Sunday
April 26, 2015

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

Chemistry
At 20 degrees celcius the vapor pressure of toluene is 22 mmhg and that of benzene is 75 mmhg. Assume an ideal solution, equimolar in benzene and toluene. At 20 degrees celcius what is the mole fraction of benzene in the vapor in equilibrium with this solution? If you use pv=...
Tuesday, April 7, 2015 at 9:45pm

chemistry
If you start with 146 g of water at 47◦C, how much heat must you add to convert all the liquid into vapor at 100◦C? Assume no heat is lost to the surroundings. Answer in units of kJ.
Tuesday, April 7, 2015 at 9:44pm

Applied Chemistry - HELP!
Make a poster of types of product warning labels. I'm having a hard time looking up types of product warning labels. Please help and please do not just give me Google link to product label for me to look up by myself which I did but I .... having a hard time.
Tuesday, April 7, 2015 at 9:15pm

Chemistry
I don't understand this one at all. Please help! For the equation: MnO2 (s) + 2 CO (g) → Mn (s) + 2 CO2 (g) 1. Calculate ΔG° at 25°C 2. Calculate ΔG° at 125°C
Tuesday, April 7, 2015 at 8:35pm

Chemistry
24.0 mL of a 2.4 M silver nitrate is mixed with 32.0 mL of 2.0 M sodium. Calculate the mass of precipitae formed. Calculate the concentration of all ions remaining in solution after the precipitate forms. I don't know how to start this or where to go with it...
Tuesday, April 7, 2015 at 8:30pm

chemistry
16.5 mL of 2.5 M sodium sulfate is mixed with 35.5 mL of 4.5 M sodium nitrate. What is the concentration of all ions in the new solution?
Tuesday, April 7, 2015 at 8:27pm

Analytical Chemistry
Serum taken from a patient being treated with lithium for manic-depressive illness was analyzed for lithium concentration. A reading of 3.00xE2 units was obtained for the intensity of the 671 nM red emission line. Then 1.00 mL of a 11.8 mM Lithium standard was added to 9.00 mL...
Tuesday, April 7, 2015 at 8:15pm

Chemistry
Calculate the vapor pressure of Hg at 14 oC (in atm). Hg(l) ↔ Hg(g) . . . ΔHo = 61.32 kJ and ΔSo = 98.83 J/K
Tuesday, April 7, 2015 at 7:56pm

Chemistry
Calculate the average C—C bond strength in cyclopropane (in kJ/mol). Its combustion and the experimental enthalpy of reaction are: C3H6(g) + 4.5O2(g) → 3CO2(g) + 3H2O(g) ΔHºrxn = -1,957.7 kJ/mol Since all reactants and products are in the gaseous state, ...
Tuesday, April 7, 2015 at 7:56pm

chemistry
Find (triangle)H for N2H4 + CH4O > C2HO + N2 + 3H2 2NH3 > N2H4 + H2 22.5 kJ 2NH3 > N2 + 3H2 57.5 kJ CH20 + H2 > CH4O 81.2 kJ
Tuesday, April 7, 2015 at 7:04pm

Chemistry
What is the molarity of a solution containing 10.g of NaOH in 700.mL of NaOH solution? Express your answer to two significant figures and include the appropriate units.
Tuesday, April 7, 2015 at 7:00pm

Chemistry
Determine the volume, in milliliters, required to prepare each of the following diluted solutions. 40.0mL of a 2.75M KNO3 solution using a 1.00M KNO3 solution 45.0mL of a 2.90M H2SO4 solution using a 6.00M H2SO4 solution 0.700L of a 2.10M NH4Cl solution using a 5.00M NH4Cl ...
Tuesday, April 7, 2015 at 7:00pm

Chemistry
Calculate the molarity (M) of the following solutions: 4.00moles of glucose in 3.00L of glucose solution 5.50g of KOH in 4.00L of KOH solution 5.85g of NaCl in 400.mL of NaCl solution
Tuesday, April 7, 2015 at 6:58pm

Chemistry
Calculate ΔG (in kJ) at 298 K for some solid ZnF2, 0.055 M Zn2+ and 0.063 M F-(aq). I found Q to be 2.18e-4, then i implemented it into the equation deltaG=RT(lnQ). I got -20.89, but the answer is -12.2.
Tuesday, April 7, 2015 at 5:10pm

chemistry
What must be true for a substance to dissolve in water? A. The entropy term must be positive. B. The enthalpy and entropy terms must combine for a favored reaction. C. The free energy change of dissolving must be positive. D. The energy required to break bonds apart must be ...
Tuesday, April 7, 2015 at 4:16pm

Chemistry
An aqueous solution of 0.25 M silver nitrate, AgNO3, and 0.25 M iron(II) nitrate, Fe(NO3)2, are allowed to come to equilibrium in the following chemical reaction:
Ag+(aq) + Fe2+(aq) Fe3 + (aq) + Ag(s)
If the equilibrium constant, Kc, for the reaction is 3.0 ×...
Tuesday, April 7, 2015 at 4:13pm

Chemistry
If you have 225 grams of Ca3(PO4)2, and 185g H3PO4; calculate which is the limiting reagent, which the XS reagent, and how much product you will produce from the limiting reagent (in grams) Ca(PO4)2 + 4H3PO4 = 3Ca(H2PO4)2
Tuesday, April 7, 2015 at 3:57pm

Chemistry
If you need to produce 355 grams of oxygen gas (O2) in the electrolysis reaction of water by an electric current. If the reaction is run at 125 degrees Celsius in a reactor volume 22500ml. What is the pressure of the produced oxygen in mm Hg?
Tuesday, April 7, 2015 at 3:12pm

Chemistry
If you have a 1255ml of a 10.55 M solution of HCl and you need to dilute the solution to 1.555 M solution; How much solvent must you add?
Tuesday, April 7, 2015 at 2:59pm

Chemistry
In a 25.8 liter vessel of nitrogen gas that is heated from 10 degrees Celsius to 110 degrees Celsius to reach a final pressure of 17450 mm Hg; how many grams of N2 do you have in the vessel?
Tuesday, April 7, 2015 at 2:58pm

Chemistry
What are the correct and accurate products for the following ion combination reaction? Then write the ionic form of the reaction and the net ionic form of the reaction. K2CO3 + CaCl2 ->
Tuesday, April 7, 2015 at 1:44pm

Chemistry
What are the correct and accurate products of the following neutralization reaction. Then write the ionic form of the equation and the net ionic form. KOH + H2SO4 ->
Tuesday, April 7, 2015 at 1:38pm

chemistry cp
The term formula mass is a general term that can be applied to both ionic compounds and molecular compounds because (a) ionic compounds exist as individual molecules (b) molecular formulas are always empirical formulas (c) not all formulas represent individual molecules (d) ...
Tuesday, April 7, 2015 at 12:08pm

Chemistry
1. If two moles of ZnCl2 separate into Zn+ and Cl- ions, how many moles of Zn+ ions are present? 2. How many moles of NO3- are present in one mole of Mg(N03)2? The answers to both of these are 1 mole, right?
Tuesday, April 7, 2015 at 12:06pm

Chemistry
What is the mass in grams of 6.5 moles of water? could you show me how you get the answer to
Tuesday, April 7, 2015 at 11:46am

Chemistry
C18H32O2 + 2H2 - C18H3602; oxidized or reduced?
Tuesday, April 7, 2015 at 9:56am

chemistry
Describe the following types of corrosion and give a practical example of each 1.pure chemical corrosion 2.pure electrochemical corrosion
Tuesday, April 7, 2015 at 9:46am

Chemistry
What is the volume, in milliliters, required to prepare a. 20.0 mL of a 0.250 M KNO3 solution using a 6.00 M KNO3 solution b. 25.0 mL of a 2.50 M H2SO4 solution using a 12.0 M H2SO4 solution c. 0.500 L of a 1.50 M NH4Cl solution using a 10.00 M NH4Cl solution
Monday, April 6, 2015 at 10:50pm

Chemistry
Sodium vapor lamps are often used in residential street lighting. Sodium gives off two yellow lines of light having frequencies of 5.09 × 1014 Hz and 5.08 × 1014 Hz. What is this wavelengths of light in nm? would I start by using the following formula ƛ=c/v &#...
Monday, April 6, 2015 at 10:44pm

Chemistry
The Ka for the reaction of acetic acid and water is 1.8 x 10-5. Which of the following statements is true at pH 7? A.) there is much more acetic acid than acetate ion B.) there is more acetate ion than acetic acid C.) the concentration of acetate ion is equal to that of acetic...
Monday, April 6, 2015 at 10:05pm

Chemistry
The ethylammonium ion, CH3CH2NH3+, has a pKa of 10.81. It reacts with water to form ethylamine, CH3CH2NH2 and H3O+. Which of the following statements is true at pH 7? A.) ethylamine predominates B.) ethylammonium ion predominates C.) the pH is higher than pKa of the ...
Monday, April 6, 2015 at 10:03pm

Chemistry
If you have 324 grams KBr and want to produce a 1.48 M solution in water how many grams of water are needed?
Monday, April 6, 2015 at 9:51pm

Chemistry
Can anyone help me identify the solute and solvent in each solution with the steps if possible? Thanks! a. 10mL of acetic acid and 200mL of water b. 100.0g of water and 5.0g of sugar c. 1.0mL of Br2 and 50.0mL of methylene chloride
Monday, April 6, 2015 at 9:26pm

Chemistry (isotonicity)
How many milligrams of NaCl should be used to make the following prescription isotonic? Dextrose anhydrous 2.5% Sodium chloride q.s. Sterile water for injection Ad 1L There is only dextrose anhydrous 5% available
Monday, April 6, 2015 at 9:11pm

chemistry
a container with an initial volume of 6 liters at a temperature of 30 degrees celsius with a pressure of 2atm is changed so the temperature is now 90 degrees celsius and the volume is 8 liters. calculate the new pressure
Monday, April 6, 2015 at 8:55pm

Chemistry
How many grams of AlNO3 could be used to make the following prescription isotonic? Sol.Silver Nitrate 2.5% Sodium chloride q.s. Sterile water for injection There is only anhydrous dextrose 5% available
Monday, April 6, 2015 at 8:12pm

chemistry
calculate the density of NH3 gas at s.t.p.
Monday, April 6, 2015 at 8:04pm

Chemistry
A 25.00 mL sample of HCl was titrated with 35.79 mL of 0.250 M KOH. The concentration of the HCl solution is:
Monday, April 6, 2015 at 7:47pm

Chemistry
Consider the reaction between acetylene, C2H2, and oxygen in a welding torch: If 5.4 moles of acetylene react with sufficient oxygen, how many grams of CO2 will be formed?
Monday, April 6, 2015 at 1:20pm

Chemistry
Calculate the solubility of Ag2CrO4 in a) 0.05M KClO4 b) 0.005M AgNO3 a) I have figured out: Ag2CrO4=2Ag- + CrO42- Ksp=1.12*10^-12. Ksp=[2Ag]^2*[CrO4] Ksp=(2x)^2(x) = 1.12*10^-12=4x^3= x=2.65*10^-5 (?) b)Ag2CrO4=2Ag- + CrO42- Ksp=1.12*10^-12. Ksp=(2[Ag-]+0.005M)^2*[CrO42-] 1....
Monday, April 6, 2015 at 1:07pm

chemistry
how would you prove that sodium hydroxide is a base without wing litmus paper?
Monday, April 6, 2015 at 12:49pm

Chemistry
Instead of using ratios for back titrations we can also use molarities if our solutions are standardized. A 0.188g sample of antacid containing an unknown amount of triprotic base Al(OH)3 was reacted with 25.0mL of 0.101M HCl. The resulting solution was then titrated with 10....
Monday, April 6, 2015 at 11:00am

Chemistry
0.688g of antacid was treated with 50.00ml of 0.200M HCl. The excess acid required 4.21 mL of 1.200 M NaOH for back-titration. What is the neutralizing power of this antacid expressed as mmol of HCl per gram of antacid? I think the answer should be: (50.00ml HCl)(0.200M HCl)= ...
Monday, April 6, 2015 at 10:25am

chemistry
The Kw of water varies with temperature. Calculate the pH of water at 46⁰C with a Kw = 1.219 x 10-14. Show all calculations leading to an answer.
Monday, April 6, 2015 at 12:14am

chemistry
If 5.40 kcal of heat is added to 1.00 kg of ice at 0⁰C, how much liquid water at 0⁰C is produced? Show all calculations leading to an answer.
Monday, April 6, 2015 at 12:13am

chemistry
When a 2.5 mol of sugar (C12H22O11) are added to a certain amount of water the boiling point is raised by 1 Celsius degree. If 2.5 mol of aluminum nitrate is added to the same amount of water, by how much will the boiling point be changed?
Sunday, April 5, 2015 at 11:48pm

chemistry
If 5.40 kcal of heat is added to 1.00 kg of ice at 0⁰C, how much liquid water at 0⁰C is produced?
Sunday, April 5, 2015 at 11:47pm

chemistry
The Kw of water varies with temperature. Calculate the pH of water at 46⁰C with a Kw = 1.219 x 10-14.
Sunday, April 5, 2015 at 11:46pm

chemistry
what is the rate law for NO+O3=NO2+O2 in second order reaction if [NO] Doubled
Sunday, April 5, 2015 at 10:15pm

chemistry
Why is the second derivative of a titration curve more accurate method to determine endpoints and equivalence points than the first derivative?
Sunday, April 5, 2015 at 5:44pm

chemistry
1)Which of the following single bonds has the greatest bond energy? B-F B-Cl B-I B-Br 2)What is the % ionicity of the bond you chose above? (answer in full percent, not a fraction) 3)What is the % ionicity of the weakest single bond above? (answer in full percent, not a ...
Sunday, April 5, 2015 at 12:20pm

chemistry
A thermally activated process (a reaction) takes four minutes at 816oC. How long will it take (in minutes) at 707oC if the activation energy is 150 kJ/mol? What is the % ionicity of the bond B_I&B_F?
Sunday, April 5, 2015 at 10:11am

Chemistry
The bubble in the tip of the buret is not removed prior to performing the NaOH standardization. Will the reported concentration of the NaOH be greater than, less than, or equal to the true concentration of the NaOH if the bubble is flushed from the buret during the titration? ...
Saturday, April 4, 2015 at 10:35pm

Chemistry
A 5.00 L flask with mass of 463.873 g is filled with Ar gas to 3 atm pressure at 292 k. (19 celsius + 273) what is the mass of flask and gas?
Saturday, April 4, 2015 at 8:23pm

chemistry
A 100 w lightbulb is place in a cylinder equipped with a moveable piston. The ligshtbulb is turned on for 0.015 hours, and the assembly expands from initial volume of 0.85 L to a final volume of 5.88 L against an external pressure of 1.0 atm. Use the wattage of the lightbulb ...
Saturday, April 4, 2015 at 4:55pm

chemistry
Uranium metal can be produced by reaction of uranium tetrafluoride (UF4) with calcium metal (Ca). The by-product of this reaction is calcium fluoride (CaF2). The reactor is charged with 292.0 kg of UF4 and 47.0 kg of calcium. Assume that the reaction goes to completion. The ...
Saturday, April 4, 2015 at 4:35pm

chemistry
Don't know where to begin. 1) A thermally activated process (a reaction) takes four minutes at 811°C. How long will it take (in minutes) at 748°C if the activation energy is 150 kJ/mol?
Saturday, April 4, 2015 at 3:20pm

Chemistry
am I doing this equation correctly, please help. K3PO4(aq) + Ba(NO3)2(aq) my answer: 3K(NO3)2(aq) + 2Ba(PO4)3(s) Double displacement precipitation
Saturday, April 4, 2015 at 3:17pm

chemistry
The volume of CO2 produced by the combustion of 20g of graphite containing 10% impurity will be?
Saturday, April 4, 2015 at 2:33pm

Chemistry
Consider the following equilibrium: At equilibrium, 4.0 × 10-2mol H2, 4.0 × 10-2mol CO, 1.0 × 10-2mol H2O and 1.0 × 10-2mol C were present in a 1.0L container. What is the value of Keq? a) 0.063 b) 16 c) 0.16 d) 6.3 I got b, but I'm not too certain ...
Saturday, April 4, 2015 at 1:52am

Chemistry
Hi, can you help with how to solve this equation? 50.0 gram sample of NaCl is added to water to create a 0.50 L solution. What volume of this solution is needed to create a 1.30 L solution that is 0.100 M NaCl? The choices provided: a) 152 mL b) 255 mL c) 87.6 mL d) 412 mL 10....
Friday, April 3, 2015 at 9:59pm

chemistry ap
Assume that 29.7 g of Al react with HCl according to the equation Al(s) + HCl(aq) −→ AlCl3(aq) + H2(g) at STP. How many moles of Al react? Remember to balance the equation first. Answer in units of mol. How many moles of H2 are produced? Answer in units of mol. How...
Friday, April 3, 2015 at 9:51pm

chemistry
Solid iron(III) hydroxide decomposes to produce iron(III) oxide and water vapor. 1.09 L of water vapor is produced at STP. How much iron(III) hydroxide was used? in g.
Friday, April 3, 2015 at 9:50pm

chemistry ap
20.0 L of methane (CH4) undergoes complete combustion at 0.961 atm and 20◦C. How much CO2 is formed? Answer in units of L.
Friday, April 3, 2015 at 9:16pm

chemistry ap
Nitric acid can be produced by the reaction of gaseous nitrogen dioxide with water. 3 NO2(g) + H2O(ℓ) −→ 2 HNO3(ℓ) + NO(g) If 734 L of NO2 gas react with water, what volume of NO gas will be produced? Assume the gases are measured under the same ...
Friday, April 3, 2015 at 9:16pm

chemistry
3.58 gram sample of an unknown gas is found to occupy a volume of 2.37 L at a pressure of 808 mm Hg and a temperature of 60 oC. What is the molecular weight?
Friday, April 3, 2015 at 8:44pm

chemistry ap
Assuming all volume measurements are made at the same temperature and pressure, what volume of hydrogen gas is needed to react completely with 3.25 L of oxygen gas to produce water vapor? Answer in units of L.
Friday, April 3, 2015 at 7:51pm

chemistry ap
Zinc reacts with 18.0 mL of 6.00 M cold, aqueous sulfuric acid through single replacement. a. How much zinc sulfate is produced? Answer in units of g
Friday, April 3, 2015 at 7:50pm

chemistry
determine the concentration of NH3(aq) that is required to dissolve 775 mg of AgCl(s) in 100.0 mL of solution. The Ksp of AgCl is 1.77× 10–10.] please help!!!!!!!
Friday, April 3, 2015 at 6:46pm

chemistry
How many particles are there in a mole of nitrogen dioxide molecules? How many total atoms are there in a mole of nitrogen dioxide molecules?How many nitrogen atoms? How many oxygen atoms?
Friday, April 3, 2015 at 2:45pm

Chemistry
Can someone help me with this question? Calculate the work for each of the following processes beginning with a gas sample in a piston assembly with T=305 K, P=1.79 atm, and V=4.29 (a) irreversible expensing against a constant external pressure of 1.00 atm to a final volume of...
Friday, April 3, 2015 at 1:56pm

chemistry
A 50.0 mL sample of 0.50 M HBr is titrated with 0.25 M KOH. What is the pH after the addition of 60.0 mL of KOH? A) 4.1 B) 13.4 C) 1.7 D) 2.0 E) 7.7 I'm confused on the process of solving this problem. My work so far: .050L X .50 mol/1L= .025 mol HBR .060L X .25 mol/1L= ....
Friday, April 3, 2015 at 12:40pm

chemistry
Estimate the pH of the solution that results when this added to 50 mL of 0.275 M Na2HPO4(aq) - 50 mL of 0.275 M HCl(aq)
Friday, April 3, 2015 at 11:59am

chemistry
Hello! I am struggling a bit with this problem A gas sample occupies 51.6 L at a pressure of 0.841 atm and 39.6 ºC. What is the amount of gas (mol) in this sample?
Friday, April 3, 2015 at 11:57am

chemistry
Given the equation Ag^+(aq) + 2NH3 (aq) -> [Ag(NH3)2]^+ (aq) kf= 2 x 10^7 determine the concentration of NH3(aq) that is required to dissolve 415 mg of AgCl(s) in 100.0 mL of solution. The Ksp of AgCl is 1.77× 10–10.
Friday, April 3, 2015 at 11:54am

Chemistry
Instead of using ratios for back titrations we can also use molarities if our solutions are standardized. A 0.188g sample of antacid containing an unknown amount of triprotic base Al(OH)3 was reacted with 25.0mL of 0.101M HCl. The resulting solution was then titrated with 10....
Friday, April 3, 2015 at 10:58am

chemistry
How many grams of solid ammonium chloride should be added to 1.50 L of a 0.224 M ammonia solution to prepare a buffer with a pH of 8.720 ?
Friday, April 3, 2015 at 10:47am

chemistry
If a solution is made 0.080 M in Mg(NO3)2, 0.075 M in aqueous ammonia, and 3.5 M in NH4NO3, will Mg(OH)2 precipitate? What is the pH of this solution?
Friday, April 3, 2015 at 12:07am

Chemistry
Given the equation Ag^+(aq) + 2NH3 (aq) -> [Ag(NH3)2]^+ (aq) kf= 2 x 10^7 determine the concentration of NH3(aq) that is required to dissolve 415 mg of AgCl(s) in 100.0 mL of solution. The Ksp of AgCl is 1.77× 10–10.
Thursday, April 2, 2015 at 11:43pm

chemistry
what volume of a 0.247 M perchloric acid solution is required to neutralize 23.8 mL of a 0.156 M calcium hydroxide solution? _titration problem of acids/bases
Thursday, April 2, 2015 at 11:07pm

chemistry
How many molecules (not moles) of NH3 are produced from 3.55×10−4g of H2?
Thursday, April 2, 2015 at 10:10pm

chemistry
How many grams of H2 are needed to produce 12.22g of NH3?
Thursday, April 2, 2015 at 10:09pm

Chemistry
I am trying to solve a buffer problem. I know I need to use the Henderson-Hasselblach equation but I am not getting the correct answer. The problem is: Propionic acid is a weak monoprotic acid with Ka = 1.3×10-5 M. NaOH(s) was gradually added to 1.00 L of 1.29×10-2...
Thursday, April 2, 2015 at 9:11pm

Chemistry
Calculate the value of ΔS when 1.10mol of Br2(l) is vaporized at 58.8 ∘C
Thursday, April 2, 2015 at 6:43pm

Chemistry
When 85g of CH4 are mixed with 85g of O2 according to this equation: CH4 + 2O2 - cO2 + 2H2O What is the theoretical yield in gams of CO2? What is the percent yield if 45.7g of CO2 are produced? Please explain!
Thursday, April 2, 2015 at 4:50pm

Chemistry
the rate of diffusion of a gas having molecular weight just double of hydrogen gas is 30 ml/s.the rate of diffusion of hydrogen gas will be
Thursday, April 2, 2015 at 4:34pm

Chemistry
What is a balanced equation for a Base-Acid Titration?
Thursday, April 2, 2015 at 4:30pm

chemistry
17. Calculate H for the following reaction using Hess law H2 (g) + Br2 (g) → 2 HBr (g) Experimental information 2 H+ → H2 H -436.4 kJ 2 Br- → Br2 H -192.5 kJ 2 H+ + 2 Br- →2 HBr H -144.8 kJ
Thursday, April 2, 2015 at 4:06pm

Chemistry
Why can't milk of magnesia (Mg(OH)2), act as a buffer?
Thursday, April 2, 2015 at 2:25pm

Chemistry
The ph of a solution is 9.55 at 25degree celcius. What is the hydroxide-ion in the solution?
Thursday, April 2, 2015 at 12:16pm

Chemistry
For the reaction 4FeCl2(aq) + 3O2(g) - 2Fe2O3(s) + 4Cl2(g); how many grams of FeO3 are produced from 8.71 x 10 to the 21st power molecules of O2?? Help Please!
Thursday, April 2, 2015 at 11:04am

chemistry
Why do you add Sodium hydroxidein your reduction procedure
Thursday, April 2, 2015 at 7:59am

chemistry
assuming only glassware was supplied for the original experiment, what would be the procedural change necessary to titrate 25.00mL of commercial bleaching solution.
Thursday, April 2, 2015 at 5:37am

chemistry
You weigh out an antacid tablet and determine the mass to be 1.1990 g. After taking a 0.2455 g sample of the antacid tablet, you dissolve it in 25.00 mL of a 0.1006 M solution of hydrochloric acid in a 250.0 mL Erlenmeyer flask. After heating the solution to get rid of carbon ...
Thursday, April 2, 2015 at 12:53am

chemistry
What is the heat involved when 3.00 g of aluminum oxide is formed?
Thursday, April 2, 2015 at 12:20am

chemistry
calculate the grams of 1.8% (m/m) NaCl solution that contains 8.00 g of NaCl I tried 1.8 times 8.00g divided by 58.44g times 100 my answer is 24.6g rounded to 2 SF is 25g this truned out to be wrong I'm stumped!
Wednesday, April 1, 2015 at 10:40pm

chemistry
calculate delta G at 298 K when 5.0 atm H2 and 3.0 atm of CO2 are converted to methanol.
Wednesday, April 1, 2015 at 9:39pm

Chemistry
How many moles of HNO3 are present if 0.116mol of Ba(OH)2 was needed to neutralize the acid solution?
Wednesday, April 1, 2015 at 9:03pm

chemistry
Aqueous hydrobromic acid will react with solid sodium hydroxide to produce aqueous sodium bromide and liquid water . Suppose 4.05 g of hydrobromic acid is mixed with 0.86 g of sodium hydroxide. Calculate the maximum mass of water that could be produced by the chemical reaction...
Wednesday, April 1, 2015 at 9:00pm

Chemistry
High concentration of iron (III) ions, Fe3+, cause hard water. Write a balanced equation to show how iron ions can be removed using sodium carbonate, NaCO3.
Wednesday, April 1, 2015 at 8:43pm

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