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April 19, 2014

Search: What minimum mass of HCl in grams would you need to dissolve a 2.5g iron bar on a padlock?

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chemistry
What minimum mass of HCl in grams would you need to dissolve a 2.5g iron bar on a padlock?
Wednesday, May 25, 2011 at 7:37pm by Anonymous

CHemistry- For Dr.Bob
I found your question of last Tuesday, July 31. You wanted mass HCl soln. That is 1.05 x 5.00 mL = 5.25 g mass HCl in the 5.00 mL. That = mols HCl (which you obtained from M x L) x molar mass HCl = grams HCl. Then mass H2O = 5.25 - grams HCl = mass H2O.
Thursday, August 2, 2012 at 6:01pm by DrBob222

Chemistry
First you want to determine the molarity of the 36% HCl. M = mols/L. The density is 1.183 g/cc. How much does 1000 mL weigh? That's 1.183 x 1000 mL = ?grams = mass 1 L. How much of that is HCl? 36%. So ? grams x 0.36 = ? g HCl. The rest of it is water. How many mols HCl is ...
Saturday, January 19, 2013 at 12:21pm by DrBob222

chem
I can't seem to figure this out! I know I have to use mass to mass conversions though. Can someone help me out? Hydrochloric acid can dissolve solid iron according to the following equation: Fe + 2HCl to form FeCl2 + H2 a) How much HCl in grams would you need to dissolve a 2.8...
Thursday, March 1, 2007 at 6:20pm by Abby

Chemistry
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

Chemistry
1. mols HCl = M x L = ? mols NaOH = mols HCl mols NaOH = grams/molar mass. You know molar mass and mols, solve for grams. 2.mols NaOH = grams/molar mass = estimated 0.01 mols HCl = grams/molar mass = estimated 0.02. NaOH + HCl ==> NaCl + H2O 0.02 mols HCl - 0.01 mols NaOH...
Thursday, May 9, 2013 at 2:22pm by DrBob222

Chemistry
I think the easiest way to solve this problem is to a)determine molarity of the HCl solution. b) apply the dilution formula. a) 1.18g/mL x 1000 mL = mass of 1 L HCl soln. How much is HCl? That will be mass of 1L x 0.36 = ?? g HCl How many moles is that. That will be grams HCl/...
Tuesday, June 7, 2011 at 6:32pm by DrBob222

chemistry 11
moles HCl = 1995.5/molar mass HCl = ? ? moles HCl x molar mass HCl = grams HCl. g HCl x (molar mass Cl2/2*molar mass HCl)= grams Cl2.
Sunday, November 6, 2011 at 10:13pm by DrBob222

science
How many grams of hydrochloric acid are required to react completely with 4.30g of zinc? How many molecules of gas will be produced? 1. Write the balanced chemical equation. Zn + 2HCl ==> ZnCl2 + H2 2. Convert grams Zn to mols. mols = grams/atomic mass Zn. 3. Using the ...
Saturday, March 17, 2007 at 10:58pm by Josh

Chemistry - titration lab
Those are two different questions. mass HCl in 5.00 mL = mols HCl in 5.00 mL x molar mass HCl mass 5.00 mL soln = 5.00 x 1.05 g/mL = ? Because of the stoichiometry of the titration of NaOH + HCl, the MOLES are equal at the equivalence point but not the grams. 1mol HCl = 1 mol ...
Tuesday, July 31, 2012 at 11:42am by DrBob222

Chemistry
it would take 30 grams of HCl to react completely with BaCO3, since it's a 1 to 2 ratio 30 grams of HCl = 1 mole/36 grams so it's .83 moles of HCl
Sunday, March 21, 2010 at 12:56pm by Margaret

Chemistry Math
First determine the molarity of the HCl from the standardization part of the problem (the second part of the problem) using 0.1876 g NaHCO3 and 37.86 mL HCl. NaHCO3 + HCl ==> NaCl + H2O + CO2 mols NaHCO3 = grams/molar mass mols HCl = mols NaHCO3 M HCl = mols HCl/L HCl. Then...
Sunday, November 18, 2012 at 1:18pm by DrBob222

chemistry
I have a 0.25 m aquaeous solution of HCL. It's density is 1.05 g/ml. WHat is the % by mass (m/m) of this solution? What is the molarity of the solution? define molality. m = # mols/kg solvent. We have 0.25 m so we must have 0.25 x 36.5 g/mol HCl = 9.125 g HCl/1000 g solvent. ...
Tuesday, March 20, 2007 at 9:26pm by nancy

chemistry
Your question isn't stated very well. Do you mean something like this? Prepare 100 mL of a 500 mM HCl solution using HCl with a purity of 37% HCl and a density of 1.18 g/mL. If so, the first thing to do is to calculate the molarity of the 37% HCl solution. That will be 1000 mL...
Wednesday, March 30, 2011 at 11:26pm by DrBob222

chemistry
moles HCl = M x L = 0.1098M x 0.02902L = approximately 0.003 The NH3 + HCl equation is balanced and it is 1 mole NH3 to 1 mole HCl; therefore, moles NH3 = moles HCl. grams NH3 = moles NH3 x molar mass NH3 = approximately 0.05 g NH3 in the titrated sample (the 13.803 g portion...
Monday, November 14, 2011 at 3:25am by DrBob222

chem
how would you prepare 445 grams of solution containing 13% mass HCL from 34.1 mass % of HCL solution
Monday, February 24, 2014 at 5:32pm by SDW

CHEMISTRY
Didn't I do this for you yesterday? You want M x L = mols HCl = 0.1M x 0.250 L = ? Then moles HCl = grams HCl/molar mass HCl.
Wednesday, March 14, 2012 at 6:49pm by DrBob222

College Chemistry
You didn't provide the volume or M of the HCl and you must have that to answer this question. You added an excess of HCl. How much HCl did you add? moles HCl = M x L = ? Then you back titrated with NaOH. mols NaOH = M x L = ? The difference in moles = moles of acid consumed by...
Monday, November 21, 2011 at 12:32am by DrBob222

Chemistry
NH3 + HCl ==> NH4Cl 5.5 kg = 5500 g Convert to moles. moles = grams/molar mass = ? 1 mole NH3 requires 1 mol HCl; therefore, moles NH3 = moles HCl. M HCl = moles HCl/L HCl. You know M HCl and moles HCl, solve for L HCl
Saturday, February 11, 2012 at 9:14pm by DrBob222

Chemistry :(
12M HCl means 12 mols HCl/L solution. Use density to convert L solution to grams. That is approximately 1200 grams (water + HCl). You know how much the HCl weighs; it is 12 mols or 12*36.5 = about 440g. Therefore, the water must have a mass of 1200-440 = about 762 or 0.762 kg...
Tuesday, January 22, 2013 at 8:09pm by DrBob222

Chemistry
2NaHCO3 + 2HCl ==> 2H2O + 2CO2 + 2NaCl Convert 1 g NaHCO3 to moles. moles = grams/molar mass Using the coefficients in the balanced equation, convert moles NaHCO3 to moles HCl. And you have your answer. You can convert this to grams HCl by multiplying moles x molar mass = ...
Monday, March 15, 2010 at 5:51pm by DrBob222

chemistry
Mg(OH)2 + 2HCl ==> 2H2O + MgCl2 mols Mg(OH)2 = grams/molar mass Convert mols Mg(OH)2 to mols HCl using the coefficients in the balanced equation. That's mols HCl = 2x mols Mg(OH)2. Then M HCl = mols HCl/L HCl. You know mols HCl and M HCl, substitute and solve for L HCl.
Sunday, September 29, 2013 at 5:16pm by DrBob222

Chemistry
Hi, Please provide assistance on the following problem. I worked out part of it, but do not know what to do after calculating pH for HCl. Suppose you dissolved 0.0365 grams of HCl in water to give a final volume of 10.0 mL. The molar mass of HCl is 36.5 g/mole and the molar ...
Monday, March 19, 2012 at 12:00am by Jeremy

Chemistry. please help
The problem doesn't establish that this is a mono, di, or triprotic base but I assume one(1) OH group and we shall call it B + HCl ==> BH^+ + Cl^- How many moles HCl did we add to reach end point? That is M x L = ?? moles base = same as mole HCl added. moles = grams/molar ...
Wednesday, December 8, 2010 at 8:42pm by DrBob222

chemistry
I need help Calculating the mass of HCL neede to react with 20.0 grams Zn. Zn+HCL -> ZnCl2+H2
Monday, February 9, 2009 at 6:50pm by Natalie

chemistry
density = 1.18 g/mL. mass of 1,000 mL = 1.18 g/mL x 1000 mL = 1180 grams soln. How much of that is HCl? 1180 g x 0.15 = xx g HCl (the remainder is water or 1180 - xx =?? but normally you never need this). How many mols is that in the soln? xx gHCl/molar mass HCl = yy mols HCl...
Wednesday, January 16, 2008 at 3:16pm by DrBob222

chemistry
All of these stoichiometry problems are about alike. 1. Write and balance the equation. 2. Convert grams Mg to moles. moles = grams/molar mass. 3. Using the coefficients in the balanced equation, convert moles Mg to moles HCl. 4. Now convert moles HCl to grams HCL. g = moles x...
Thursday, March 11, 2010 at 5:56pm by DrBob222

Chemistry
1. construct a balance equation for HCl and Zn reaction and note the mole ratio between HCl and Zn. 2. calculate the mass of Zn from the ore i.e. 36.0% of 7.55g gives the mass of Zinc. 3. Calculate the mole of zinc using n = m/Mr where Mr is the molar mass of zinc and m is the...
Sunday, June 16, 2013 at 11:42pm by bonjo

chemistry
Technically, there may not be ANY HCl in the Lysol but you may calculate the acidity in terms of the HCl content. moles NaOH = M x L = ?? moles HCl = same thing since 1 mole NaOH exactly neutralizes 1 mole HCl. g HCl = moles HCl x molar mass HCl. %HCl = (mass HCl/mass sample)&...
Monday, June 21, 2010 at 7:41pm by DrBob222

chemistry
BaCO3 + 2HCl ==> H2O + CO2 + BaCl2 mols CaCO3 = grams/molar mass = ? mols HCl = 2x that. (Look at the coefficients in the balanced equation.) M HCl = mols HCl/L HCl You have mols and M, solve for L HCl and convert to mL.
Sunday, September 29, 2013 at 1:57pm by DrBob222

Chemistry
How many moles do you need for 22 g? That is moles = grams/molar mass. Solve for moles. Then M HCl = moles HCl/L HCl. Solve for L and convert to mL.
Thursday, September 15, 2011 at 9:01pm by DrBob222

Chem
You need to have two pieces of information before applying the dilution formula. 1. You need to convert pH to M. pH = -log(H^+) 2.13 = pH. I get (H^+) = approximately 0.007 but you need to do that more accurately. 2. You need to convert 36% HCl to molarity. density = 1.18; ...
Monday, February 28, 2011 at 1:50am by DrBob222

Chemistry
Given HCL + SrO --- SrCL2 + H20 Calculate the mass of HCl in grams that would react with 4.85 kg SrO.
Thursday, November 17, 2011 at 1:18pm by nms

Chemistry
mols KOH = grams/molar mass mols HCl = mols KOH (look at the coefficients in the balanced equation). M HCl = mol HCl/L HCl. Solve for L HCl and convert to mL.
Wednesday, March 27, 2013 at 5:26pm by DrBob222

chemistry 11
H2 + Cl2 ==> 2HCl 5.5..........199.5g The first post was the short way; however, I put an extra step that is not needed (but it didn't change the answer) and that may be what confused you. Here is a better way. moles HCl produced = grams/molar mass = 199.5/36.5 = about 5.5...
Sunday, November 6, 2011 at 10:13pm by DrBob222

CHEMISTRY
CaCO3(s)+2HCl(aq)>CaCl2(aq)+H2O(l)+CO2(g) I will estimate all of these numbers; you need to go through and recalculate each. mols CaCO3 = grams/molar mass = approx 0.30 mols HCl = grams/molar mass = approx 0.36 Convert mols CaCO3 to mols CaCl2 using the coefficients in the ...
Thursday, March 20, 2014 at 2:37pm by DrBob222

Chemistry
Please help me with these! Thanks :) Describe, in detail, how to make 5.5 liters of a 2.5 molar HCl solution from a 10.5 molar HCl stock solution. How many grams of a stock solution that is 85.5 percent H2SO4 by mass would be needed to make 150 grams of a 45.0 percent by mass ...
Sunday, February 27, 2011 at 8:50pm by Amanda

chemistry
pOH = 10 means pH = 4 from pH + pOH = pKw = 14. pH = 4 = -log(H^+). Solve for (H^+) = 1E-4 M You want how many mols? That's 1E-4 mols/L x 0.546 L = ? Then mol HCl = grams HCl/molar mass HCl. You know mols and molar mass, solve for grams HCl.
Wednesday, October 17, 2012 at 5:00pm by DrBob222

Chemistry
Given the following reaction: HCl(g) + SrO(s) SrCl2(s) + H2O Calculate the mass of HCl in grams that would react with 11.44 kg SrO.
Thursday, November 25, 2010 at 9:29pm by andrea

chemistry
Given the following reaction: HCl(g) + SrO(s) → SrCl2(s) + H2O Calculate the mass of HCl in grams that would react with 7.70 kg SrO
Monday, November 14, 2011 at 12:52pm by riali

Chem
Do my answers look correct for these? Thanks Calculate the mass percent of a solution containing 45.6 grams ethanol (C2H6O) in 245 grams of water. 15.7% You are asked to make 500.0 mL of a 4.5M solution of HCl, but the only HCl you have available to dilute is 18.0M. Describe ...
Monday, December 7, 2009 at 7:29pm by Matt

Chemisty
Use stoichiometry to back calculate from 5.3 g CaCl2 to see the moles HCl used (you could go the long way and calculate moles CaCO3 used then convert to HCl but that step isn't necessary). moles CaCl2 = grams/molar mass = 5.3/about 111 = about 0.048 (but you need to do it ...
Sunday, November 20, 2011 at 8:22pm by DrBob222

chemistry
Balance the equation first. mols Zn = grams/molar mass Using the coefficients in the balanced equation convert mols Zn to mols HCl. Then M HCl = mols HCl/L HCl. You know M HCl and mols HCl, solve for L HCl and convert to mL.
Monday, October 28, 2013 at 8:00pm by DrBob222

Chemistry
NaHCO3 + HCl ==> NaCl + H2O + CO2 moles HCl = M x L = ?? moles NaHCO3 (use the coefficients in the balanced equation) = moles HCl moles NaHCO3 = grams/molar mass. Solve for grams.
Wednesday, March 2, 2011 at 8:42pm by DrBob222

AP Chemistry
Write and balance the equation. Zn + 2HCl ==> ZnCl2 + H2 mols Zn = grams/molar mass Use the coefficients in the balanced equation to convert mols Zn to mols HCl. Now M HCl = mols HCl/L HCl. Youhave mols HCl and M HCl, solve for L HCl and convert to mL.
Tuesday, September 10, 2013 at 9:34pm by DrBob222

Chemistry
density 1.191 g/mL. mass 1000 mL = 1.191 g/mL x 1000 mL = 1191 g. mass HCl in that 1L = 1191 x 0.80 = 952.8 g HCl. mols HCl = grams/molar mass = 952.8/36.46 = 26.13 mols HCl. M = mols/L = 26.13/L = 26.13M BUT let me point out that this can't be so. The calculations are right ...
Friday, August 9, 2013 at 1:37pm by DrBob222

Chemistry
mols HCl = grams/molar mass M HCl = mols HCl/L HCl
Monday, January 28, 2013 at 3:56pm by DrBob222

Honors Chemistry 101
Do my answers look correct for these? Thanks Calculate the mass percent of a solution containing 45.6 grams ethanol (C2H6O) in 245 grams of water. 15.7% You are asked to make 500.0 mL of a 4.5M solution of HCl, but the only HCl you have available to dilute is 18.0M. Describe ...
Monday, December 7, 2009 at 1:46am by Matt

chemistry
To be a limiting reagent type problem BOTH reactants must be given; i.e., you have 35.0 mL of 0.300 M HCl (one of the reactants) but you don't have the other one (only that it is TUMS but no mass is given nor a percent composition--I thing the assumption is that you have ...
Friday, October 8, 2010 at 10:48pm by DrBob222

CHEMISTRY
You have 15.4 g HCl. How many mols is that? That's mols HCl = grams HCl/molar mass HCl. The M = mols/L solution. You know M and mols, solve for L.
Friday, November 15, 2013 at 6:23pm by DrBob222

chemistry
3HCl + Al(OH)3 ==> 3H2O + AlCl3 moles Al(OH)3 = grams/molar mass Using the coefficients in the balanced equation, convert moles Al(OH)3 to moles HCl. Then M HCl = moles HCl/L HCl. You know M and moles HCl, solve for L.
Sunday, October 16, 2011 at 7:45pm by DrBob222

Chemistry
HCl + KOH ==> KCl + H2L mols KOH = grams/molar mass mols KOH = mols HCl from the 1:1 ratio (coefficients) in the balanced equation. Then M HCl = mols HCl/L HCl. You know mols and M, solve for L and convert to mL.
Tuesday, April 1, 2014 at 8:28pm by DrBob222

Chemistry
mols HCl used = 0.05000 x 0.6230 = ? back titrated with NaOH = 0.0015 x 0.6115 = ? mols NH3 present = total mols HCl-mols NaOH in back titration. Then mol = grams/molar mass. You know mols and grams, solve for molar mass. Subtract total molar mass - N - 4*H to find atomic mass...
Wednesday, April 25, 2012 at 7:46pm by DrBob222

chem2
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

chemistry
mols HCl = grams/molar mass. (HCl) = M = mols/L soln. pH = -log(HCl)
Monday, December 17, 2012 at 3:28pm by DrBob222

chemistry
how many grams of H2 (g) are produced by the reaction of 1.35 g Al with 75.0 mL of 3.44 M HCl Here is the way to do most of these stoichiometry/limiting reagent type problems. Step 1. Write a balanced chemical equation. 2Al + 6HCl ==? 3H2 + 2AlCl3 Step 2. Convert what you have...
Sunday, September 24, 2006 at 9:06pm by brian

chemistry
How many moles HCl do you need? That is moles = M x L = ?? Then moles = grams/molar mass. Solve for grams.
Monday, September 26, 2011 at 2:59pm by DrBob222

Chemistry
1 mole Cl2 requires how much HCl? Use the coefficients in the balanced equation. 1 mole Cl2 x (16 moles HCl/5 moles Cl2) = ?? moles HCl required. Now convert that to grams. grams = moles x molar mass.
Sunday, November 1, 2009 at 4:48pm by DrBob222

chemistry
mols x molar mass = grams. You have grams HCl and molar mass HCl, substitute and solve for mols HCl. Then M x L = mols. You have mols and M, solve for L and convert to mL.
Thursday, September 13, 2012 at 5:13pm by DrBob222

CHemistry- For Dr.Bob
Yes I see my mistake now, because they first ask to find the moles of NaOH used, so would it simply be 0.015 mol? If I remember you had a density of HCl solution and the mass of that solution was mass = volume x density = 5 mL x density in g/mL = ? g. You can estimate the mass...
Thursday, August 2, 2012 at 6:01pm by Robert

chemistry
Convert 7.5 g HCl to mols. moles = grams/molar mass. Convert moles and volume to molarity. M = mols/L soln. HCl is a strong acid; i.e., it is ionized 100%; therefore, (H^+) of a solution of HCl = (HCl). Use (HCl) to convert to pH. pH = -log(H^+).
Sunday, February 27, 2011 at 12:53pm by DrBob222

Chemistry
HCl + NaHCO3 ==> NaCl + H2O + CO2 You don't have enough information to answer the question. You have M HCl and that's all. You must have the volume of HCl if you are to calculate the grams NaHCO3. I might point out that this would not be a very good airbag as it would ...
Wednesday, May 29, 2013 at 5:23pm by DrBob222

Chemistry
Technically this problem can't be worked without know the density of the solution or the final volume. We will assume that the final volume is 1L. moles HCl = grams HCl/molar mass HCl. Then M HCl = moles/L soln Finally, pH = -log(H^+)
Wednesday, June 29, 2011 at 12:31pm by DrBob222

Chemistry
You need to learn where the arrow keys are (and use them). mols HCl = grams/molar mass Convert mols HCl to mols H2 using the coefficients in the balanced equation. . Convert mols H2 to g. g = mols x molar mass.
Monday, March 18, 2013 at 3:19pm by DrBob222

Biochem
10ml of HCl acid titrate with 9.9ml of NaOH. What is the mass in grams of HCl?
Tuesday, August 3, 2010 at 5:04pm by Amrik

chemistry
M = mols/L, then 1.19 g/mL x 1000 mL x 0.37 x (1 mol/molar mass HCl) = M = approximately 12M m = mols/kg solvent. How many grams of the solution do you have above? You know that's 1.19 x 1000 = g soln. How many grams HCl are there? That's g soln x 0.37 How many grams water (...
Monday, January 21, 2013 at 9:56am by DrBob222

Chem
2C2H4 + O2 + 4HCl ==> 2C2H4Cl2 + 2H2O mols HCl = 610,000/molar mass = ? Convert mols HCl to mols product using the coefficients in the balanced equation. ?mol HCl x (2 mol C2H4Cl2/4 mols HCl) = ? mols HCl x 1/2 = x mol C2H4Cl2. Now convert mols C2H4Cl2 to grams. g = mols x ...
Thursday, October 18, 2012 at 1:42am by DrBob222

chemistry-0.1NHCl
Normality = equivalents/liter of solution. I think 1 L has a mass of 1.190 kg (or 1190 grams), not 1190 kg. Of that 1190, how much is HCl. 1190 g x 0.37 = y grams HCl How many equivalents is that? y/equivalent mass (and in this case, equivalent mass and molar mass are the same...
Thursday, December 18, 2008 at 10:25pm by DrBob222

chemistry
Convert 4.22 g Mg(OH)2 to mols. mols == grams/molar mass = ? Using the coefficients in the balanced equation, convert mols Mg(OH)2 to mols HCl. M HCl = mols HCl/L HCl.; You know M and mols, solve for L HCl
Tuesday, June 5, 2012 at 7:41pm by DrBob222

chemistry
#1, calculate the M of the commercial solution. 1000 mL x 1.20 g/mL x 0.37 = grams HCl/1L grams/molar mass HCl = ?M since that will be moles/L. Then Mconcd x ?mL concd = 0.500M x 2,500 mL Solve for ?mL.
Sunday, November 6, 2011 at 1:16am by DrBob222

Chemistry
Using the coefficients in the balanced equation, convert 1 mole Cl2 gas to moles HCl. Convert moles HCl to grams. Grams = moles x molar mass Post your work if you get stuck.
Sunday, November 1, 2009 at 4:48pm by DrBob222

Chemistry
Ca(OH)2 + 2HCl --> CaCl2 + 2H2O Find the moles of Ca(OH)2 = grams / formula mass moles of HCl = (2)[moles of Ca(OH)2] <-- see equation. volume of HCl = moles HCl / molarity of HCl
Thursday, February 19, 2009 at 12:10pm by GK

chemistry
0.2 Grams of HCL is dissolved in 0.8g of water. The density of the solution formed is 1.10g/ml. What is the molarity of the solution???? %HCl = [0.2/0.2+0.8)]x100 = 20% Density = 1.10 g/mL. The mass of 1,000 mL is 1.10 g/mL x 1,000 mL = 1100 grams. Mass HCl in the 1100 g is ...
Monday, February 5, 2007 at 11:30pm by boo

science need help
2 H2 + O2 -> 2 H2O 2 grams + 32 grams -> _ _ _ _ _ grams how would the mass of water formed in the reaction compare to the mass of oxygen and hydrogen that reacts? include types of change illustrated in the balanced equation. explain the conversation of matter and ...
Sunday, March 31, 2013 at 4:37pm by jeff

science need help
2 H2 + O2 -> 2 H2O 2 grams + 32 grams -> _ _ _ _ _ grams how would the mass of water formed in the reaction compare to the mass of oxygen and hydrogen that reacts? include types of change illustrated in the balanced equation. explain the conversation of matter and ...
Monday, April 1, 2013 at 9:54am by jeff

Chemistry
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

chemistry/science
Convert 0.10 g Mg to mols. Convert mols Mg to mols HCl. Convert mols HCl to grams HCl. This will give you grams HCl, however, not volume. The volume HCl can't be calculated unless there is some concentration of HCl given (at least if I read the problem correctly).
Wednesday, September 24, 2008 at 5:46pm by DrBob222

chemistry
You need to learn to use the caps key when you do chemistry because co, Co and CO and not the same. Mg + 2HCl ==> MgCl2 + H2 How many mols Mg? That's 2.50 mols in the problem. Using the coefficients in the balanced equation, convert mols Mg to mol HCl. That will be 2.50 x (...
Thursday, February 23, 2012 at 8:31pm by DrBob222

Chemistry
CaCO3 + 2HCl ==> CaCl2 + H2O + CO2 1. mols HCl added = 1.5L x 1.45M = about 2 mol HCl but you need to do it more accurately. That reacts with all of the CaCO3 but doesn't use all of the HCl. 2. Excess HCl requires how many mols. That's 0.850L x 0.543M NaOH = about .46 mols ...
Monday, December 3, 2012 at 10:31pm by DrBob222

Chemistry
mols HCl = grams/molar mass Then M HCl =mols HCl/L HCl M HCl = M (H^+) Then pH = -log(H^+) and pH + pOH = pKw = 14. You know pH and pKw, convert to pOH.
Saturday, April 5, 2014 at 1:55pm by DrBob222

chemistry
mols HCl used = M x L = ? Now use the coefficients in the balanced equation to convert moles HCl to moles CaCO3. moles HCl x (1 mole CaCO3/2 moles HCl) = ?moles HCl x 1/2 = xx moles CaCO3. grams CaCO3 = moles x molar mass and convert to mg.
Tuesday, November 15, 2011 at 9:24am by DrBob222

Chemistry
This is a limiting reagent (LR) problem. I know that because amounts are given for BOTH reactants. C2H4 + HCl ==> CH3CH2Cl Convert grams C2H2 to mols. mols = grams/molar mass Do the same for HCl Using the coefficients in the balanced equation convert mols C2H4 to mols ...
Sunday, November 3, 2013 at 4:39pm by DrBob222

Chemistry
This is a limiting reagent (LR) problem. You know that because amounts are given for BOTH reactants. Is that 10% w/v HCl? If so then you have 10 g HCl/100 mL or 1.0 g HCl/10 mL. mols HCl = grams/molar mass = 1.0/36.5 = ? mols NaHCO3 = grams/molar mass -= ? HCl + NaHCO3 ==> ...
Monday, November 4, 2013 at 12:48pm by DrBob222

Chemistry
Write the equation and balance it. Convert 2.2 g Zn to mols. mols = grams/molar mass. Use the coefficients in the balanced equation to convert mols Zn to mols HCl. M HCl = mols HCl/L HCl. You know moles and M, solve for L HCl and convert to mL.
Saturday, September 29, 2012 at 5:06pm by DrBob222

chemistry
Three steps. 1. mols CaCO3 = grams/molar mass. 2. Using the coefficients in the balanced equation convert mols CaCO3 to mols HCl. 3. Convert mols HCl to grams. g = mols x molar mass.
Tuesday, July 16, 2013 at 3:31pm by DrBob222

chemistry
Na2CO3.H2O + 2HCl ==> 2H2O + CO2 + 2NaCl mols Na2CO3.H2O = grams/molar mass = about 0.014 but you need to do it better than that. mols HCl = M x L = about 0.030 mols CO2 that could be produced from Na2CO3 = 0.014 mols CO2 that could be produced from HCl = about 0.03 In ...
Wednesday, February 13, 2013 at 7:53pm by DrBob222

Chemistry
This problem is confusing. Is that second titration a 25 mL aliquot of the original or has the solution been boiled so that the new volume is only 25 mL. If the latter, then MCO3 + 2HCl ==> MCl2 + CO2 + H2O mols HCl initially = 0.250 L x 0.203 M = 50.75/1000 = ? mols NaOH ...
Saturday, March 22, 2014 at 9:39am by DrBob222

chemistry
Write the balanced equation. 2HCl ==> H2 + Cl2 Convert 25 g HCl to moles. #moles = grams/molar mass. Using the coefficients in the balanced equation, convert moles HCl to moles Cl2. Convert moles Cl2 to grams. # grams = moles x molar mass. This # grams is the theoretical ...
Sunday, September 6, 2009 at 9:14pm 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
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

chemistry
mols HCl needed = M x L = ? moles = grams/molar mass Solve for grams.
Thursday, June 23, 2011 at 8:01pm by DrBob222

chemistry
Ca(OH)2 + 2HCl ==> CaCl2 + 2H2O mols Ca(OH)2 = grams/molar mass = ?? mols HCl needed = mols Ca(OH)2 x (2 mols HCl/1 mol Ca(OH)2) = mols Ca(OH)2 x (2/1) = xx mols HCl Molarity HCl = mols/L. You know molarity and mols. Solve for Liters HCl. Check my
Thursday, March 6, 2008 at 10:43pm by DrBob222

Chemistry
mols Zn = grams/molar mass = ? Using the coefficients in the balanced equation, convert mols Zn to mols HCl. Then M HCl = mols HCl/L HCl. You know mols and M, solve for L and convert to mL.
Friday, October 4, 2013 at 11:21pm by DrBob222

Chemistry
the second one is very similar except you need to know how many moles of Calcium are 2.94 grams atomic mass of calcium = 40 grams/mole approx so 2.94 g /40 g/mole = .0735 moles of Ca so you will need twice that many moles of HCl
Saturday, November 30, 2013 at 5:35pm by Damon

Chemistry
How many grams of a 12.5% (w/w) aqueous solution of HCl do you have to measure out if yo need 32g Of HCl?
Thursday, August 9, 2012 at 5:51pm by Jim

College Chemistry
HClO4 is a strong acid. HCl (solution) is a strong acid. Calculate moles L H^+ in each, add them together for total moles H^+. How much does a L weigh? 1000 mL x 1.01 g/mL = 1010 grams. How much HCl does that contain? 1.8%; therefore, 1010 x 0.018 = ?? grams HCl. How many ...
Sunday, March 7, 2010 at 4:49pm by DrBob222

chemistry
1. Write and balance the equation. 2. Convert 0.055 g Al(OH)3 to moles. moles = grams/molar mass. 3. Using the coefficients in the balanced equation, convert moles Al to moles HCl. 4. Molarity = moles HCl/L of HCl. You know moles HCl and Molarity; calculate L of HCl.
Tuesday, April 27, 2010 at 7:02pm by DrBob222

AP Chemistry
The Chemical reaction is: Mg + 2HCl --> MgCl2 + H2 1) Divide the grams of Mg by the atomic mass of Mg to get moles of Mg. 2) Moles of HCl = (2)(moles of Mg) 3) Moles of HCl = (V)(5.0 mol/L) or Volume of HCl = (mol. HCl) / (5.0 mol/L) --------- NOTE: The volume of HCl will ...
Sunday, November 8, 2009 at 12:39pm by GK

chemistry
NH3 HCl ==> NH4Cl mols HCl = M x L = ? mols NH3 must be the same as mols HCl. mols N (not N2) = same as mols NH3. g N = mols N x atomic mass N = ? %N = (grams N/mass sample)*100 = ?
Thursday, November 1, 2012 at 1:32am by DrBob222

Chemistry
Determine how many grams of active antacid ingredient AL(OH)3 would be necessary to neutralize the HCL in 50.0 mL of .0100 M HCL (an approximation of the conc. of HCL in the stomach) 3HCL9aq)+AL(OH)3(s)-> AlCL3 (aq) = 3H2O (L)
Tuesday, June 7, 2011 at 7:35pm by Vinny

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