Sunday
April 20, 2014

Search: zn+2hcl=zncl2+h2

Number of results: 4,503

General Chemistry
A 0.1358g zinc metal reacts completely with Dil HCL to produce 52.20ml of H2(g) at 22.0 degrees Celsius. The hydrogen gas is collected over water at 22.0 degree Celsius and a barometric pressure of 755 mm Hg. The water vapor pressure at 22.0 degrees Celsius is 19.8 mm Hg and ...
Monday, September 5, 2011 at 5:57pm by Kathy

Chem
Find pH. A) 0.10M Zn(OH)4^-2 F) Zn(OH)2 in 0.010M ZnCl2 Q) 0.010 M Zn(NH3)4^+2 hint: fined [NH3] then kb for OH^- Im having trouble with these can someone help me.
Sunday, March 25, 2012 at 8:46pm by Alison

chemistry
1 2Mg + o2 --> 2Mgo 2 MgCo3 --> MgO + Co2 3 Co2 + Ca(OH)2 --> CaCo3 + h2O 4 Zn + 2HCl --> ZnCl2 + H2 5 2H2 + O2 ---> 2H2O 2 KI + Pb(NO3)2 --> 2KNO3 + PbI2 endothermic is absorbs energy. exothermic is releases energy. which of those reaction are endothermic? ...
Thursday, November 8, 2012 at 10:23pm by peter

chemistry
A student generates H2(g) over water using the reaction between zinc and hydrochloric acid Zn(s)+ 2HCl(aq)---> ZnCl2(aq)+ H2(g) Data: Mass of vial and zinc 15.5082 mass of vial 15.3972 mass of zinc 0.111 final burette reading 45.30mL barometric pressure: Patm 100.6kPa ...
Wednesday, November 23, 2011 at 10:59pm by Yuli

Chemistry
Zn + 2HCl ==> Zn^2+ .... g Zn = 5.95*0.35 = ? mols Zn = ?g Zn/atomic mass Zn Convert mols Zn to mols HCl using the coefficients. M HCl = mols HCl/L HCl. You know M and mols, solve for L and convert to mL.
Wednesday, March 20, 2013 at 10:43pm by DrBob222

chemistry
A student generates H2(g) over water using the reaction between zinc and hydrochloric acid Zn(s)+ 2HCl(aq)---> ZnCl2(aq)+ H2(g) Data: Mass of vial and zinc 15.5082 mass of vial 15.3972 mass of zinc 0.111 final burette reading 45.30mL barometric pressure: Patm 100.6kPa ...
Thursday, November 24, 2011 at 12:14am by Yuli

chemistry
A chemist wishes to determine the rate of reaction of zinc with hydrochloric acid. The equation for the reaction is: Zn(s) + 2HCl(aq) ---> H2(g) + ZnCl2(aq) A piece of zinc is dropped into 1.00 L of 0.100 M HCl and the following data were obtained: Time/Mass of Zinc 0 s/0....
Saturday, April 17, 2010 at 5:58pm by Juggy

Chemistry multiple choice
During today’s experiment we will produce hydrogen gas (H2) using zinc metal (Zn(s)) and hydrochloric acid (HCl). Which is a balanced net ionic equation illustrating this process? A. Zn (s) + 2 HCl (aq) --> Zn2+ (aq) + H2 (g) + 2 Cl- (aq) B. Zn (s) + 2 H+ (aq) --> Zn2...
Wednesday, December 1, 2010 at 10:28am by Nana

chemistry
1. Use PV = nRT and solve for n = number of mols H2. P = (761.8- vapor pressure H2O @ 20C)/760 = atm. V = 0.0948 L R = 0.08206 L*atm/mol*K T = 273 + 20 = ? 2.mols Zn = grams/molar mass Convert mols Zn to mols H2 using the coefficients in the balanced equation. That's mols H2...
Monday, December 3, 2012 at 9:58pm by DrBob222

chemistry
Strange wording. I assume you want to know % yield when 20g Znb produced 5.4L H2. Zn + H2O ==> ZnO + H2 mols Zn = grams/atomic mass Use the coefficients in the balanced equation to convert mols Zn to mols H2. Note that is a 1:1 conversion. Then convert mols Zn to L. 1 mol ...
Wednesday, February 12, 2014 at 11:28pm by DrBob222

chemistry
1 mol Zn = 1 mol H2. mols Zn = grams/molar mass = ? mols H2 = mols Zn volume H2 @ STP = mols x 22.4L/mol = ?
Saturday, April 13, 2013 at 11:38pm by DrBob222

chemistry
Zinc metal reacts with hydrochloric acid (HCl) according to the equation: Zn(s)+HCl(aq)=ZnCl2(aq)=H2(g) How many grams of H2 are produced if 100 grams of zinc reacts?
Monday, April 12, 2010 at 4:58am by Duaine

chemistry
None if you don't put it with something that will produce H2. I assume it is an acid. 1 mol Zn will produce 1 mole H2. 25.0 g Zn = ?? moles. moles = grams/molar mass. Then substitute moles Zn you found for n in PV = nRT. Don't forget to use Kelvin for T.
Monday, April 19, 2010 at 4:22pm by DrBob222

chemistry
How many milliliters of a 0.5 molar HCl solution are needed to react completely with 11 grams of zinc according to the following equation? ? HCl + ? Zn ! ? ZnCl2 + ? H2 Answer in units of mL
Wednesday, September 19, 2012 at 4:41pm by cheri

Chemistry
The reaction is exothermic because heat is evolved. mols Zn = grams/atomic mass = ? mols acid = M x L = ? Zn + HCl ==> ZnCl2 + H2 You balance. The reagent in excess is not the limiting reagent. q = mass H2O x specific heat H2O x delta T. h) dH = q Note that this is in J/rxn...
Monday, March 24, 2014 at 9:20pm by DrBob222

Chemistry
Label each of the following reactions as exothermic or endothermic ("exo" or "endo"), and according to whether work is done on or by the system, or no work is done at all ("on", "by" or "none")? Note that no "endo-on" cases appear here, as these are always thermodynamically ...
Sunday, November 22, 2009 at 7:14pm by victor

chemistry
You have competing reactions. Zn + acid ==> Zn^+ + H2(g) Zn also will reduce I^- to I2.
Monday, June 21, 2010 at 2:49pm by DrBob222

AP Chemistry
How many milliliters of a 0.9 molar HCl solution are needed to react completely with 15 grams of zinc according to the following equation? ? HCl + ? Zn → ? ZnCl2 + ? H2 Answer in units of m
Monday, October 3, 2011 at 9:19pm by Yolanda

chemistry
How many milliliters of a 0.5 molar HCl solution are needed to react completely with 15 grams of zinc according to the following equation? ? HCl+? Zn→? ZnCl2 +? H2 Answer in units of mL
Monday, October 28, 2013 at 8:00pm by Anonymous

chemistry
How many milliliters of a 0.5 molar HCl solution are needed to react completely with 15 grams of zinc according to the following equation? ? HCl+? Zn→? ZnCl2 +? H2 Answer in units of mL
Monday, October 28, 2013 at 8:00pm by Anonymous

Chemistry
The cell reaction is Zn + 2H^+ ==> Zn^2+ + H2 Calculate Ecell = 0.76v + 0 = 0.76v. Then Ecell = Eocell + (0.05916/2)*log(Q) whee Q = (pH2)*(Zn^2+)/(H^+)^2(Zn)(s) I assume this is done at STP so pH2 = 1.00 atm and (Zn)(s) = 1.00 by definition. Plug in H^+ and Zn^2+ and solve...
Sunday, June 19, 2011 at 10:23pm by DrBob222

Mass-mass
To Rob and Chopsticks. Correct answer of 1.54 g H2 produced. Long way to get there. First, Zn is the limiting reagent because there is no amount of H3PO4 given. Limiting reagent problems are those where BOTH reactants are given; then one must find the limiting reagent. Where ...
Monday, March 30, 2009 at 6:36pm by DrBob222

ap chemistry please BOB HELP ME
You need to determine the percent composition of Zn in ZnCl2 based on atomic masses and the formula. Then, you can get the grams of Zn recovered.
Sunday, September 9, 2007 at 8:00pm by bobpursley

DR.BOB HELP CHEMISTRY!
How many milliliters of a 0.3 molar HCl solution are needed to react completely with 8 grams of zinc according to the following equation? ? HCl + ? Zn → ? ZnCl2 + ? H2 Answer in units of mL
Tuesday, October 4, 2011 at 8:09pm by Rara

chemistry
how many mililiters of a 0.27 M HCl solution are needed to react completely with 2.7 g of zinc to form zinc (II) chloride?" equation. 2 HCl + 1 Zn -----> 1 ZnCl2 + 1 H2
Monday, July 12, 2010 at 11:49pm by Nicole

AP Chemistry
A mixture of aluminum and zinc metal is used in 2 experiments described below: A- A 1.7 gram sample of the mixture is reacted with excess hydrochloric acid and the resulting hydrogen gas is collected over water. The reaction takes place at 750 mm Hg atmospheric pressure and ...
Sunday, April 3, 2011 at 4:43pm by Kate

Science
how many mililiters of a 0.4 molar HCl solution are needed to react completely with 13 grams of zinc according to the following equation? Equation. 2 HCl + 1 Zn -----> 1 ZnCl2 + 1 H2
Tuesday, July 13, 2010 at 1:54am by Nicole

Chemistry
how many mililiters of a 0.4 molar HCl solution are needed to react completely with 13 grams of zinc according to the following equation? Equation. 2 HCl + 1 Zn -----> 1 ZnCl2 + 1 H2
Tuesday, July 13, 2010 at 1:54am by Nicole

chem
How many grams of zinc metal will react completely with 8.2 liters of 3.5 M HCl? Show all of the work needed to solve this problem. Zn (s) + 2 HCl (aq) ZnCl2 (aq) + H2 (g)
Tuesday, January 17, 2012 at 5:09pm by bryan

chemistry
In basic solution you add OH^- and not H^+. Either will work; e.g., if adding H^+, then you balance the H^+ added with OH^- and it all comes out in the wash. However, answer on the worksheet or not, I don't buy that the half cell is 2e + 2H2O ==> H2 + 2OH^- You didn't say ...
Thursday, November 4, 2010 at 11:49pm by DrBob222

chemistry
Calculate the number of moles of Zn from M=10g/molar mass of Zn calculate molar mass of ZnCl2 mass produced is then M x molar mass of ZnCl2
Monday, November 7, 2011 at 4:52am by Dr Russ

Chemistry
This is a limiting reagent (LR) problem. I know that because amounts for BOTH reactants are given. Zn + H2SO4 ==> H2 + ZnSO4 mols Zn = grams/molar mass mols H2SO4 = grams/molar mass Using the coefficients in the balanced equation, convert mols Zn to mols H2. Do the same for...
Tuesday, November 19, 2013 at 9:40pm by DrBob222

Chemistry
Identify the species oxidized and the species reduced in each of these redox equations A. 3Br2 + 2Ga -> 2GaBr3 B. HCL + Zn -> ZnCl2 + H2 C. Mg + N2 -> Mg3N2
Tuesday, April 6, 2010 at 9:45pm by Anonymous

chemistry
for the reaction ZnO + 2HCl yields ZnCL2 + H2O, what is the maximum amount of ZnCl2 which could be formed from 17.24 grams of ZnO and 6.87 grams of HCl? answer in units of grams.
Wednesday, September 8, 2010 at 7:42pm by Jordyn

AP Chemistry
Small quantities of hydrogen gas can be prepared in the laboratory by the addition of aqueous hydrochloric acid to metallic zinc. Zn(s)+2HCl(aq) -> ZnCl2(aq)+ H2(g) Typically, the hydrogen gas is bubbled through water for collection and becomes saturated with water vapor. ...
Wednesday, November 3, 2010 at 9:51pm by Anonymous

ap chem
for the reaction ZnO + 2HCl yields ZnCL2 + H2O, what is the maximum amount of ZnCl2 which could be formed from 17.24 grams of ZnO and 6.87 grams of HCl? answer in units of grams.
Wednesday, September 8, 2010 at 7:58pm by chris

Chemistry
How did you do the HCl part? Something like this? mols Zn = g/molar mass = 4.30/65.37 = 0.06578 Then convert mols Zn to mols HCl using the coefficients in the balanced equation. mols HCl = 0.06578 x(2 mols HCl/1 mol Zn) = 0.06578 x 2 = 0.1316 Then convert mols HCl to grams. ...
Sunday, October 21, 2007 at 3:46pm by DrBob222

Chemistry
A 0.4584 g sample of impure zinc chloride, ZnCl2, FW = 136.3 g/mole, was dissolved in water and excess silver nitrate was added to the solution. The mass of the dry silver chloride, AgCl, FW = 143.3 g/mole, produced was 0.8564 g. The balanced precipitation is: ZnCl2 (aq) + 2 ...
Sunday, October 16, 2011 at 10:06pm by DrBob222

Chem
I don't know at what level you are but there are several ways to leave this equation. I will assume you know a little about complex ions. Zn(s) + 2H2O(l) + 2 OH^-(aq) ==> H2(g) + Zn(OH)4^-2(aq) If you wish a molecular equation, Zn(s) + 2NaOH(g) ==> H2(g) + Na2ZnO2(aq) ...
Monday, November 12, 2007 at 12:32am by DrBob222

Chemistry
I'm about to do the second part of a Limiting Reagent laboratory tomorrow. There are a few questions that are giving me trouble on the pre-lab assignment. In the first lab period, we measured the amount of H2 gas produced in a reaction of Mg and 10 mL of 2.0 M HCl. We varied ...
Wednesday, March 11, 2009 at 11:17pm by Jake

Organic Chemistry
An osmolarity of 0.3 osm = 0.1M ZnCl2 (since there are three particles in a molecule of ZnCl2). You wnat how many mole? That is M x L = ? The moles ZnCl2 = grams ZnCl2/molar mass.
Tuesday, March 6, 2012 at 8:51pm by DrBob222

chemistry
Convert 3.63 g Zn to mols. mols = grams/molar mass. Use the equation coefficients to convert mols Zn to mols ZnCl2. Convert mols ZnCl2 to g. g = mols x molar mass.
Tuesday, May 22, 2012 at 11:23pm by DrBob222

chemisty
what is the molarity of ZnCl2 that forms when 30.0 g of zinc completely reacts with CuCl2 according to the following reaction? Assume a final volume of 285 mL. Zn(s) + CuCl2(aq)--> ZnCl2(aq) + Cu(s)
Saturday, November 20, 2010 at 2:18pm by melissa

chemistry
A student generates H2(g) over water using the reaction between zinc and hydrochloric acid Zn(s)+ 2HCl(aq)---> ZnCl2(aq)+ H2(g) Data: Mass of vial and zinc 15.5082 mass of vial 15.3972 mass of zinc 0.111 final burette reading 45.30mL barometric pressure: Patm 100.6kPa ...
Wednesday, November 23, 2011 at 8:50pm by Yuli

college chem
What is the molarity of ZnCl2 that forms when 25.0g of zinc completely reacts with CuCl2 according to the following reaction? Assume a final volume of 285mL . Zn(s)+CuCl2(aq)→ZnCl2(aq)+Cu(s)
Thursday, October 8, 2009 at 4:30pm by Anonymous

Chemistry
Balance the equation. Convert 2.5 g Zn to mols. mols = g/molar mass. Using the coefficients in the balanced equation, convert mols Zn to mols H2. Convert mols H2 to volume H2 remembering that mols x 22.4 L/mol at stp = L. Post your work if you get stuck.
Monday, October 1, 2007 at 8:58pm by DrBob222

CHEMistry
mols Zn = grams/molar mass = approximately 0.04 mol (but this is an estimate) and Zn is the limiting reagent. Zn + 2HBr ==> H2 + ZnBr2 qrxn = Ccal x delta T. qrxn/mol = [qrxn/mols Zn] = ?
Wednesday, March 27, 2013 at 1:44pm by DrBob222

chemistry
What is the molarity of ZnCl2 that forms when 30.0g of zinc completely reacts with CuCl2 according to the following reaction? Assume a final volume of 285 mL. Zn(s) + CuCl2(aq)--> ZnCl2(aq) + Cu(s) Please Explain!! Thanks!!
Saturday, December 4, 2010 at 12:36am by Jenni

chemistry........help!! =)
What is the molarity of ZnCl2 that forms when 30.0g of zinc completely reacts with CuCl2 according to the following reaction? Assume a final volume of 285 mL. Zn(s) + CuCl2(aq)--> ZnCl2(aq) + Cu(s) Please Explain!! Thanks!!
Monday, December 6, 2010 at 1:22pm by jenni

chemistry
Do you know that Zn is the limiting regent. mols Zn = 5/atomic mass Zn = estimated 0.07 mols Zn produces estimated 0.07 mols H2. Then use PV = nRT and solve for P.
Sunday, April 21, 2013 at 8:34pm by DrBob222

chemistry
Zn is less active than Mg. Write the equations describing what occurs when ou mix: a)Zn with 0.5M magnesium chloride, MgCl2 b)Mg with 0.5M ZnCl2
Thursday, October 28, 2010 at 5:40pm by shannon

Chemistry
Using data from the following reactions and applying Hess's law, calculate the heat change for the slow reaction of zinc with water (answer must be in kJ/mol Zn): Zn(s) + 2 H2O(l) ----> Zn^2+(aq) + 2 OH-(aq) + H2(g) (ΔHrxn = ?) H+(aq) + OH-(aq) ----> H2O(l) (Δ...
Monday, October 15, 2012 at 10:42pm by Amanda

chem
Using data from the following reactions and applying Hess's law, calculate the heat change for the slow reaction of zinc with water (answer must be in kJ/mol Zn): Zn(s) + 2 H2O(l) ----> Zn^2+(aq) + 2 OH-(aq) + H2(g) (ΔHrxn = ?) H+(aq) + OH-(aq) ----> H2O(l) (Δ...
Monday, October 15, 2012 at 10:42pm by doug

chemistry
Using data from the following reactions and applying Hess's law, calculate the heat change for the slow reaction of zinc with water (answer must be in kJ/mol Zn): Zn(s) + 2 H2O(l) ----> Zn^2+(aq) + 2 OH-(aq) + H2(g) (ΔHrxn = ?) H+(aq) + OH-(aq) ----> H2O(l) (Δ...
Tuesday, October 16, 2012 at 12:05am by stephon

Chemistry
1) Balance this redox reaction using the oxidation-number method. Zn + O2 + HCl ® ZnCl2 + H2O 2) Balance this redox reaction using the half-reaction method. (basic solution) Zn + MnO4- ® Zn(OH)2 + MnO2
Wednesday, October 13, 2010 at 4:07pm by Sara

Chemistry
H2 + Cl2 ==> 2HCl mols HCl = 21/molar mass HCl. mols H2 = 1/2 that (from the coefficients in the balanced equation). mols H2 at STP = L/22.4; therefore L H2 = mols H2 x 22.4 L/mol = ?
Sunday, July 21, 2013 at 2:04pm by DrBob222

Chemistry
Your problem is you don't have the correct formula for zinc hydroxide. It should be Zn(OH)2. 2KOH(aq) + ZnCl2(aq) ==> 2KCl(aq) + Zn(OH)2(s) You can put in the aq (and s) on the total ionic equation but here it is. 2K^+ + 2OH^- + Zn^+2 + 2Cl^- ==>2K^+ + 2Cl^- + Zn(OH)2 ...
Wednesday, November 10, 2010 at 4:12pm by DrBob222

chemistry
Given the following chemical reaction: Zn+HCl-->ZnCl2+H2(g) If you measured the total volume of collected gas over water at 20 degrees celcius t be 428ml at a total pressure of 845 torr, how many milliliters of 2.6M HCl would be required to produce the correct amount of ...
Saturday, December 4, 2010 at 11:26pm by regina

chemistry
What is the redox equation you are trying to find the half reactions for? Your entire question is confusing because of the "it might be this, but" and "or it might be this, but..." If you can clean up the question I can help. The correct final equation, which you have written ...
Thursday, November 4, 2010 at 11:49pm by DrBob222

chemistry
how to balance ZnO+2HCl yields ZnCl2+H2O
Wednesday, September 8, 2010 at 7:53pm by jason

chemistry
ZnCO3 + 2HCl ==> H2O + CO2 + ZnCl2
Thursday, November 14, 2013 at 6:50am by DrBob222

Chemisty.....Help =))
What is the molarity of ZnCl2 that forms when 30.0g of zinc completely reacts with CuCl2 according to the following reaction? Assume a final volume of 285 mL . (please explain step by step I have no clue!) Zn(s) + CuCl2(aq) --> ZnCl2(aq)+ Cu(s)
Tuesday, December 7, 2010 at 11:05pm by Lisa, Help needed!

Chemistry
I know nothing about chemistry, but am wondering if someone could help me with these. 1) Balance this redox reaction using the oxidation-number method. Zn + O2 + HCl ® ZnCl2 + H2O 2) Balance this redox reaction using the half-reaction method. (basic solution) Zn + MnO4- ® Zn(...
Thursday, October 14, 2010 at 8:21am by Sara

chemistry
Technically, we don't know eqivalents without a reaction but there are three definitions that are usually used. The strict definition for chemistry is that amount of substance that will react with 1 g H2. For your question, the equivalent weight of Zn is the atomic mass of Zn ...
Wednesday, February 12, 2014 at 11:45pm by DrBob222

CHEMISTRY
I am having trouble understanding how to come up with the products for single replacement reactions. Can any one check my work and tell me what i am doing, and also point out if i am missing any rules. 1. KI + Cl2 ---> 2. Fe + HCl ---> 3. Zn + HNO3 ---> For number 1 i...
Wednesday, October 6, 2010 at 11:25pm by Help asap!! plz

science
Al(s) + HCl(aq) AlCl3(aq) + H2(g) Zn(s) + HCl(aq) ZnCl2(aq) + H2(g) Consider the unbalanced equations above. A 0.250 g sample of a mixture of aluminum and zinc metal is reacted with an excess of hydrochloric acid. Both metals react with hydrochloric acid. The sample produces ...
Monday, April 29, 2013 at 5:20pm by samantha

Chemistry
Al(s) + HCl(aq) AlCl3(aq) + H2(g) Zn(s) + HCl(aq) ZnCl2(aq) + H2(g) Consider the unbalanced equations above. A 0.200 g sample of a mixture of aluminum and zinc metal is reacted with an excess of hydrochloric acid. Both metals react with hydrochloric acid. The sample produces ...
Monday, October 7, 2013 at 6:56pm by Connor

chemistry
In the reaction ZnO+2HCl=ZnCl2+H2O what is oxidized and what is reduced?
Tuesday, April 1, 2014 at 12:47pm by amie

chemistry
Mg + ZnCl2 ==> Zn + MgCl2 Zn + MgCl2 ==> no reaction.
Thursday, October 28, 2010 at 5:40pm by DrBob222

Physical Science
Hello, Do I have the right answer? my answer D Thank You, In the chemical equation Zn+2HCL -> ZnCI2 + H2, the reactants are A: zinc chloride and hydrogen B: zinf and hydrogen carbonate C: zinc chlorate and water D: zinc and hydrochloric acid
Thursday, March 6, 2008 at 5:39pm by Mandi

Chemistry
Mg + 2HCl -> MgCl2 +H2 delta H = ? MgO + 2HCl (aq) -> MgCl2+ H2O delta H = ? H2+ 1/2O2 -> H2O delta H = -285.8 kJ Using Hess' Law find both the missing delta H values.
Wednesday, March 28, 2012 at 5:03pm by Hunter

Chemistry
What is the voltage for CuCl2 + Zn ZnCl2 + Cu?
Friday, December 21, 2012 at 10:58am by Anonymous

The strongest reducing agent is the easiest to oxidize. The activity series is Li (not Li^+). Zn Sn H2 So Zn is at the top of the list of the elements/ions you have. Zn is the strong reducing agent.
Thursday, May 9, 2013 at 11:46pm by DrBob222

Chemistry
ZnCl2(aq) + 2AgNO3(aq) ==> Zn(NO3)2(aq) + 2AgCl(s) I would assume a convenient volume of each, say 100 mL, then (ZnCl2) = (Zn^+2) = 100mL x 0.140M = 14 mmoles/200 mL = 0.070M Zn ion. (Cl^-) = 2 x 14 = 28 mmoles Cl^- The Ag^+ is trickier because AgCl is insoluble AND you ...
Friday, April 8, 2011 at 9:29am by DrBob222

chem.
If 130.0 g Zn reacts, what mass of ZnCL2 are produced?
Sunday, May 22, 2011 at 9:04pm by mike

chemistry
The ratio of Zn to chlorine is 0.005624/0.0125 = 1:2 ZnCl2 is the formula.
Wednesday, February 17, 2010 at 12:27am by DrBob222

chemistry
Print this out. Remember the process. This is a limiting reagent problem. Step 1. Write the equation and balance it. ZnO + 2HCl --> ZnCl2 + H2O Step 2a. Convert 17.24 g ZnO to moles. moles = grams/molar mass 17.24/81.39 = 0.2118 moles ZnO 2b. Convert 6.87g HCl to moles. 6....
Wednesday, September 8, 2010 at 7:42pm by DrBob222

chemistry
H2 + Cl2 ==> 2HCl 2.4L H2 will produce 2*2.4 = 4.8 L HCl if it has an excess of Cl2. 1.5 L Cl2 will produce 2*1.5 = 3.0 L HCl if it has an excess of H2. This is a limiting reagent problem; I know that because BOTH reactants are given. Therefore, the amount HCl produced will...
Monday, November 1, 2010 at 9:29pm by DrBob222

Chemistry
You have to start with balanced equation.. 2Na+2HCl> 2NaCl + H2 or one mole Na gives 1/2 mole of H2 Sr +2HCl>SrCl2 + H2 so one mole of Sr gives one mole of H2 Now mass let m be the mass m/23 = moles of Na m/38=mole Sr amount of gas: Sr: m/38 Na: m/23 (1/2)=m/46 well, m/...
Thursday, November 12, 2009 at 2:32am by bobpursley

Ap chem question 2 related to the first question
Calculate the volume of gas you would expect to be evolved in X mol of magnesium were reacted with an excess of HCl at standard conditions. I'm going to tell you what my father told me...LOOK IT UP thanks for the unnecessary comment! Mg + 2HCl ==> MgCl2 + H2 1 mol Mg will ...
Sunday, October 22, 2006 at 8:23pm by Justyna

chemistry
Mg + 2HCl ==> H2 + MgCl2 You want 250 cc H2. I assume that's at STP. mols H2 = 250 cc x (1 mol/22,400cc) = ? Convert mols H2 to mols Mg using the coefficients in the balanced equation. ?mol H2 x (1 mol Mg/1 mol H2) =- ? mol H2 x (1/1) = ? mols Mg. Now convert mols Mg to ...
Tuesday, April 17, 2012 at 10:45pm by DrBob222

chemistry
1 g alloy of Cu and Zn reacted with excess of H2SO4 gives 60 ml of H2 at STP. What is the % of Zn in the alloy?
Thursday, August 18, 2011 at 2:20am by abhijit

science
1.) The chemical formula of aluminum oxide is Al2O3. The total mass per mole is 27 + 3*16 = 75 g. Of that mass, 27 g is aluminum atoms. Therefore 27/75 or 36.0% of the mass is aluminum. The answer is therefore 36% of 1000 g. How much is that? 2.) First, let's write down the ...
Saturday, August 27, 2011 at 6:31am by drwls

Chemistry
Here is a fairly complete list of the activity series. As you can see it is simply a listing of metals with the most active at the top and the least active at the bottom. Here's how it works. But first, here is the table. http://www.files.chem.vt.edu/RVGS/ACT /notes/...
Wednesday, March 24, 2010 at 10:22pm by DrBob222

chemistry
This is like the other one I posted about. I have to predict the product. Zinc (s) + sulfuric acid (aq) ----> ____ Please and thank you! This is a single replacement type reaction. Products are ZnSO4 and H2. Same type as Al and HCl. how do you know that H2 is alone instead ...
Tuesday, February 27, 2007 at 7:09pm by Valerie

Ap Chemistry
all correct except for the moles of H2 per mole of Mg. The coefficents tell me that for each one mole of H2, 2 moles of Mg was consumed. 2Mg (s) + 2HCL (l) ----> H2 (g) + 2MgCl (aq)
Tuesday, September 25, 2007 at 4:35pm by bobpursley

Chemistry
The determination of 4.000 mmol of ZnCl2 is performed gravimetrically by the addition of NaCN solution in a Total volume of 200.00ml. Ksp = 3.0X10^-16 for Zn(CN)2. State and verify all assumption. Assume cyanide does not hydrolyze. a. Derive the COC and COM equations for the ...
Saturday, December 22, 2012 at 5:01pm by WILL

Chemistry
I think it helps to draw a picture. ......Zn^2+ + 4NH3 ==> Zn(NH3)4 + E......x......0.3109...0.22 The problem gives the equilibrium conditions; therefore, you need not worry about a reaction. Kf = [Zn(NH3)4}^2+/(Zn^2+)(NH3)^4 (Zn^2+) = x [Zn(NH3)4]^2+ = 0.22M (NH3) = 0.3109...
Monday, March 18, 2013 at 7:49pm by DrBob222

chemistry
Use PV = nRT P = 0.980 - (23.8/760) V = 7.8L n = solve for this R = 0.08206 T = 298 1 mol H2 = 1 mol Zn g Zn = mols x molar mass.
Wednesday, May 2, 2012 at 3:26pm by DrBob222

I now need to find the enthalpies for Mg and MgO and then use the equations Mg(s) + 2HCl(aq) -> MgCl2(aq) + H2(g) MgO(s) + 2HCl(aq) ->MgCl2(aq) + H2O(l) H2(g) + 1/2O2(l) delta H =-241.8 kJ I do not understand how you find the values for the first two equations when there...
Monday, February 13, 2012 at 9:31pm by Hannah

Chemistry
2HCl + Mg ==> MgCl2 + H2 Looks like a single replacement reaction to me. Mg replaced H2.
Monday, November 21, 2011 at 2:01pm by DrBob222

Chemistry
H2+ Cl2>>2HCl for each mole of H2, you get twice that number of moles of HCl.
Wednesday, February 15, 2012 at 4:05pm by bobpursley

chemistry
Consider the reaction Mg +2HCl ------>MgCl2 + H2 What is the minimum amount of 1.85M HCl is necessary to produce 28.5L of H2 at STP Please help me work this problem
Sunday, November 6, 2011 at 9:00pm by swtnblk

Chemistry
mols Zn = grams/molar mass Convert mols Zn to mols H2 susing the coefficients in the balanced equation. Now convert mols H2 to g. g = mols x molar mass.
Monday, March 11, 2013 at 1:41pm by DrBob222

AP Chemistry
I would assume that since an amount for Zn is not given that H2SO4 is the limiting reagent (LR). Zn + H2SO4 ==> ZnSO4 + H2 You have 4.00 x 0.387 = about 1.55 mols H2SO4 which will produce 1.55 mols H2 at STP. (Note that you don't have 1 mol H2 which is the error in your ...
Sunday, October 13, 2013 at 5:29pm by DrBob222

Chemistry
Consider the voltaic cell: Zn(s) / Zn2+(aq) // H+(aq) / H2(g) / Pt(s) Calculate the value of Ecell, in V, when [Zn2+] =1.00 M and [H+] = 0.00100 M DATA: Zn2+(aq) +2 eŻ ---> Zn(s);Eo = - 0.76 V 2 H+(aq) + 2 eŻ ---> H2(g);Eo = 0.00 V
Sunday, June 19, 2011 at 10:23pm by Martin

Chemistry
You have four problems to work here. Mg + 2HCl ==> MgCl2 + H2 mols Mg = grams/molar mass Convert mols Mg to mol H2. mols HCl you have. Convert to mols H2. The SMALLER number of mols will be the correct answer for mols H2 produced. Do the same for flask B. The flask that ...
Sunday, February 10, 2013 at 4:30pm by DrBob222

chemistry 1
if 20.2g of zn react with and equal amount of magnesium chloride to form magnesium and zinc chloride[zn+mgcl2> mg+zncl2] a.what is the limiting reactant? b. how much magnesium will be produced? Here is the way to solve most of these stoichiometry problems. Step 1. Write the...
Friday, May 11, 2007 at 1:52pm by sam

Chemistry
What is the minimum amount of 1.75 m of HCL necessary to produce 28.5 L of H2 at stp? EQUATION IS AS FOLLOWS: Mg+2HCL->>MgCl2+H2
Wednesday, November 17, 2010 at 7:14pm by Ricardo

chemistry
I can't decipher the funny symbols. I assume you meant to write Mg + 2HCl ==> H2 + MgCl2. mols HCl = M x L = 3.0 x 0.250 = ? mols H2 = 1/2 that (from the coefficients)
Thursday, February 21, 2013 at 3:35pm by DrBob222

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