Sunday

April 20, 2014

April 20, 2014

Number of results: 53,036

**Chemistry**

How many atoms are there in 12 grams of Carbon? 12 grams 12.01 moles 6.02x10^23mol x x 1 gram 1 atom = 867.6024 Is this correct?
*Tuesday, June 2, 2009 at 6:52pm by Narasaq*

**Chemistry**

24 grams * (1 ml/12 grams) = 2 ml note I wrote 1 ml/12 g instead of 12 g/1 ml so that the grams cancel If you multiply something by something that is the same top and bottom, for example in this case 12 g and 1 ml, you do not change the amount, only the units. That is an easy ...
*Sunday, February 15, 2009 at 6:33pm by Damon*

**chemistry**

I will assume you mean 24 grams of carbon burned C + O2 --> CO2 C is about 12 grams/mol O2 = 2*16 = 32 grams/mol CO2 = 12+32 = 44 grams/mol therefore 24/2 = 2 mols carbon that means 2 mols O2 and 2 mols CO2 2 mols CO2 = 88 grams --- answer they also gave you redundant ...
*Friday, September 17, 2010 at 4:11pm by Damon*

**CHEMISTRY**

There isn't anything to explain. # mols = grams/molar mass. Plug in grams from the problem (12.6) and molar mass from the problem (84) and divide on your calculator. I get something like 0.15 or so # mols = 12.6/84 = ??. If you prefer to do these by the dimensional method, ...
*Tuesday, July 22, 2008 at 11:26pm by DrBob222*

**math**

13 cents for A 12 cents for B. total protein greater than twelve grams. Total fat less than eight grams. Total grams less than thirty five grams. .5 grams protein and .3 grams fat for A. .6 grams protein and .2 grams fat for B. what is optimal cost
*Tuesday, February 12, 2013 at 8:43pm by Jerome*

**Algebra**

grams 20 % = a grams 60% = b total gold = .2 a + .6 b total mass = a + b = 40 so b = 40-a so .2 a + .6 b = .3 (40) = 12 .2 a + .6 (40-a) = 12 -.4 a + 24 = 12 .4 a = 12 a = 30 so b = 10
*Saturday, June 1, 2013 at 1:36am by Damon*

**science**

what will be the law of conversion of a) 65 grams 70 grams b) magnesium + oxygen = magnesium oxide 45 grams ? grams 80 grams c) sodium hydroxide + hydrochoride acid 40 grams 36.5 grams sodium chloride + water ? grams 18 grams
*Saturday, August 4, 2012 at 12:35pm by Magaly*

**50 what?**

grams? kilograms ? Carats ? If grams (pretty big) 6*10^23 carbon atoms weigh 12 grams so 50 grams * 6*10^23 / 12 = 25*10^23 = 2.5*10^24 atoms
*Saturday, September 8, 2012 at 8:51pm by Damon*

**Chemistry**

First, you made an error before you get to that part. grams O = 2.00-grams C - grams H. You subtracted grams CO2 and grams H2O. Your grams C (and moles) is ok as is the grams H (and moles H) but the oxygen must be redone.
*Monday, October 17, 2011 at 9:21pm by DrBob222*

**chemistry**

Is that 31.45% by mass. If so, then the solution is 12.58 m. 31.45 g HCl(31.45 g HCl + 68.55 g H2O) and 31.45/36.46 = 0.8625 moles HCl in 0.06855 kg solvent which makes the solution 12.58%. Then m x grams soln = m wanted x grams wanted 12.58 m x grams soln = 0.1 m x 500 Solve ...
*Saturday, October 16, 2010 at 11:01am by DrBob222*

**chemistry**

So you follow the equation I gave above and solve for grams stock solution. 12.58 m x grams soln = 0.1 m x 500 grams soln = 0.1 x 500/12.58 = 3.97 g If you know the density you can convert 3.97g to mL. The density of 31% HCl is about 1.16 in my tables. Again, that won't be ...
*Saturday, October 16, 2010 at 11:01am by DrBob222*

**Chemistry**

a chemist wanted to make 100 grams of SO2. She had only 12 grams of sulfur and 4 grams of oxygen. Unfortunately, the amounts of reactants were not enough to make the desired product. How much S and O2 would she need in order to obtain the desired grams of product with no ...
*Thursday, November 3, 2011 at 10:04pm by jermain*

**Chemistry!**

Calculate the solubility of Ag2CrO4 in grams/100mL of water? (Ksp = 1.12x10^-12 ) I know how to calcuate the molar solubility, and I know how to convert it into grams/L...but I'm stuck on how to make it grams/100mL Any Help would be awesome! =D thx!
*Saturday, August 9, 2008 at 11:54am by Sue Ellen*

**CHEMISTRY**

HOW MANY GRAMS OF CA ARE REQUIRED IF I HAVE 12.9 GRAMS OF OXYGEN TO FORM CAO
*Sunday, October 14, 2012 at 6:39pm by TESYANA*

**URGENT Chemistry question**

a chemist wanted to make 100 grams of SO2. She had only 12 grams of sulfur and 4 grams of oxygen. Unfortunately, the amounts of reactants were not enough to make the desired product. How much S and O2 would she need in order to obtain the desired grams of product with no ...
*Thursday, November 3, 2011 at 10:17pm by jermain*

**Math**

3 quarters = $.75 and 18 g 5 nickels = $25 and 25 grams (43 too heavy) 3 quarters = $.75 and 18 g 2 dimes = $.20 and 4 grams 1 nickel =$.05 and 5 grams (27 too light) 2 quarters = $.50 and 12 g 4 dimes = $.40 and 8 grams 2 nickels =$.10 and 10 grams (30g ah hah)
*Thursday, October 16, 2008 at 7:33pm by Damon*

**AP Chemistry**

When a sample of methyl salicylate weighing 5.287 grams is burned in excess oxygen, 12.24 grams of CO2 and 2.522 grams of H2O are formed. What is the empirical formula for oil of wintergreen? I know the answer is C8H8O3, I just need help finding out how to solve the problem. ...
*Tuesday, September 16, 2008 at 7:57pm by R*

**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*

**Organic Chemistry**

A student dehydrated 12 grams of 2-methylcyclohexene with 85% H3PO4, and acquired 6.50 grams of alkene. What are the theoretical and percent yields?
*Monday, April 22, 2013 at 2:32am by Josh *

**Chemistry**

how many moles of H2O are in 12.4g? moles H2O = 12.4/18 grams so to get CuSO4.5H2O, you need (12.4/18)*1/5 moles of CuSO4 figure how many grams that is.
*Tuesday, September 21, 2010 at 8:42pm by bobpursley*

**AP Chemistry**

(a) Convert the grams of CO2 to moles of CO2 by dividing grams of CO2 by the molar mass of CO2. Moles of CO2 = moles of carbon, C. Multiply moles of C by 12.011g/mol to get grams of carbon in the sample. (b) Find the moles of H2O in a similar way. Moles of H = (2)(moles of H2O...
*Tuesday, September 16, 2008 at 7:57pm by GK*

**Chemistry**

1.33 m = 1.33 moles (Et)2O in 1 kg THF. 1.33 moles = 1.33 x 74.12 grams = 98.58 g so the total solution has a mass of 1000 g + 98.58 = 1098.58 grams. You want 471.6 grams (Et)2O which is 471.6/74.12 = 6.363 moles. So you need to take 1098.58 g solution x (6.363 moles/1.33 ...
*Monday, March 1, 2010 at 3:13am by DrBob222*

**Math/Chem**

1 teragram = 1,000,000,000,000 grams = 1012 grams 1 kilogram = 1,000 grams. Can you try to work out the answer?
*Tuesday, August 24, 2010 at 1:39am by MathMate*

**Chemistry.**

I don't know how to answer but I'll give you information and let you choose. 10. A mole of carbon atoms has a mass of 12.011 grams and a mole of He atoms has a mass of 4.002602 grams. In my book, 12.011 is approximately 3 x 4.002602 but it all depends upon how approximate you ...
*Thursday, March 19, 2009 at 8:44pm by DrBob222*

**chemistry**

Mr. Arswan iss preparing a mixture for a science experiment. He measures 10.5 grams of wood shavings, 150 grams of iron filings, and 18.50 grams of salt. What is the total mass of Mr. Arswan`s mixture? A 30.5 grams B 179 grams C 150.5 grams D 17.9 grams
*Sunday, October 6, 2013 at 6:55pm by na*

**Chemistry**

It's too hard to follow all of the divisions etc in line formulas but your problem MAY be you didn't cube the 2.54 cm. The easy way to work the problem is Convert 20 lbs to grams. 20 x 453.59 = ?grams. Then Convert 1 ft to 12" and 12 x 2.54 cm = ?cm 4 x 2.54 cm = ? 12 x 2.54 ...
*Sunday, October 2, 2011 at 12:45am by DrBob222*

**CALCULUS**

The masses of 10 books are found to be in an arithmetic sequence. If their total mass is 13 kg and the lightest book has a mass of 400 grams, what is the mass of the heaviest book? 2,000 grams 2,100 grams 2,200 grams 2,300 grams 2,700 grams
*Tuesday, November 27, 2012 at 11:07am by Chelsy*

**Chemistry**

no. First how many moles are in 12 grams? 12/12.01 round to 1 mole. How many things is in one mole? 6.02*10^23
*Tuesday, June 2, 2009 at 6:52pm by bobpursley*

**science**

Is your son studying density? mass = volume x density. The 12 cm^3 stands for 12 cubic centimeters (a volume), usually written either as 12 cm3 or as 12 cc or 12 c.c. (but the periods USUALLY are not written). Water has a density of approximately 1.0 gram/cc at temperatures ...
*Tuesday, May 12, 2009 at 10:50pm by DrBob222*

**Organic Chemistry**

What's the volume? Is it 12 mL or 112 mL. If 12 mL, then PV = nRT You know P, V, R, and T, solve for n Then n = grams/molar mass and solve for grams. Convert mass to volume using density.
*Monday, October 18, 2010 at 11:52pm by DrBob222*

**Chemistry**

If 12.8 grams of Hydrogen reacts with 18.6 grams of oxygen it produces water. How much water was produced
*Monday, July 19, 2010 at 2:52pm by john*

**Chemistry**

% w/w = (grams HCl/100 g soln)*100 12M is 12 mols/L soln 12 mols = 12*36.5 g/mol = about 438 g HCl mass 1000 mL = 1180 grams (1.18 x 1000) (438/1180)*100 = ? w/w
*Friday, February 15, 2013 at 5:42pm by DrBob222*

**Chemistry**

Elements A and B form two new compounds. In compound I, 2 grams of A is combined with 4 grams of B. In compound II, 4 grams of A is combined with 12 grams of B. If the formula of compound I is A2B, what is the formula of compound II?
*Friday, July 2, 2010 at 9:57pm by Argenta*

**chemistry**

pH = 12 pOH = 14-12 = 2 OH^- = 1 x 10^-2 Therefore, (NaOH) = 1 x 10^-2 M - 0.01 moles/L moles = grams/molar mass. You know moles and molar mass, calculate grams.
*Wednesday, June 2, 2010 at 2:57am by DrBob222*

**Chemistry**

Not a great deal of chemistry here as it is by proportion. He melted 30 grams of Au (gold) with 30 grams of Pb. This melting process resulted to 42 grams of an Au-Pb alloy and some leftover Pb. So assume all the gold is incorporated then (42-30) g of lead used, which is 12 g. ...
*Monday, October 31, 2011 at 8:53am by Dr Russ*

**chem**

phosphorus (12.28g) reacts with excess of oxygen gas to form 21.04 grams of diphosphorus penatoxide. what is the theoretical yile in grams of this reaction? im not sure how exactly do you start this?
*Sunday, December 11, 2011 at 9:48pm by Skye*

**Math**

I need to equal $1.00 and 30 grams With quarter .25=6 grams dime .10=2 grams nickel .05=5 grams
*Thursday, October 16, 2008 at 7:33pm by Corey*

**Math**

Maggie's surprise gift weighs between 8.48 grams and 11.25 grams. Which of these weights could be the weight of the gift? 8.19 Grams 8.75 grams 11.47 grams 11.75 grams ~~~~~~~~~~~~~~~~~~~ How would I show my work on paper for this?
*Monday, April 30, 2012 at 7:30pm by Syd*

**chmistry**

You omitted the units of 3.2? Is that 3.2 grams? If so, read on. If not, the following is not correct. So you have 6 + 1 + 1 total = 8 parts of which 6/8 is KNO3, 1/8 is C and 1/8 is S. 3.2 x (6/8) = 2.4 grams KNO3. 3.2 x (1/8) = 0.4 grams S. 3.2 x (1/8) = 0.4 grams C. Now ...
*Tuesday, October 27, 2009 at 12:46am by DrBob222*

**Probabability**

You are in charge of quality control on a line which fills bottles of soda. The desired gross weight for a 2 liter bottle of soda is 2,160 grams. At the end of each shift you select 12 bottles at random and weigh them. After one month, the overall average weight of all bottles...
*Thursday, March 4, 2010 at 8:53am by Jon*

**Chemistry Conversions**

no, not exactly Mass=Moles*molmass =.000523moles* (12*6 +1*12+16*6)grams/mole
*Tuesday, January 27, 2009 at 5:12pm by bobpursley*

**adult education**

A Chemist weighed three separate test at 0.17 gram, 0.204 gram, and 2.3 grams. What is total weight of the three samples? A. 2.44 grams B. 2.521 grams C. 2.674 grams D. 3.97 grams
*Saturday, February 20, 2010 at 7:36pm by sabrina*

**Chemistry**

2) YOur balanced equation gives the answer: 1 mole of calcium carbonate yields one mole of carbon dioxide, which is 12 grams carbon. So for .55grams, you must have had .55/12 moles of calcium carbonate. 3. knowing the moles of calcium carbonate, change it to mass (grams).
*Wednesday, February 17, 2010 at 1:04am by bobpursley*

**chemistry**

i need to know if I am in the right tract please let me know...I am calulating the molality of the following exercise so I could be able to apply the formula T=Kf * molality calculate the freezing point of a solution containin 12.2 grams of benzoic acid, dissolved in 250 grams...
*Monday, October 27, 2008 at 4:20pm by Joshua*

**Chemistry**

Could someone please tell me if I did this question right? An incomplete reaction of 12.125 grams of propane proceeds as follows. 2C3H8+11O2 --> 3CO2+4H2O+2CO+C(s) How many grams of solid carbon residue are produced as a product? My answer: Step 1) Balanced the given ...
*Saturday, October 17, 2009 at 8:05pm by Adam*

**science**

calculate what? assume you have 100 grams. then 80 grams is carbon, or 80/12 moles and 20 grams is H, or 20/1 moles H C=80/12=6.66 moles H= 20 divide each by the lowest C=1 H=3 empirical formula: CH3 Now, 22.4 liters has a mass of 1.35*22.4 = 30.24grams divide that by the ...
*Thursday, December 1, 2011 at 7:12am by bobpursley*

**science**

CH4 = 12+4 = 16 grams / mole He = 4 grams/mole O2 = 16*2 = 32 grams/mole N2 = 14*2 = 28 grams/mole By the way H2O = 2+16 18 grams/mole so water vapor is lighter than air which is about 80% N2 and 20% O2 (steam rises :) A water vapor molecule is also much smaller than an ...
*Wednesday, November 10, 2010 at 2:43pm by Damon*

**Biochemistry**

mg/1000 = grams. grams/100 x 10 converts to grams/L. grams/molar mass converts grams to moles. Now you have moles/L.
*Tuesday, September 1, 2009 at 9:08pm by DrBob222*

**Chem**

You're absolutely right. 12.5 g ethylene glycol in 100 g H2O is 12.5 g solute in (12.5g + 100 g) = 112.5 solution. Then use density to convert grams solution to L soln.
*Friday, February 15, 2013 at 4:12pm by DrBob222*

**chemistry **

Could someone please tell me if I did this question correctly? An incomplete combustion reaction of 12.125 grams of propane proceeds as follows: 2C3H8 + 11O2 = 3CO2 + 4H2O + 2CO + C(s).How many grams of solid carbon residue are produced as a product? my answer: known: molar ...
*Tuesday, October 13, 2009 at 8:55pm by Will*

**chem**

when hydrocarbons are burned in a limited amount of air CO as well as CO2 form. When 0.450 grams of a particular hydrocarbon was burned in air, 0.467 grams of CO, 0.733 grams of CO2, and 0.450 grams of H20 were formed. a. What is the empirical formula? I got C2H3! check? b. ...
*Friday, August 17, 2012 at 1:19pm by skye*

**Chemistry**

A student makes a solution by dissolving 55.8 grams of potassium hydroxide in 875.0 grams of water. The resulting solution has a density of 1.07 grams per milliliter. 1. What is the volume of this solution? 2. Calculate the % concentration of this solution. 3. Calculate the ...
*Monday, January 31, 2011 at 1:02pm by Paul*

**Chemistry**

It's true that, although we usually talk about molar mass in grams, we CAN make it mg, or kg, or tons (or any other unit) and adjust our other numbers. For example, try a problem with, "How many grams of O2 are formed from the decomposition of 12.25 g KClO3 by 2KClO3 ==> ...
*Tuesday, January 6, 2009 at 9:25pm by DrBob222*

**Chemistry**

A student makes a solution by dissolving 55.8 grams of potassium hydroxide in 875.0 grams of water. The resulting solution has a density of 1.07 grams per milliliter. 1. What is the volume of this solution? 2. Calculate the % concentration of this solution. 3. Calculate the ...
*Monday, January 31, 2011 at 9:59pm by Paul*

**Chemistry**

A student makes a solution by dissolving 55.8 grams of potassium hydroxide in 875.0 grams of water. The resulting solution has a density of 1.07 grams per milliliter. 1. What is the volume of this solution? 2. Calculate the % concentration of this solution. 3. Calculate the ...
*Tuesday, February 1, 2011 at 4:42am by Paul*

**Chemistry**

A student makes a solution by dissolving 55.8 grams of potassium hydroxide in 875.0 grams of water. The resulting solution has a density of 1.07 grams per milliliter. 1. What is the volume of this solution? 2. Calculate the % concentration of this solution. 3. Calculate the ...
*Tuesday, February 1, 2011 at 10:53am by Paul*

**Chemistry**

I have always tried to impress upon students that reactions are between molecules (particles) an when 6.02 x 10^23 particles are put together we have a mole. Reactions are between moles and not grams. Grams, of course, get into the equations because moles = g/molar mass but ...
*Thursday, March 4, 2010 at 11:50pm by DrBob222*

**Chemistry**

Consider: C6H12)6 + 6O2-> 6CO2 + 6H2O + Energy a)If I have 90 grams glucose and all is consumed by oxygen, then how many grams of water will be produced? b)How many grams of oxygen will be consumed? c)How many grams of sugar will be burned off if 85 grams of O2 is consumed?
*Saturday, January 22, 2011 at 5:59pm by Lindsey*

**Physics**

The masses of 1 mole of various gases are as follows: hydrogen about 2 grams, helium about 4 grams, nitrogen about 28 grams, oxygen about 32 grams and carbon dioxide about 44 grams. On the average how fast does a molecule of each gas move at 333 Celsius?
*Tuesday, April 6, 2010 at 2:10pm by Benny*

**physics**

The masses of 1 mole of various gases are as follows: hydrogen about 2 grams, helium about 4 grams, nitrogen about 28 grams, oxygen about 32 grams and carbon dioxide about 44 grams. On the average how fast does a molecule of each gas move at 333 Celsius?
*Tuesday, April 6, 2010 at 11:22pm by Plaster*

**9th grade**

A student put 12.4 grams of potassium sulfate in 29 ml and stirred for 3 hrs. he saw that not all of the solid dissolved, so he removed the extra solid and found it had a mass of 3.4 grams. what was the solubility of the chemical?
*Sunday, February 21, 2010 at 4:44pm by Anonymous*

**chemistry**

Ignore the 24 mL and 2.50 M. What you have is what you originally put in. That is 5.00mL x 12.0 M (you didn't put units but I'm guessing M). So mols = M x L and grams = mols x molar mass or about 2.4 grams of NaOH.
*Tuesday, April 24, 2012 at 12:36pm by DrBob222*

**Statistics**

The USDA size standards for eggs are based on weight and are as follows: SMALL: greater than 43 grams, less than 50 grams MEDIUM: greater than 50 grams, less than 57 grams LARGE: greater than 57 grams, less than 64 grams EXTRA LARGE: greater than 64 grams, less than 71 grams ...
*Thursday, March 4, 2010 at 9:00am by Ion*

**Chemistry**

You quit writing too soon and the problem isn't clear. The ratio is C/H = 12/1 atom to atom in grams. C/H2 = 12/2 atom to molecule (grams). When one writes ...... mass of 1 mole of carbon to one mole of hydrogen, I think of hydrogen as being H2. Finally, I could have ...
*Tuesday, January 25, 2011 at 8:05pm by DrBob222*

**chemistry**

Calculate the solubility (in grams per 100 mL of solution) of magnesium hydroxide in a solution buffered at pH = 12. I can get the answer in grams per mole, but i am having difficulty changing it to g/100ml.
*Monday, November 1, 2010 at 1:52am by moe*

**math**

a = mass of one aple b = mass of basket 1 basket : 12 a + b = 3105 Subtract 12 a to both sides 12 a + b - 12 b = 3105 - 12 a b = 3105 - 12 a 2 basket : 7 a + b = 1980 7 a + 3105 - 12 a = 1980 - 5 a + 3105 = 1980 Subtract 3105 to both sides - 5 a + 3105 - 3105 = 1980 - 3105 - 5...
*Thursday, October 4, 2012 at 8:43pm by Bosnian*

**thermal physics**

Let the unknown mass of steam required by X grams. The amount of heat that is loses changing to 12 C liquid water equals the heat gained by the 340g of ice as it melts to form water at the same temperature (12 C). If we use units of J/g and J/g K, X*[2256 + 4.186(100 - 12)] = ...
*Wednesday, March 25, 2009 at 7:15am by drwls*

**earth science**

what would be the chart to use for carbon 14 whcih has a half life of 5730 years and a piece of wood which originally has 12 grams pf radioactive isotope; If the half lives occurred and now has 0.75 grams left?
*Thursday, November 29, 2012 at 3:46pm by lan*

**Statistics**

Please help, need advise. Thanks A The amount of pyridoxine (in grams) in a multiple vitamin is normally distributed with = 110 grams and = 25 grams. What is the probability that a randomly selected vitamin will contain less than 100 grams of pyridoxine? ì ó B The amount of ...
*Wednesday, July 23, 2008 at 8:17pm by Fiza*

**Chemistry**

If a sample of Co2(CO)8 is found to contain 6*10^-2 mol of C atoms, how many grams of Co atoms are present? Molar Mass (g/mol) Co2(CO)8 - 341.95 Co atom - 58.933 C atom - 12.011 O atom - 15.999 Avaogadro's No.: 6.022*10^23 Do I need to use the 6*10^-2 mol of C atoms to find ...
*Monday, January 16, 2012 at 11:56am by Kyle*

**chemistry**

Ibuprofen, the active ingredient in Advil, is made up of carbon, hydrogen, and oxygen atoms. When a sample of ibuprofen, weighing 5.000 g, burns in oxygen, 13.86g of CO2 and 3.926 g of water are obtained. What is the simplest formula of ibuprofen? I need to find out if I'm ...
*Saturday, October 4, 2008 at 1:14pm by robert*

**chemistry **

Let X = mass ZnS Let Y = mass PbS MM = molar mass ===================== You need two equations. X + Y = 6.12 is one. The second is X(MM H2S/MM ZnS) + Y(MMH2S/MMPbS) = grams H2S. The g H2S must be calculated from PV = nRT and solve for n=number of moles H2S, then convert to ...
*Sunday, October 24, 2010 at 8:39pm by DrBob222*

**chemistry**

[(12 + (3x1) + 12 + (2x16) + 1)]/6.02*10^23 = ? grams Add up the atomic mass numbers of all atoms in the molecule. Then divide by Avogadro's number
*Friday, February 1, 2008 at 7:07pm by drwls*

**Chemistry- Drbob-help**

I have placed the answer I got please help. A student makes a solution by dissolving 55.8 grams of potassium hydroxide in 875.0 grams of water. The resulting solution has a density of 1.07 grams per milliliter. 1. What is the volume of this solution? 870mL 2. Calculate the % ...
*Wednesday, February 9, 2011 at 11:31pm by Paul*

**Stoichiometry Test**

Does it say percentage by mass or percentage of atoms or what? I will assume percentage of mass. Now O atoms have a mass of about 16 grams per about 6*10^23 of them (Avagadro's number, sort of like 12 is a dozen, 6*10^23 is a mole) So in a mole of this stuff we have 32 grams ...
*Thursday, February 12, 2009 at 4:26pm by Damon*

**chemistry**

ml x N = number of milliequivalents 80 KOH added initially. The KOH reacted with the NH3 produced from the reaction of NH4Cl with the KOH). After the reaction the excess KOH was titrated with 12.5 mL of 0.75 N acid. 12.5 x 0.75 N = 9.375 milliequivalents acid needed to ...
*Sunday, February 10, 2013 at 6:43pm by DrBob222*

**Chemistry**

I have a problem that has been driving me crazy trying to solve, and I was wondering if someone could help. The problem is this: "Given the reaction: CuSO4 + 4 NH3 ----> Cu(NH3)4SO4, if 10 grams of CuSO4 reacts with 30 grams of NH3, what is the theoretical yield of Cu(NH3)...
*Thursday, August 23, 2007 at 1:10pm by Josh*

**Chemistry**

You need to find the arrow button and use it with equations. --> or ==> or >>>. I think the first thing to do is to convert 12% v/v to grams ethanol. That is 12 mL ethanol/100 mL soln. Scale that up to 712 (I guess we assume ALL of the grape juice is glucose ...
*Tuesday, November 13, 2012 at 7:56pm by DrBob222*

**chemistry**

I think maybe you better look up the solubility which is normally in grams or mols per liter but 36 grams in 100 grams is much higher than believable by any stretch of the imagination. A liter of fresh water is about a 1000 grams.
*Saturday, March 8, 2014 at 2:03pm by Damon*

**stoichiometry**

In the cocaine formula for every N (14 g/mole) atom here are 17 C (12g) atoms and 2 H (1g) atoms Therefore thee ratios of masses of those three elements must be: N -- 14 C --17*12 = 204 H --2*1 =2 Now how many moles of C in 150 g CO2? (I am going to use grams instead of ...
*Saturday, October 4, 2008 at 11:00am by Damon*

**Chemistry**

1. What is the percent by mass of a solution that contains 50 grams of solute dissolved in 200 grams of solution? What is the concentration of the same solution in parts per million? 2. What is the percent mass of a solution that contains 75 grams of salt dissolved in 150 ...
*Friday, March 25, 2011 at 11:03am by Leora *

**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**

1.30 grams of chromium reacts with 9.5 grams of iodine. What is the percent of chromium in this compound? How do I work out this answer. I know answer is 12.02, but can figure out how to get it! Thanks!
*Saturday, March 26, 2011 at 12:28pm by Quick chem question*

**chemistry**

I worked 1 and 2 for you a couple of days ago. g H(atoms that is) = 12.0-gO - gC = ? %H = (g H/12.O)*100 = ? 20.2% Al 100-20.2 = %Cl Take a 100 g sample which will give you 20.2g Al 79.8 g Cl Convert grams t mols. mol = grams/molar mass. Then find the ratio of Al and Cl to ...
*Tuesday, March 13, 2012 at 6:39pm by DrBob222*

**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*

**Ochem**

I would try setting it up as a proportion. The percentage just means that there are 6.65 grams of NaOCl per 100 grams. Therefore, set up the problem of (6.65/100)=(x/12.14)
*Wednesday, February 1, 2012 at 3:46am by Shannon*

**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*

**chem**

I have no idea what experiment 4 is nor what role the benzoic acid played in the experiment. However, g benzoic acid in the 20.5 mL is M x L x molar mass = grams. 5.256M x 0.0205 L x 122.12 = ?grams.
*Monday, February 4, 2013 at 12:41am by DrBob222*

**Chemistry**

grams CH3CH2CH2OH = volume x density = 12.8 x 0.803 = ? moles CH3CH2CH2OH = grams/molar mass Then M = moles/L soln. L soln = 0.075L
*Saturday, October 1, 2011 at 7:32pm by DrBob222*

**Chemistry**

2 Fe (s) + 6 HCl (aq) -> 2 FeCL3 (s) + 3 H2 (g) 12.2 grams of Fe reacts with excess of HCl. how many grams of FeCl3 will be produced?
*Thursday, May 24, 2012 at 6:47pm by Lily*

**chemistry**

Neither. The molar mass = 180. moles in 12.0 grams is 12.0/180 = 0.06667 and I would keep it like that until the end, then round the final answer.
*Wednesday, February 10, 2010 at 11:50pm by DrBob222*

**investments**

Assume the following daily closing for the Dow Jones Industrial Average: Day DJIA Day DJIA 1 12,010 7 12,220 2 12,100 8 12,130 3 12,165 9 12,250 4 12,080 10 12,315 5 12,070 11 12,240 6 12,150 12 12,310 a.
*Wednesday, July 11, 2007 at 9:11pm by lia82*

**chemistry**

12% MgCl2 means 12 g MgCl2 in 100 g solution. Use the density to calculate the volume of 1000 mL. 1.105 g/mL x 1000 mL = 1105 grams. 1105 x 0.12 = 132.6 g MgCl2 and 1105-132.6 = ?? g H2O moles H2O = grams/molar mass H2O moles MgCl2 = g MgCl2/molar mass MgCl2. XH2O = moles H2O/...
*Saturday, June 26, 2010 at 9:54pm by DrBob222*

**stat**

1. The amount of pyridoxine (in grams) per multiple vitamin is normally distributed with = 110 grams and = 25 grams. A sample of 25 vitamins is to be selected. So, 95% of all sample means will be greater than how many grams?
*Wednesday, December 1, 2010 at 7:11pm by Anonymous*

**math**

The weights of adult long-tongued fruit bats are known to be normally distributed with a mean of 20.22 grams and a standard deviation of 3.23 grams. What is the probability that a randomly selected bat will: a) weigh at most 15 grams? b) weigh less than 30 grams?
*Wednesday, March 21, 2012 at 7:57pm by becky*

**Math**

The weights of adult long-tongued fruit bats are known to be normally distributed with a mean of 20.22 grams and a standard deviation of 3.23 grams. What is the probability that a randomly selected bat will: a) weigh at most 15 grams? b) weigh less than 30 grams?
*Friday, March 23, 2012 at 2:15am by Becky*

**chemistry**

Here is what I posted previously. Convert 12 ounces to grams. (mass ice x 330 J/g) + [(mass water x specific heat water x (Tfinal-Tinitial)] = 0 Solve for mass ice. Show your work and I'll try to find the error. Mass ice is the only unknown. mass water is 12 ounces; you need ...
*Wednesday, September 15, 2010 at 7:25pm by DrBob222*

**chem**

Convert 4.88 g CO2 to grams C. Convert 1.83 g H2O to grams hydrogen (H, not H2).Your answer looks ok for this part. Then 1.83 - g C - g H = g O (not O2) Then g C/12 = mols C g H/1 = mols H g O/16 = mols O Then find the ratio.
*Sunday, August 19, 2012 at 1:14pm by DrBob222*

**Chemistry- Empirical Formula**

Yes and no. Yes, you can convert 6.63 mg to grams, go through the calculation and convert grams back to mg but I didn't convert in the first place so I had no reconverting to do. Another way is to convert 6.63 mg to grams, go through the calculation and have the answer for H ...
*Monday, April 19, 2010 at 9:36pm by DrBob222*

**Chemistry**

Aha!. I wondered how you did it. But you KNOW 1 atom of oxygen can't possibly weigh that much. You can't even see 1 atom of oxygen so you know the mass of 1 atom must be very small. And your number isn't very small; it is very large. The mass of 1 mol is 32 grams. I told you ...
*Saturday, November 3, 2007 at 4:17pm by DrBob222*

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