Number of results: 107,557
Poor question. What is the FINAL volume. If you assume 20 g sugar in 20 mL solution (which it will not be) or 15 g sugar in 15 mL solution (which it will not be) then convert 20 g sugar to mols.mols = grams/molar mass and M = mols/L soln. Convert 15 g sugar the same way and M...
Thursday, June 20, 2013 at 8:49am by DrBob222
Sugar solution is composed of 40 grams of sugar and 200 grams of water. How many grams of sugar must be added to make a 60% sugar solution? (Kindly write the equation..... tnx)
Thursday, November 22, 2012 at 1:16am by HELP HELP MNHS
mols glucose = grams/molar mass mols O atom = mols glucose x 6 (from formula of C6H12O6) 1 mol contains 6.02E23 atoms; therefore 6 mols will contain ......?
Monday, May 14, 2012 at 4:57am by DrBob222
You can get at the grams another way without knowing the concn of H2SO4. You need to know concn IF we wanted to know the volume of H2SO4 needed; however, we only need to know grams. That is done as follows: 2NaOH + H2SO4 ==> Na2SO4 + 2H2O mols NaOH = M x L = ? Use the ...
Thursday, October 18, 2012 at 5:32am by DrBob222
How many grams of C6H12O6 need to be dissolved in 350g of water vto have a solution which freezes at -2.50 degrees celcius? delta T = Kf*m You know Kf, m = molality = mols/kg and mols = grams/molar mass, delta T is 2.50. Solve for grams. Post your work if you get stuck. what ...
Thursday, May 31, 2007 at 9:15pm by jessica
For molarity, remember the definition. Molarity - # mols/L # mols = grams/molar mass. equation 1. M=mols/L 6M = mols/0.025 L mols = 6M x 0.025 L = ?? That is the # mols you need. equation 2. mols = g/molar mass ?? from above = g/molar mass. Plug in molar mass NaOH and solve ...
Saturday, January 19, 2008 at 10:45pm by DrBob222
molar mass C6H12O6 is ok. The first error is to convert grams to mols you DIVIDE. mols = grams/molar mass. The remainder of the procedure looks ok at first glance. Let me know if you don't get the right answer.
Monday, January 5, 2009 at 7:16pm by DrBob222
mols sugar = grams/molar mass m = mols/kg solvent
Monday, April 15, 2013 at 11:42am by DrBob222
mass-mass conversions and mass-mole conversions: what is the difference and how do you do each? mass is converted to mols by mols = grams/molar mass. mass of one chemical is converted to mass of another chemical by using the coefficients in the balanced chemical equation. For ...
Thursday, January 18, 2007 at 10:47pm by Briana
mols acid = mols base mols base = M x L = ? Then mols acid = grams acid/molar mass. You know mols acid and grams, solve for molar mass. Solve for mols base at 21.0 mL Solve for mols acid remaining at 21.0 mL base Substitute into H-H equation (see your post above) and solve for...
Friday, June 14, 2013 at 9:19pm by DrBob222
What preperation produces a 2.0 Mole solution of C6H12O6? a) 90.0 grams of C6H12O6 dissolved in 500.0 mL of solution b) 180.0 grams of C6H12O6 dissolved in 1000mL of solution c) 90 Grams of C6H12O6 dissolved in 1000mL of solution D) 180.0 Grams of C6H12O6 dissolved in 500.0mL ...
Wednesday, December 19, 2012 at 11:23pm by D
M = mols/L and rearrange to mols = MxL and mols = grams/molar mass Therefore, since mols = mols we can set those equal to each other to obtain mols = M x L = mols = grams/molar mass and L x M x molar mass = grams. Plug in the numbers and solve for grams.
Tuesday, April 29, 2008 at 6:59pm by DrBob222
Why is CO^2 required by plants to produce glucose? ( the arrow pointing up should be pointed down.) CO2 is where the Carbon comes from to make sugar.Glucose is a six-carbon sugar represented by the formula C6H12O6
Thursday, January 4, 2007 at 9:19pm by marco
How many mols HCl do you have? M x L = mols. Write the equation. How many mols NaOH do you need? mols NaOH = grams/molar mass. Solve for grams.
Friday, May 11, 2012 at 12:04am by DrBob222
how many grams of glucose C6H12O6 would you need to make 250 mL of 1.0 M solution?
Thursday, April 28, 2011 at 4:36pm by amber
molality = mols EtOH/kg solvent Convert mols EtOH to grams. g = mols x molar mass. Add g EtOH to 1000 for mass solution. Then mass % = (grams EtOH/total grams)*100 = ? By the way, I wonder how you obtained -21.7m. A negative number for concentration? I don't think so.
Monday, January 14, 2013 at 2:51pm by DrBob222
Write and balance the equation. C6H12O6 + 6O2 ==> 6CO2 + 6H2O mols glucose = grams/molar mass = ? Using the coefficients in the balanced equation, convert mols glucose to mols O2. Now convert mols O2 to volume (L) using PV = nRT and the conditions listed.
Wednesday, October 31, 2012 at 1:12pm by DrBob222
How many grams of glucose C6H12O6 would you need to make 250 mL of 1.0M solution?
Wednesday, May 29, 2013 at 1:50am by kevin
21.9999/0.513 = total grams mixture grams mixture x (1.00-0.487) = g CaS grams CaS/molar mass CaS = mols CaS mols S = mols CaS.
Wednesday, April 4, 2012 at 12:59am by DrBob222
H2Ox + 2NaOH ==> Na2Ox + 2H2O mols Ox = grams/molar mass mols NaOH required = 2 x mols Ox (from th equation). M NaOH = mols NaOH/L NaOH/ Then to prepare 2.5L of solution you will need how many mols total? That is M x L = ? grams NaOH = mols NaOH/molar mass NaOH. You know ...
Wednesday, May 9, 2012 at 9:42am by DrBob222
I think you mean Al reacts with sulfuric acid..... Write the equation and balance it. Convert 250 g H2SO4 to mols. mols = grams/molar mass. Using the coefficients in the balanced equuation, convert mols H2SO4 to mols Al2(SO4)3. Finally, ocnvert mols Al2(SO4)3 to grams. grams...
Sunday, December 9, 2007 at 5:44pm by DrBob222
molarity = mols/L and mols = g/molar mass; therefore, grams = mols*molar mass. The answer for the solubility copmes out in units of molarity and that is mols/L. Therefore, all you need to do is to convert mols to grams and that will be g/L since M is mols/L.
Saturday, January 24, 2009 at 1:15pm by DrBob222
How many mols do you need? That's mols = M x L = ? Then mols = grams/molar mass. Solve for grams.
Tuesday, September 10, 2013 at 8:22pm by DrBob222
Chemistry 1 H
AgNO3+ BaCl2-> AgCl+ Ba(NO3)2 a. balence the equasion b. How many grams of silver chloride(AgCl) are produced from 5.0g of silver nitrate (AgNO3) reacting with an excess of barium chloride(Ba Cl2)? c. How Many grams of barium chloride (BaCl2) is necessary to react with 5.0...
Thursday, January 4, 2007 at 5:57pm by Lexi
When TWO reactants are given, you know it is a limiting reagent problem. Here is how you do these. 1. Convert what you are given to mols. a. 28.8 g Mg to mols Mg. # mols = grams/atomic mass Mg. b. 21 g N2 to mols N2. # mols = grams/atomic mass N2. 2. Using the coefficients in ...
Thursday, July 24, 2008 at 6:34pm by DrBob222
I didn't check it but make sure the equation is balanced. Convert 2.000 g of the ferrous ammonium sulfate (the starting reactant) to mols remembering that mols = grams/molar mass. Convert mols ferrous ammonium sulfate to mols of the product using the coefficients in the ...
Tuesday, April 15, 2008 at 4:14pm by DrBob222
You probably intended this to be potassium hydrogen phthalate which I will rewrite, to make things simpler, as KHP. The H is the hydrogen neutralized by the NaOH. NaOH + KHP ==> NaKP + H2O. mols KHP = 1.029 grams/molar mass KHP. mols NaOH = mols KHP. mols NaOH = L x M. You ...
Thursday, November 1, 2007 at 9:20pm by DrBob222
C12H22O11(s) + 12O2(g)==> 12CO2(g) + 11H2O(g) You know this is another limiting reagent (LR) problem because amounts are given for BOTH reactants. mols sugar = grams/molar mass = ? mols O2 = grams/molar mass = ? Using the coefficients in the balanced equation, convert mols ...
Wednesday, October 9, 2013 at 2:07pm by DrBob222
How many mols do you need? That's M x L = 0.5M x 0.25L = 0.125 mols. Convert mols to grams. g = mols x molar mass.
Monday, August 6, 2012 at 10:56am by DrBob222
mols C12H22O11 = grams/molar mass m = mols/kg You have mols C12H22O11. Convert 2000 g H2O to mols and find total mols. Then XC12H22O11 = mols C12H22O11/total mols. %w/w = [(grams C12H11O11/(2000g H2O + grams C12H22O11)]*(100 = ?
Thursday, June 20, 2013 at 9:39pm by DrBob222
How many moles do you want? That's M x L = mols. How many grams is that? That's mols = grams/molar mass. Calculate grams. Weigh the grams, add to the 200 mL volumetric flask, add some water, swish to dissolve the solid, make to the mark with distilled water and mix thoroughly.
Saturday, February 15, 2014 at 3:59pm by DrBob222
How many mols do you need? That's M x L = ? Then convert that to grams. mols = grams/molar mass. You can calculate molar mass and you know mols from above, solve for grams.
Saturday, February 22, 2014 at 2:46pm by DrBob222
Note that the aspirin reaction is 1:1:1:1. 1. You want to prepare 45.0 g aspirin but since the yield is only 85.0%, you must try to prepare 45.0/0.85 = about 53 g. I rounded here and there so you need to do it exactly. 2. Convert 53 g aspirin to mols. # mols = grams/molar mass...
Monday, September 22, 2008 at 11:06pm by DrBob222
Pre AP Chemistry
If I have a 1200 gram sample of a soft drink and it contains 180 grams of sugar, the percentage by mass of the sugar in the drink is 15%. If the sugar in the drink is sucrose (C12H22O11), how many grams of pure carbon can be obtained from decomposing all of the sugar in the ...
Tuesday, February 22, 2011 at 12:14pm by Lynn
how much sugar is dissolved in 500 grams of a solution if the solution is 70 percent sugar by mass? Also, What is the concentration of a solution that contains 45 grams of sugar in 500 grams of solution? thank you
Sunday, December 28, 2008 at 3:55pm by Lisa
If you know the equation, this becomes a general chemistry stoichiometry problem. 1. Write the equation. You need only mols of ketone to mols borohydride. 2. Convert 153 mg of the ketone to mols. mols = grams/molar mass 3. Convert mols ketone to mols of the borohydride using ...
Saturday, August 18, 2012 at 6:04pm by DrBob222
how many grams of zinc are required to react with excess acid to make one liter of hydrogen at STP? i have no clue how to go about this i need help Write the balanced equation. Zn + 2HCl ==> ZnCl2 + H2 2. Use PV = nRT to convert 1 L H2 gas to mols OR take the shortcut ...
Monday, April 23, 2007 at 10:48pm by yellowone
a). mols HCl = mols Al x (24 mols HCl/4 mols Al) = mols Al x (24/4) = ? B). Convert grams (NH4)2CrO4 to mols. mols = grams/molar mass Using the coefficients in the balanced equation (as I did above in part a)convert mols mols (NH4)2CrO4 to mols Al. Now convert mols Al to grams...
Monday, August 26, 2013 at 12:04am by DrBob222
I need help on this stoichiometry problem. I don't know whay my answer is incorrect. The fermentation of sugar to produce ethyl alcohol occurs by the following reaction: C6H12O6 -- 2C2H5OH + 2CO2 What mass of ethyl alcohol can be made from 1.00 kg of sugar? I keep getting 1012...
Tuesday, September 28, 2010 at 6:20pm by Deni
First you have to get from grams of FeCl3 to moles by dividing the grams by the molar mass of FeCl3, 162.21. 7.83 / 162.21 = .0483 mols Second, you have to convert from moles of FeCl3 to moles of Fe. With this compound, for every mole of FeCl3 there is one mole of Fe. .0483 ...
Friday, October 9, 2009 at 4:33pm by John
Convert 2.0 metric tons Al2O3 to grams Al2O3. Convert grams Al2O3 to mols Al2O3. Convert mols Al2O3 to mols Al knowing that there are 2 mols Al for every mol Al2O3. Convert mols Al to grams Al remembering that mols x atomic mass = grams. Finally, convert grams Al to kg Al. ...
Sunday, January 13, 2008 at 10:16pm by DrBob222
mols = grams/molar mass. Use the coefficients in the balanced equation to convert mols of one material to mols of the other. For example, 2H2 + O2 ==> 2H2O. You have 5 mols H2 and you want to convert to mols of H2O produced. So the conversion is as follows: mols H2O = 5 ...
Sunday, June 1, 2008 at 9:42pm by DrBob222
If Na^+ = 1.5M then Na3PO4 will be 1/3 that or 0.05M Then how many mols do I need? That's M x L = 0.05 x 0.650 L = ? Finally, mols = grams/molar mass. You know molar mass and mols, solve for grams.
Wednesday, September 25, 2013 at 10:34pm by DrBob222
How many mols do you need? That's M x L = ? Then mols = grams/molar mass. Solve for grams.
Monday, October 1, 2012 at 12:46pm by DrBob222
How many mols do you need? That's M x L = mols. Then mols = grams/molar mass. You knopw mols and molar mass, solve for grams.
Monday, May 28, 2012 at 7:32pm by DrBob222
You need to write and balance the equation. 2NO + 2H2 ==> N2 + 2H2O Convert 22.2 g H2 to mols. mols = grams/molar mass. Use the coefficients in the balanced equation to convert mols H2 to mols N2. Now convert mols N2 gas to grams. g = mols x molar mass.
Tuesday, October 16, 2012 at 10:30am by DrBob222
how many moles of sugar are contained in a 10-lb bag of sugar if sugar has formula C12H22O11? first convert the pounds into grams, then grams into moles.
Saturday, December 1, 2012 at 12:22am by Deidra
C12H22O11 + 12O2 ==> 12CO2 + 11H2O So convert 3.10g CO2 to mols C12H22O11. mols CO2 = 3.10/44 = about 0.07 but you should do it more accurately. 0.07 x (1 mol C12H22O11/12 mol CO2) = about 0.006 (again, an estimate). Then mols C12H22O11 x molar mass = about 2.0 grams. sugar...
Saturday, September 28, 2013 at 8:55pm by DrBob222
mols = grams/molasr mass = about 0.08 mols, then 0.08/0.075 = about 1.13. You need to do this more accurately. mols = M x L = 0.06 x 2L = ? M = mols/L. You know mols and M, solve for L and convert to mL.
Wednesday, March 13, 2013 at 4:32pm by DrBob222
C12H22O11 + 12O2 ==> 12CO2 + 11H2O Convert 2.50 g CO2 to moles grams sugar. The easy way is 2.50g CO2 x (molar mass sugar/12*molar mass CO2) = about 1.7 g (but you need to be more accurate). Then 5.00g - 1.7g sugar = grams NaCl. %NaCl = (mass NaCl/mass sample)*100 = ??
Monday, October 24, 2011 at 5:28pm by DrBob222
if C6H12O6 -> 2 C2H5OH + 2 CO2 represents the fermentation of sugar to produce alcohol, and the reaction is only 40.0% efficient (% yield), what is the actual yield of alcohol from 454 g of C6H12O6
Tuesday, November 30, 2010 at 4:11pm by lianne
2Mg + O2 ==> 2MgO Convert 18.66 g Mg to mols. Convert mols Mg to mols oxygen (which is mols oxygen USED). Convert mols oxygen to grams and subtract initial mols - mols used = mols remaining. Post your work if you need more help.
Tuesday, November 20, 2007 at 7:02pm by DrBob222
M = mols/L. You get mols by grams/molar mass. Now that you have mols, you can calculate m. m = mols/kg solvent. for X. You have mols glucose. Find mols H2O = grams/molar mass Then total mols = mols glucose+mols H2O Xglucose = mols glucose/total mols. Post your work if you get ...
Monday, October 7, 2013 at 3:52pm by DrBob222
A solution is made by dissolving 21.5 grams of glucose (C6H12O6) in 255 grams of water. What is the freezing-point depression of the solvent if the freezing point constant is -1.86 °C/m?
Sunday, September 25, 2011 at 6:17pm by ryan
Help now please, Chemistry
How many grams of oxygen can be produced by heating 10.0g of mercury (II) oxide? Sulfuric acid is added to 8.10g of magnesium, how many grams of hydrogen are set free? I'll do the first. You do the second by following the first as a guide. 1. Write the balanced equation. 2HgO...
Monday, March 5, 2007 at 5:31pm by Beautiful
How many mols do you need? That is M x L = ? Then mols = grams/molar mass. You know mols and molar mass, solve for grams. Calcium nitrate is Ca(NO3)2.
Sunday, April 29, 2012 at 3:35pm by DrBob222
College 103 Chem
How many mols do you need? That's M x L = 8.00 x 0.225 = ? Then mols = grams/molar mass. You know molar mass and mols, solve for grams.
Wednesday, July 10, 2013 at 9:33pm by DrBob222
You know the molar mass E = 51.413 from the problem. Therefore, mols element A were 21.29/51.413 = 0.4141 mols A. Convert that to element E. mols E = mols A x (1 mol E/2 mols A) = (1/2)*0.4141 = 0.20705. Convert that to molar mass knowing that 0.20705 mols = 58.37 g. We know #...
Tuesday, November 6, 2007 at 8:06pm by DrBob222
1. First you must write the equations and balance them. 2. Convert 2.47 g Cr to mols remembering that mols = grams/atomic mass. 3. Convert mols Cr to mols Na2S using the coefficients in the balanced equations. 4. Convert mols Na2S to grams using grams = mols x molar mass. Note...
Saturday, November 3, 2007 at 11:21am by DrBob222
M = mols/L of solution. You can calculate mols from mols = grams/ molar mass. You know molar mass CaCl2 and you know grams. Calculate mols from equation 2, and substitute in equation 1 to calculate molarity. Post your work if you need more help. I left a message for you on the...
Wednesday, May 7, 2008 at 9:02pm by DrBob222
Here is a site to help you with significant figures. http://www.chemteam.info/SigFigs/SigFigs.html 1. How many mols do you need? That's mols = M x L = ? Then mols NaI = grams NaI/molar mass NaI. You know molar mass and mols, solve for grams. 2. mols c6H12 = grams/molar mass ...
Tuesday, August 20, 2013 at 3:46pm by DrBob222
Arrows can be draw this way: --> or ==> The equation tells you that 6 mols CO2 will produce 1 mol C6H12O6. So 0.250 mols will produce 0.25 x (1 mol C6H12O6/6 mol CO2) = ?
Wednesday, June 20, 2012 at 1:54pm by DrBob222
Convert volume of H2O2 (the 1/2 cup) to grams H2O2 using density. Convert grams H2O2 to mols using mols = g/molar mass. Convert mols H2O2 to mols H2O using the coefficients in the balanced equation. Convert mols H2O to grams using mols x molar mass = grams. Follow the same ...
Tuesday, February 12, 2008 at 3:09pm by DrBob222
Convert 2 kg to grams = 2000 g and to mols. mols = grams/molar mass. Using the coefficients in the balanced equation, convert mols ethylene glycol to mols C2H4Cl2. Convert mols C2H4Cl2 to grams. g = mols x molar mass.
Sunday, June 10, 2012 at 10:14am by DrBob222
mols O2; use PV = nRT (remember T must be in kelvin) and solve for n = number of mols. Using the coefficients in the balanced equation, convert mols O2 to mols KO2. Now convert mols KO2 to grams. mols = grams/molar mass.
Monday, March 11, 2013 at 12:09am by DrBob222
mols Ag (part a) = g/molar mass = about 0.2 but you need to do it more accurately. Using the coefficients in the balanced equation convert mols AgNO3 to mols Ag2CO3. That is 0.2 mol AgNO3 x (1 mol Ag2CO2/2 mols Ag_) = 0.2 x 1/2 = aboaut 0.1 mol. g Ag2CO3 formed = mols x molar ...
Wednesday, February 6, 2013 at 8:36pm by DrBob222
Still stuck on this question. How many grams of Na3PO4 would you need to make 0.225L of 8.0M stock solution? 8.0 M of NaPo multiplied by .225L NaPO = 1.8 mols of Na3PO4. Then multiply the 1.8 mol times the mass of Na3PO4 which is 163.93 grams?, yes? This would make 295.07 ...
Sunday, July 14, 2013 at 1:35pm by Andrew
The stoichiometry problems are worked the same way. Just like yur NG problem. Step 1. Write and balance the equation. Step 2. Convert grams of what you have to mols. mols = grams/molar mass if solid or M x L = mols if liquid. Step 3. Convert mols of what you have to mols of ...
Saturday, September 28, 2013 at 10:00pm by DrBob222
If 20.0 grams of Al is placed into a solution containing 115 grams of H2SO4, how many grams of hydrogen gas could be produced? 1. Write the balanced equation. 2Al + 3H2SO4 ==> Al2(SO4)3 + 3H2 2. Convert 20.0 g Al to mols. Remember mols = g/atomic mass 3. Using the ...
Sunday, March 18, 2007 at 8:28pm by Britney
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
Chemistry! Test tomorrow, pls help !
This is a stoichiometry problem with an extra step of % thrown into the mix. C6H6 + Br2 ==> C6H5Br + HBr. mols bromobenzene in 50 g is 50/molar mass bromobenzene. Now you wan to convert mols bromobenzene to mols benzene. Since the equation shows you it is 1 mol benzene to 1...
Thursday, October 4, 2012 at 10:03pm by DrBob222
Your friend is right. mols needed = M x L = 13317*0.504 = ? Then mol = grams/molar mass so ?mols x molar mass Ci(NO3)2 = ? and I get something like 126 grams or so. Convert g Cu(NO3)2 to mols. mols = grams/molar mass Then M = mols/L soln. The answer is about 0.9 M.
Monday, April 29, 2013 at 12:12pm by DrBob222
How many mols do you need? That's M x L = mols = ? Then grams = mols x molar mass
Sunday, November 25, 2012 at 9:32pm by DrBob222
You need how many mols? That's M x L = ?mols K2SO4. mols = grams/molar mass. You know molar mass and mols, solve for grams. Here is how you do it. Weigh ? grams K2SO4, place in a 250 mL volumetric flask, add SOME water and swirl until K2SO4 is completely dissolved, then add ...
Tuesday, January 15, 2013 at 9:35pm by DrBob222
mols Na2CO3 = grams/molar mass mols HCl = 2x mols Na2CO3 (from the coefficients). M HCl = mols HC/L HCl. You know M HCl and mols HCl, solve for L and convert to mL. By the way, you don't need to assume that 3M HCl contains 3 mols HCl/L soln. Why? Because that IS the definition...
Monday, April 30, 2012 at 2:07pm by DrBob222
Convert g nitro to mols. mols = grams/molar mass. Using the coefficients convert mols nitro to mols H2O, mols CO2, mols N2, and mols O2. Add mols to obtain total mols, then use PV = nRT to calculate volume in L.
Tuesday, October 15, 2013 at 5:17pm by DrBob222
1. Write the equation. 2. Convert what you have to mols. L x M = mols. 3. Convert mols of what you have from step 2 (mols HCl) to mols of what yu want, in this case it is NaHCO3. 4. Convert mols NaHCO3 to grams NaHCO3. mols x molar mass = grams. Post your work if you get stuck.
Wednesday, February 27, 2008 at 3:52pm by DrBob222
You want grams, don't you? The formula I have came from this. molality = mols/kg solvent. Solve for mols. mols = molality x kg solvent. mols also = grams/molar mass so we set mols = mols so molality x kg solvent = g/molar mass multiply both sides by molar mass an we have ...
Tuesday, February 5, 2008 at 10:09pm by drbob222
1. Calculate mols HCl initially. mols = M x L. 2. Calculate mols HCl at the end of the reaction. 3. Subtract and that is mols HCl used. 4. Using the coefficients in the balanced equation, convert mols HCl to mols Zn. 5. Convert mols Zn to grams Zn. mols x molar mass = grams. ...
Monday, September 22, 2008 at 3:01pm by DrBob222
0.025M NaAc: How many mols do you need? That M x L = mols. Then mol = grams/molar mass. You know molar mass and mols solve for grams. 0.001% w/v starch. 0.001g (1 mg) starch in 100 mL solution.
Sunday, February 10, 2013 at 3:08pm by DrBob222
Remember the definitions. That's all you need. molarity = # mols/L solution. molality = # mols/kg solvent. # mols = grams/molar mass.
Monday, August 4, 2008 at 9:46pm by DrBob222
The average human requires 120.0 grams of glucose (C6H12O6) per day. How many grams of CO2 ( in the photosynthesis reaction) are required for this amount of glucose? The photosynthetic reaction is: 6 CO2 + 6 H2O = C6H12O6 + 6 O2
Wednesday, January 19, 2011 at 9:19pm by Artie
Here are the steps to work any simple stoichiometry problem (like this one). You must make a slight adjustment when you get to limiting reagent problems but they are almost the same. Print this out. Keep it. Memorize the steps. Step 1. Write and balance the equation. C3H8 + ...
Thursday, September 19, 2013 at 3:58pm by DrBob222
mols NH4NO2 (is that what you meant to type?) = grams/molar mass = about 5 mols but you need to confirm that. Therefore, you must have produced 5 mols N2 and 10 mols H2O for a total of 15 mol. Use PV = nRT and solve for V in L.
Wednesday, November 14, 2012 at 6:21pm by DrBob222
These are stoichiometry problems. 1. Balance the equations. 2. Convert 12.5 g of the reactant indicated to mols. mols = grams/molar mass. 3. Using the coefficients in the balanced equation, convert mols of what you have to mols of what you want. 4. Convert mols of the product ...
Wednesday, June 25, 2008 at 2:59pm by DrBob222
You don't say but I think you must be quoting percent volume. Find volume of room, I suggest, in cc and change to liters. Change liters at conditions listed to standard conditions. Standard conditions are 101 325 Pa for pressure and 273 K for temperature. Use P1V1/T1 = P2V2/T2...
Monday, April 28, 2008 at 1:16pm by DrBob222
a. mols H2S = grams/molar mass Use the coefficients in the balanced equation to convert mols H2S to mols HI. That will be ?mols H2S x (2 mols HI/1 mol H2S) = ?mols H2S x 2/1 = ? mols HI Then convert mols HI to grams HI. grams = mols x molar mass. This is the theoretical yield...
Friday, October 19, 2012 at 1:10pm by DrBob222
5 mols Zn x (100/85) = ?? mols Zn You want grams, Convert mols Zn to grams by grams = mols x molar mass.
Tuesday, June 10, 2008 at 8:48pm by DrBob222
Write the equation between oxalate and permanganate and balance it. Calculate mols MnO4^- = M x L = ? Using the coefficients in the balancaed equation, convert mols MnO4^- to mols C2O4^2-. Then mols = grams/molar mass You have mols and grams, solve for molar mass. Then ...
Sunday, April 8, 2012 at 9:42pm by DrBob222
What is the solvent? Water? How many mols do you want? That's mols = M x L = ? Then mols = grams/molar mass. You know molar mass and mols, solve for grams. Weigh out that many grams of acetone, add to a 500 mL volumetric flask, add H2O to the mark, stopper and shake thoroughly...
Friday, October 26, 2012 at 1:04am by DrBob222
H3PO4 equation is balanced. Convert what you have to mols. M x L = mols. Convert mols of what you have to mols of what you want. Convert mols of what you want to grams. grams = mols x molar mass. For the second question, which is incomplete, a is 132.141 but check my work ...
Thursday, February 28, 2008 at 6:09pm by DrBob222
How many moles do you want? That's M x L = 0.2 x 0.500 =? Then mols = grams/molar mass. You know mols and molar mass, solve for grams. Weigh out that many grams, place in a 500 mL volumetric flask, swirl until all of the solid is dissolved, make to the mark with distilled ...
Wednesday, September 26, 2012 at 9:50pm by DrBob222
Use density ethanol to calculate grams. Convert grams ethanol to mols. mols = grams/molar mass. Then M = mols/L soln.
Saturday, September 29, 2012 at 12:56am by DrBob222
K2HPO4 + NaOH ==> K2NaPO4 + H2O mols NaOH = M x L = ? Using the coefficients in the balanced equation convert mols NaOH to mols K2HPO4. Now grams K2HPO4 = mols x molar mass and % K2HPO4 = (grams K2HPO4/mass sample)*100 = ? For #2, plug in 0.1080 for M and 0.02340 for L and ...
Tuesday, December 3, 2013 at 6:32pm by DrBob222
Convert grams nitroglycerin to mols. mols = grams/molar mass Use the coefficients in the balanced equation to convert mols nitroglycerin to mols of each product. Find total mols and convert to volume in liters.
Saturday, February 9, 2013 at 7:52pm by DrBob222
a. Convert 1.00 g Fe(OH)3 to mols. mols = grams/molar mass. Use the coefficients in the balanced equation to convert mols Fe(OH)3 to mols H^+. mols HCl = M x L. You know mols HCl and M HCl, solve for L and convert to mL. b. M Fe^3+ = mols/L soln You know mols from part a, L ...
Sunday, November 11, 2012 at 5:16pm by DrBob222
0.2688 what? grams? HA + KOH ==> KA + H2O mols KOH = M x L = ? mols HA = mols KOH (look at the coefficients in the balanced equation.) mols = grams/molar mass. You know mols and grams, solve for molar mass.
Tuesday, November 27, 2012 at 12:55pm by DrBob222
(OH^-) = 0.50M; therefore, NaOH = 0.5M. How many mols do you need? That's M x L = 0.5M x 2.75L = ? Then mols = grams/molar mass. You know molar mass and mols, solve for grams.
Friday, November 23, 2012 at 12:56pm by DrBob222
mol Mg(OH)2 = grams/molar mass = 21.66g/molar mass. There are twice as many mols of H atoms since there are two H atoms/molecule Mg(OH)2. mols BF3 = 8.63E23/6.02E23 = ? There are 3x as many F mols. Then g = mols x atomic mass.
Sunday, February 3, 2013 at 5:59pm by DrBob222
How many moles do you need? mols = M x L = ? Then mols = grams/molar mass. You know molar mass and mols, solve for grams.
Monday, November 5, 2012 at 4:43am by DrBob222