, 2008 at 11:54am by bobpursley

chem
The answer above is in grams. You will need to convert it to mg. Also, check the atomic and molar masses.
Saturday, September 20, 2008 at 5:42pm by DrBob222

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