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April 20, 2014

Search: CHEM !(MOLE) PLZ HELP!

Number of results: 22,461

chem
stilll didnt get it .. .. can u plz explain in detail ... how did u get the answer.. plz plz plz plz plzp l zp thnks Bond enthalpy is the energy required to break a mole of a certain type of bond. O=O = 495 kj/mol S-F = 327 kj/mol S=O = 523 kj/mol Use average bond enthalpies ...
Wednesday, November 12, 2008 at 11:54pm by DR BOOBB Plz HELP

CHEM !(MOLE) PLZ HELP!
1.How many grams are in one mole silicon? 2. how many moles are in 128 grams of oxygen gas (O2)? 3.How many molecules are in 2 moles of AIO? 4.How many moles are in 18.06 x 10 to the 23 power? 5. how many moles are in 100 grams of CH4?
Thursday, December 6, 2012 at 6:47pm by tyneisha

Urgent Chem help plz
is answer +103 KJ.. plz chk Plz explain in detail.... i tried to search on internet but i am confused with co-efficents.. how to set up the equaiton .. plz help me ??? Bond enthalpy is the energy required to break a mole of a certain type of bond. O=O = 495 kj/mol S-F = 327 kj...
Wednesday, November 12, 2008 at 11:16pm by Sarah

chem- please check my answer
(5.0ml)x(2.0g/1.08g/ml)x(1 mole S/138g S) x (1 mole Aspirin/1 mole S)x (180g Aspirin/ 1 mole Aspirin) = 12.077 g Aspirin
Sunday, April 20, 2008 at 5:53pm by Sara

Urgent Chem Help someone plz
Calculate the mole fraction of the solute in the following aqueous solutions 3.25% ethanol, by volume (d= 0.993 g/ml ; pure C2H5OH, d= 0.789 g/ml )
Saturday, January 24, 2009 at 1:09pm by Casandara

Chemisty (please read soon)
which will become a buffer in 1L of H2O? a) 0.3 mole KOH & 0.3 mole HBr b) 0.5 mole NH3 & 0.5 mole HCl c) 0.2 mole NaCl & 0.3 mole HCl d) 0.2 mole NaOH & 0.2 mole HBr e) 0.4 mole HC2H3O2 & 0.2 mole NaOH I think that the answer is e. Is that correct?
Sunday, April 29, 2012 at 11:03pm by Zac

Chem Urgent Help
Plz explain in detail.... i tried to search on internet but i am confused with co-efficents.. how to set up the equaiton .. plz help me ??? Bond enthalpy is the energy required to break a mole of a certain type of bond. O=O = 495 kj/mol S-F = 327 kj/mol S=O = 523 kj/mol Use ...
Wednesday, November 12, 2008 at 10:18pm by Sarah

Chem- PLZ HELP!
Consider 100g of 5.5% (mass) solution of NaNO3. Complete the following table, before calculating molarity, molality and mole fraction of NaNO3. Solute(NaNO3)|Solvent(H2O|Soln Mass(g) 100g Moles ---- RefInfo 85g/mol 18.02g/mol Density=1.00g/mol (This goes under "soln" as ...
Thursday, March 3, 2011 at 4:23pm by Kate

College Chem
You should be able to answer each of the questions from the following: 32 g is a mole of O2; 28 g is a mole of N2. Therefore, equal masses will contain more moles of N2. PV = nRT 1 mole contains 6.02 x 10^23 molecules.
Sunday, March 28, 2010 at 12:58am by DrBob222

organic chem
the % given is a % by mass. so they are grams. convert the mass to mole for each element divide each mole with the smallest mole round off the moles to 1 sig figure. then you can name them. the empirical formula is C3H6O. this formula can be an aldehyde and a ketone.
Thursday, June 13, 2013 at 12:19pm by bonjo

chem
The equation tells you that 2 moles of bicarbonate react with each mole of H2SO4 number of moles of H2SO4 6.0 mole L^-1 x 0.034 L= 0.204 mole so 0.408 moles of bicarbonate are needed. The molar mass of NaHCO3 is 84 g mole^-1 so mass of NaHCO3 0.408 mole x 84 g mole^-1 =34 g 2 ...
Saturday, December 11, 2010 at 9:03am by Dr Russ

chem
When one 1 mole of A^- hydrolyzes, it produces 1 mole of HA and 1 mole of OH^-. Or you can make up an ICE chart from your equation. A^- + HOH ==> HA + OH^- initial: A^- = 0.1. HA = 0 OH = 0 change: HA = +x OH^- = +x A^- = -x equilibrium: HA = x OH^- = x A^- = 0.1-x etc. Don...
Wednesday, May 13, 2009 at 10:07pm by DrBob222

word unscramble
plz plz plz plz help me have to give it tommorow. it has to school items only. the four words are that need to be unscramble. 1. EEFILNPPTT 2. AEHIRSSTTW 3.EEHKOSSUY 4. CEGHLMOSTY SO PLZ HELP I REAlly wannt to know what it is plz help.
Thursday, September 28, 2006 at 3:34pm by shruti

chem
Calculate molar mass of C2H6 = 30 g mole Number of moles is then 275 g/30 g mol^-1 = 9.2 mole 1 mole contains 6.02 x 10^23 molecules (Avogadro's number) So number of molecules = 6.02 x 10^23 molecules mole^-1 x 9.2 mole =
Monday, November 14, 2011 at 9:12am by Dr Russ

Chem
At a particular temperature, Kc = 54 for the reaction If 1.0 mole of H2 and 1.0 mole of I2 are placed in a 5.0 L container, what would be the equilibrium concentration of HI?
Monday, March 22, 2010 at 10:22pm by CC

Chem
Could you please tell me if these are right? How many moles are in the following. A.) 80.0 g of NaOH I got 2.0 moles. B.) 12.0 g of Ca(OH)2 I got 0.16 moles. Write the simplest formula for each of the following compounds. A.) 0.200 mole Al and 0.600 Cl. I got AlCl3 B.) 0.080 ...
Tuesday, October 19, 2010 at 12:02pm by Chris

LIVING ENVIRONMENT
the ability to grow in size is a characteristic of living organism .Although an icicle may grow in size over time,it is considered nonliving because there is 1)an incerase in matter ,but no increase in the number of icicle. 2)an interaction between the icicle and the ...
Tuesday, February 12, 2013 at 9:14pm by tania sharmin

chem
since 2 moles of H3PO4 reacts with 3 moles of Ca(OH)2, it takes 2/3 mole for each mole of Ca(OH)2 So, you have .035L*.45mole/L = .01575 moles of Ca(OH)2. 2/3 of that is 0.0105 moles of H3PO4. .0105 mole / (.75 mole/L) = .014L = 14ml
Saturday, February 8, 2014 at 5:35pm by Steve

CHEM
WEll, 1 mole of Calcium nitrate will yield 2 moles of N2O. Each mole of gas occupies 22.4 liters. So 6.8*2*22.4=
Monday, June 21, 2010 at 3:36pm by bobpursley

I NEED HELP!!:(!!!! HELP ME PLZ!!
I GOT A FEW QUESTIONS SO what is a cell part that has the funcion of a gel-like material inside cells... and what releases energy into the cell.?? plz plz plz plz HELP!!!
Tuesday, October 20, 2009 at 8:48pm by i really need help!!

Social Studies
I am doing an ABC book to for Florida and i need a word for the letter X to. IT is due MAY 26 , 2010!!!!!!!!!!!!!!!! I need HELP PLZ PLZ PLZ PLZ PLZ THANKS :)
Friday, May 7, 2010 at 3:55pm by angel

chem
in a. I got 60 L for volume and .8 moles(.2+.6moles. now in b. i got .16 mole so where do I subtract .16 from should I subtract it from .8 moles or from the initial mole which is .2 mole
Thursday, November 1, 2012 at 10:23am by tracy

chem
One mole of H2O(g) at 1.00 atm and 100.C occupies a volume of 30.6 L. When one mole of H2O(g) is condensed to one mole of H2O(l) at 1.00 atm and 100.C, 40.66 kJ of heat is released. If the density of H2O(l) at this temperature and pressure is 0.996 g/cm3, calculate E for the...
Monday, November 26, 2007 at 1:24pm by mel

Chem
yes. or you can write it as 2.0 g A x (1 mole A/10.0 g A) x (3 moles C/1 mole A) = 0.6 mole C. Note that doing it this way, g A cancels with g A to give moles A, then moles A cancel with moles A and the only unit left is moles C which is what you wanted. The factors are ...
Monday, July 6, 2009 at 9:31pm by DrBob222

chem
I will be happy to critique your work. a. energy= mass*c*deltaTemp b. energy/mole= energy/gram*grams/mole
Monday, November 26, 2007 at 1:41pm by bobpursley

chem
ok, your equation seems to be balanced so for every mole of O2 you get (4/5) moles of NO 80 grams O2 / 32 grams/mole = 2.5 moles O2 so 2.5 * 4/5 = 2 moles NO So we also have 2 moles of NH3 If at standard pressure and temp, 22.4 liters/mole 44.8 liters
Sunday, January 25, 2009 at 7:59pm by Damon

chem
Please use conventional symbols as this makes things easier to read and you also practise with the 'language' of the subject. Al(NO3)3 + 4NaOH -> NaAlO2 + 3 NaNO3 +2H2O So 4 moles of NaOH produce 1 moles of NaAlO2. or So 1 mole of NaOH produce 1/4 moles of NaAlO2. We start ...
Friday, September 16, 2011 at 5:36am by Dr Russ

social studies
plz plz plz plz i NEED help! awnser this question plz! my poster is do tomorrow! i NEED help!
Sunday, March 30, 2008 at 8:15pm by mia

chemistry
I would go with the + sign, also. A + B ==> C + D is read as 1 mole of A reacts with 1 mole of B to produce 1 mole of C + 1 mole of D.
Tuesday, February 3, 2009 at 11:38pm by DrBob222

Chemistry
The equation tells you that 1 mole HCl + 1 mole NaOH produces 1 mole NaCl and 1 mole H2O.
Tuesday, April 6, 2010 at 3:03pm by DrBob222

chem
First convert each percentage to grams. 37.51g C x (1 mol C/12.01g C)= 3.123 mol C 4.20g H x (1 mol H/1.008 g H)= 4.17 mol H 58.29 O x (1 mol O/16.00 g O)= 3.643 mol O Since C has the lowest moles divide each mole by the moles of Carbon. C= 1 mole H= 1.34 moles O= 1.167 moles ...
Sunday, November 14, 2010 at 4:14pm by Sarah

chem
The balanced equation shows mole for mole of zinc reacting with coppersulfate, and one gets a mole of copper from the reaction. So convert 454g of copper sulfate to moles. The main difficulty for me is the description of the problem: Copper sulfate is a blue solid....Hmmm. ...
Monday, October 5, 2009 at 12:56pm by bobpursley

Math ....urgent help
i just dont get this elimination method ..... plz help me plz.....teach me how to keep the x and y in a parallel line. and which number to multiply.....plz help -5x-4y=-11 10x=-6-y help me plz......
Wednesday, January 7, 2009 at 5:01pm by vero

biology
a boy inherits genes for tallness,but his growth is limited as a result of poor nitrition. this is an example of 1)an inherited disorder. 2)environmental influence on gene expression . 3)expression of a hidden trait 4)a characterstic controlled by more than one pair of genes. ...
Friday, February 8, 2013 at 12:44pm by tania sharmin

Chem
for every mole of K, you get a mole of KCl. Look at the balanced equation. So, the question is how many moles of K do you have, then when you get that number, for that many moles of KCl, how many grams is that?
Tuesday, December 21, 2010 at 3:39pm by bobpursley

chem
Okay, looking at the reaction that you provided, 1 mole of C6H12O6=2 moles of C2H5OH You placed one mole of C6H12O6 in the vat. Your reaction tells you that you will get 2 moles of C2H5OH for every 1 mole of C6H12O6. C6H12O6 ----> 2C2H5OH+2CO2 We know that 1 mole of a ...
Thursday, March 14, 2013 at 3:40pm by Devron

Chemistry
It depends upon how you define greater. 1 mole NaCl = 1 mole Fe = 1 mole of anything else; however, 1 mole NaCl = 58.5 grams while 1 mole Fe = 55.85 grams and 1 mole H2 = 2 grams.
Friday, March 18, 2011 at 11:09pm by DrBob222

gen chem
What is the boiling point in K of Zn, if the entropy change for evaporation of .8564 mole at its boiling ponit is 95.067K? The heat of vaporization of Zn is 131jk/mole.
Sunday, May 9, 2010 at 5:56pm by chemistry

Chem
each mole of octane produces 8 moles CO2 so, you have 100/114.33 * 8 moles CO2 * 44g/mole
Tuesday, November 20, 2012 at 3:22am by Steve

AP Chem
2 H2O(g) -> 2 H2(g) + O2(g) H2O(g) -> H2(g) + 1/2 O2(g) 1mol 1 mol 1/2 mole each mole H2O has 2 moles of O-H bonds to break (energy requiring) = 2 x 467 = 934 kJ Each mole H2 has 1 mole H-H bonds to make (energy releasing) = 436 kJ Each mole O2 has 1 mole O=O bonds to ...
Monday, November 15, 2010 at 5:21pm by Jeremy

Chemistry
types of stoichiometry: Because chemical reactions are only mole-mole relationships there is really only one. However, you may not be given moles and have to convert mass to moles, or volume to moles Counting that mole to mole mass to mole volume to mole mass to mass volume to...
Monday, January 14, 2013 at 6:15pm by bobpursley

Chemistry
Mole of NaBr=(.893M)(.750L)= .6679 mole mole of Cl2= (1.00atm)(22.4L)=n(.0821)(273.15k) n= .998858 mole How do u determine the limiting reagent?
Friday, February 12, 2010 at 6:32pm by andy

Chem Very Urgent
No limiting reactant? Odd. What was the moles of Na2S? What was the moles of Bi(NO3)3 Now balance the equation. the coefficents tells you the mole ratio you need. What was the mole ratio you had?
Friday, January 8, 2010 at 6:43pm by bobpursley

physics,plz.....give me answer as soon as possible
plz plz plz.....help me
Wednesday, November 24, 2010 at 11:35am by sweetie

chemistry
calculate the mole of HCl using m/Mr calculate the mole for water using the same formula add to two moles to get the total mole of the solution. divide the mole of HCl by the total mole to get your mole fraction.
Tuesday, June 11, 2013 at 8:20pm by bonjo

chem
The molecular formula for iron(III) oxide is Fe2O3. This means that 2 moles of Fe=1 mole of Fe2O3. 22.65g of Fe*( 1 mole of Fe/55.8 g)= moles of Fe moles of Fe*(1 mole of Fe2O3/2 moles of Fe)*(159.69 Fe2O3 g/mol)= mass of the sample
Friday, February 22, 2013 at 2:35pm by Devron

chemistry
Determine the theoretical yield of C when each of the following amounts of A and B are allowed to react in the generic reaction: A+2B-->3C 1) 1mol A; 1 mole B 2) 1mole A; 3 mole B 3) 2mole A; 2 mole B 4) 32mole A; 68 mole B
Wednesday, November 10, 2010 at 11:13pm by rachel

chemistry
SHOW WORK How many moles of helium occupy 26.4 L at a pressure of 103.0 kPa, and 10 degrees Celsius? A.) 0.03 mole B.) 0.86 mole C.) 1.16 mole D.) 32.72 mole
Wednesday, December 4, 2013 at 3:51pm by Caitlyn

General Chem
Nitrogen oxide reacts with oxygen gas to form nitrogen dioxide (NO2). In one experiment 0.866 mole of NO is mixed with 0.503 mole of O2. Calculate the number of moles of NO2 produced
Friday, October 12, 2012 at 12:56pm by Alexis

Chem
98.2 kJ is released for 1 mole H2O2 (and 1 mole is 34 g approximately. You can do it exactly.) Now, how much of a mole is 1 g H2O2? So 98.2 kJ x (1 g/34 g) = ?? kJ energy released for 1 g Hydrogen.
Thursday, November 19, 2009 at 4:29pm by DrBob222

chem
Since HCl + NaOH --> NaCl + H2O each mole of NaOH reacts with one mole of HCl. So, you gotta be asking yourself: How many moles of HCl do I have?
Monday, July 30, 2012 at 3:38pm by Steve

Chem 11
im assuming you mean "moles" not "miles" (4.059g sample/1)x(1 mole sample/g of sample in one mole(take number of elements in formula multiplied by individual grams found in the periodic table)). there is your answer. easy as pie.
Tuesday, January 31, 2012 at 11:19pm by mary

Pre Chem
Triangle heat? Ok, the best I can surmise is that the heat of reaction for 2 moles of ethane is -350kJ. Normally, the heat of reaction is specified per mole of either a product or reactant. It is quite sloppy to do other wise. Assuming 350kJ per 2 moles of ethane, then using ...
Wednesday, April 27, 2011 at 8:39am by bobpursley

science
someone plz plz plz plz plz plz plz plz plz help me!
Friday, February 8, 2013 at 1:24pm by corie

Chemistry
N2 + 2O2 ==> 2NO2 No. You can think of this several ways. 1. The equation tells us 2 moles NO2 are given by 1 mole N2. We must divide 2moles NO2 by 2 to obtain 1; therefore, we must divide 1 mole N2 by 2 to obtain 1/2 mole. 1/2 mole N2 is the answer. 2. Use dimensional ...
Thursday, September 15, 2011 at 5:14pm by DrBob222

Chem 1212
9.19mL of .0956M H2SO4 contains .00919*.0956 = .0008786 moles H2SO4 CaCO3 + H2SO4 = CaSO4 + H2CO3 since each mole of H2SO4 racats with one mole CaCO3, there were .0008786 moles CaCO3 in the tablet. Since each mole CaCO3 has mass 100g, the pill was .08786/.193 = .455 = 45.5% CaCO3
Tuesday, January 22, 2013 at 4:03am by Steve

chemistry
the solute is the HCl because it dissolved in water (a solvent). we have the mass so we can calculate the mole using m/Mr. the mole of water is also m/Mr the mole fraction is the mole of the solute divided by the total mole of the solution.
Tuesday, June 11, 2013 at 8:20pm by bonjo

Chem.. stoichiometry
Obviously the equation is balanced. Each mole of C produces 1 mole of H2. How many moles of C in 34g? That's how many moles of H2 you get. Convert that back to grams. You'll get (34/12) * 2 grams
Friday, May 3, 2013 at 8:28am by Steve

chemistry
16 g oxygen x (1 mole/32 g) = 0.5 mole. The molar volume of oxygen is 22.4 L/mole; therefore, 0.5 mole will occupy 11.2 L at STP.
Tuesday, October 27, 2009 at 10:10pm by DrBob222

chem 1
since N2 + O2 = 2NO, each mole of N2 requires 1 mole of O2. convert your grams to moles, and the molecule with the fewer moles is the limiting reagent.
Sunday, October 21, 2012 at 2:12pm by Steve

Chem
No, you calculated the number of atoms in the molecule. The question is for moles. There are two moles of hydrogen per mole of H2O and one mole 0f oxygen per mole of H2O. Therefore, for 2 moles of H2O, there are 4 moles of hydrogen and 2 moles of oxygen.
Monday, July 6, 2009 at 4:22pm by DrBob222

CHEM
illustrate and calculate the distance each of the following gases would meet on a 12 foot tube: gas A has a molecular weight of 288grams/mole: gas B has a molecular weight of 56 grams/mole
Sunday, December 12, 2010 at 11:03am by damini

Chem
When doing a limiting reagant problem, I need to determine to mole ratio, right? But the problem is if 19.6 g of H3PO4 reacted with 22.4 g KOH... How do I get two separate mole ratios? The answers are: 3/1 for H3PO4 and 3/3 for KOH, but why?
Friday, October 21, 2011 at 9:04am by Em

Climate Graphs
i need a climate graph for japan now plz my teacher will kill me plz plz plz
Saturday, January 13, 2007 at 10:51pm by harry

Chem
1 mole will contain 6.022E23 molecules and occupy 22.4 L at STP. How many moles do you have? 3.8E22/6.022E23 = ?? ?? moles x 22.4 L/mole = xx L.
Monday, November 8, 2010 at 2:46am by DrBob222

chem
Assume you mean to Na+ Na is 23 grams/mole so we have 10^-3 grams (1 mole/23 grams) = .0435 *10^-3 moles .0435 * 10^-3 * 495.8 *10^3 J/mole = 21.6 Joules
Sunday, October 26, 2008 at 2:38pm by Damon

chemistry
Which of the following solutes dissolved in 1000 g of water would provide a solution with the LOWEST freezing point? A. 0.030 mole urea, CO(NH2)2 B. 0.030 mole acetic acid, CH3COOH C. 0.030 mole ammonium nitrate, NH4NO3 D. 0.030 mole calcium sulfate, CaSO4 E. 0.030 mole barium...
Sunday, June 20, 2010 at 3:23am by random

chem/plz/check work studying for a final
Here is a quick check. You have a half mole at near stp. About 11 liters. But in reality, your pressure is about ten percent lower than stp, so volume about 12 liters, and temp is about 5 percent higher, so volume is about 13 liters. I would go with your answer.
Thursday, December 16, 2010 at 10:15am by bobpursley

Chem
plz help :(
Friday, November 7, 2008 at 12:27pm by Vinny

chem...plz help
This doesn't help
Sunday, January 10, 2010 at 5:58pm by Anonymous

Chem
10L of .15M solution contains 1.5 moles NaCl. Each mole of NaCl produces 1 mole of NaOH So, how many grams in 1.5 moles NaOH?
Wednesday, April 17, 2013 at 1:36am by Steve

Chemistry
the reaction is: 2HNO3 + Ca(OH)2 --> Ca(NO3)2 + 2H2O we know the mole of calcium hydroxide n=cv = 4.2mol/L x 0.025L = _____ this mole needs to be neutralized by the acid. so we need to calculate the mole of nitric acid using the mole ratio from the balanced equation; 2 mole...
Wednesday, June 5, 2013 at 9:47am by bonjo

English
No the question already post it, plz help me ...plz ...plz ...any one... my native language is not english.. plz help me..
Saturday, July 24, 2010 at 10:46pm by shan

CHEM! (SCIENCE) NEED HELP
when you balance it...and it is very easy... Mg+2HCl>>MgCl2 + H2 you see that for each mole of Mg, you get one mole of H2. So for three moles of Mg, you get....
Thursday, January 24, 2013 at 8:15pm by bobpursley

Urgent Chem help.plz
1. 4,8 2.4
Saturday, January 24, 2009 at 3:03pm by Shirley

Urgent Chem help.plz
4,8
Saturday, January 24, 2009 at 3:03pm by amicus

Urgent Chem help.plz
2.=4
Saturday, January 24, 2009 at 3:03pm by amicus

chemistry
given the reactant amounts specified in each chemical eguation, determine the limiting reactant in each case: a. HCL+NaOH->NaCl+H2O 2.0 mole of HCl 2.5 mole NaOH b. Zn+2HCl->ZnCl2+H2 2.5 mole Zn 6.o mole HCl c. 2Fe(OH)3+3H2SO4->Fe2(SO4)3+6H2O 4.0 mole Fe(OH)3 6.5 mole...
Wednesday, March 3, 2010 at 6:43pm by christina

chem
1 mole of C6H12O6=2 moles of C2H5OH moles of C2H5OH*(46.06867g of C2H5OH/mole)=g of C2H5OH (g of C2H5OH/35.1 g of C2H5OH)*100= percent yield of C2H5OH Answer should have three significant figures.
Thursday, March 14, 2013 at 3:40pm by Devron

chem
1.00 mole CaCl2 has 1.00 mole Ca ions and 2.00 moles Cl ions.
Monday, December 12, 2011 at 9:33pm by DrBob222

Chemistry
Determine the simplest formula for compounds that have the following analyses. The data may not be exact. A. 28.5% iron, 48.6% O, 22.9% S This is what I did: 28.5g Fe 1 mole Fe/55.847g = .51 mole 48.6g O 1 mole O/15.999g = 3.04 mole 22.9g S 1 mole S/32.064g = .71 mole (Fe1.0 ...
Wednesday, January 21, 2009 at 6:04pm by Chopsticks

chem
1.60 g SO2 x molar mass of SO2 (1 mole/ 64.06g) = # moles of SO2 x 6.02e23 molecules/ 1 mole SO2 = #molecules of SO2
Thursday, April 19, 2012 at 10:15pm by Glendale, CA

Chemistry
I believe that, if you are calculating M, you must be dealing with Kc but the problem gives you Kp. I think what you need to do is to solve for mole fraction of each gas. mole fraction NO = moles NO/total moles. mole fraction O2 = moles O2/total moles. mole fraction NO2 = mole...
Saturday, October 16, 2010 at 8:23pm by DrBob222

chem
a.)How many moles of NaOH are required to prepare 2.00L od 0.380M solution? answer is 0.760 mole of NaOH (mole/l * 2.00L) b.)What will be the molarity of a solution if 3.50 g of KOH are dissolved in water to make 150.0 mL of solution? answer is 0.52 M KOH (gKOH/molar mass KOH=...
Friday, November 30, 2012 at 12:34am by Angel Locsin

CHEM !(MOLE) PLZ HELP!
1. See the atomic mass for Si from the periodic table. 2. mols = grams/molar mass 3. There are 6.02E23 molecules in a mol. 4. 1 mol is 6.02E23 so 18.06E23 must be ? mols. 5. mols = grams/molar mass. Why would you write this? You should catch on that this is the same problem as...
Thursday, December 6, 2012 at 6:47pm by DrBob222

chem
Yes and no. If 1 mole H2 is added to a mole of 2-butyne, then 2-butene is formed but if TWO moles H2 are added to a mole of 2-butyne, then the product is butane. CH3C(triplebond)CCH3 + H2 ==> CH3CH=CHCH3. The problem is stopping it half-way home. CH3C(triplebond)CCH3 + 2H2...
Thursday, March 12, 2009 at 9:39pm by DrBob222

chemistry
construct the balance reaction equation of Acetic acid and NaOH. take note of the mole ratio calculate the actual mole(n) of NaOH reacting with acetic acid using n=cv use the mole ration to determine the mole of acetic acid from the reacted NaOH mole. calculate the ...
Monday, May 13, 2013 at 8:59am by bonjo

chem
There are 6.02 x 10^23 atoms in a mole of atoms. A mole of Br atoms has a mass of ??. Look it up on the periodic table. It is about 80 I think. Ne is about 20. This information will work both of the problems. Post your work if you get stuck.
Thursday, January 3, 2008 at 10:21pm by DrBob222

Chem -plz check work
You're welcome.
Wednesday, May 28, 2008 at 4:02pm by DrBob222

chem
can you show calculation plz
Thursday, April 23, 2009 at 5:39pm by rit

chemistry.
Your question asks for 0.1 mole. So I would multiply molarity x volume in dm^3 and see which equals 0.1 mole. By the way, the answer choices aren't very clear; for example, 0.1 mole dm^3 is what? Does that mean 0.1 mole/dm^3 or does it have another meaning?
Thursday, November 5, 2009 at 11:52am by DrBob222

Chemistry
I don't know how to start this problem. Someone can help me please. One dm3 of a solution was prepared containing 0.0040 mole of Pb(NO3)2. The Ksp of PbCI2 for the existing conditions is 2.4 x 10^-4. From the list below, choose the smallest numbers of NH4CI that when added to ...
Sunday, May 23, 2010 at 10:35pm by Susie

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 ...
Friday, February 15, 2013 at 2:36pm by Bryce

chem
calculate the change in enthalpy when 1.00g of hydrogen peroxide decomposes. H2O2(l) yields H2O(l)+ 1/2O2(g) (traingle)H- -98.2kj I will be happy to critique your thinking on this. help me? You know the delta H is for one mole decomposition. So figure the fraction of 1gram/one...
Thursday, April 12, 2007 at 10:04am by crystine cole

chemistry - DrBob222
Have you the balanced equation? If you have then step 3 is the easy step. Lets say that the balanced reaction is 2A +3B-> 2C +D this means that 2 moles of A yields 2 moles of C and one mole of D. So if we start with 1 mole of then this will form 1 mole of C and 0.5 mole of ...
Monday, November 15, 2010 at 1:51am by Dr Russ

Chemistry
thanks !:) so then what would this one be ? What are the molar masses of the following compounds from the photosynthesis equation? CO2=___________g=1 mole H20=___________g=1 mole C6H12O6=________g=1 mole O2=________g=1 mole ??
Saturday, February 4, 2012 at 1:30am by Lyssa

Chemistry
Looks like the 1.0 mole of O2 is the limiting reagent. Only 0.5 moles of CH4 can react with it. So, when things are done, you are left with 0.5 mole CH4 (left over) 0.5 mole CO2 1.0 mole H2O
Monday, October 15, 2012 at 3:10am by Steve

mole fraction
If x is the mole fraction pentane, 1-x is the mole fraction of hexane. Assume a mole-fraction-weighted vapor pressure for the mixture. 425x + 151(1-x) = 241 274 x = 90 Solve for x
Saturday, January 30, 2010 at 6:52pm by drwls

CHEM - mole fractions
0.450
Friday, October 8, 2010 at 3:47am by Anonymous

math
the volume of a rectangular solid is given by expressions given below.in each case find the dimentions of the solid. a)15x^2-51x+18. b)x^3+13x^2+32x+20. c)x^2-5x/2-3/2. d)x^4+x^3-x-1 plz everyone help me out.till 2 o'clock...plz plz plz
Wednesday, May 30, 2012 at 4:00am by parul

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