10/10/15

You used .5000 g of solid and it required 9.00 mL of 1.00 M HCL to titrate to the endpoint. Determine the number of moles of HCl required in your titration.
This is a post lab question from my chem lab.
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10/08/15

For those reactions that are redox, indicate which elements are reduced.
P4(s) + 10HClO(aq) + 6H2O(l) → 4H3PO4(aq) + 10HCl(aq) Br2(l) + 2K(s) → 2KBr(s) CH3CH2OH(l) + 3O2(g) → 3H2O(l) + 2CO2(g) Express your answers as chemical symbols separated by a commas.
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10/08/15

Which substance is the reducing agent in this reaction?
Which substance is the reducing agent in this reaction?   2Cr(OH)3+3OCl−+4OH−→2CrO4−2+3Cl−+5H2O Express your answer as a chemical formula.
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10/06/15

Which substance is the oxidizing agent in this reaction?
ZnO+C→Zn+CO Express your answer as a chemical formula.
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09/27/15

PLEASE HELP!!!? Percent composition problem?
Silver is reacted with excess mercury (II) chloride, producing a solid silver chloride precipitate. If the actual yield of 25.5 g silver chloride represents a 77 percent yield, how much silver was... more
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09/26/15

Limiting reactant problem, chemistry?
Can you please check my answers?   What is the maximum mass of hydrogen gas that can be produced from 5.70 g SrH2 and 4.75g H2O?    SrH2 (s) + 2H2O (l) -----> Sr(OH)2 (s) + 2H2... more
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09/26/15

Chemistry Percent Yield Problem? Can you please help me?
Silver is reacted with excess mercury (II) chloride, producing a solid silver chloride precipitate. If the actual yield of 25.5 g silver chloride represents a 77% yield, how much silver was... more
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09/23/15

The molar mass of aspirin is 180.16 g/mol. What is the theoretical yield in grams, for the aspirin she theoretically obtained above using 4.02 g of SA?
The molar mass of aspirin is 180.16 g/mol. What is the theoretical yield in grams, for the aspirin she theoretically obtained above using 4.02 g of SA? What is the percent yield?
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09/23/15

The molar mass of salicylic acid (SA) is 138.12 g/mol. How many theoretical mols are there in the 4.02 g of the SA reactant the student started the reaction wit
The molar mass of salicylic acid (SA) is 138.12 g/mol. How many theoretical mols are there in the 4.02 g of the SA reactant the student started the reaction with?
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09/23/15

Determine the formula weights of each of the following compounds.
Nitrous oxide, N2O , known as laughing gas and used as an anesthetic in dentistry.Express your answer to one decimal place. Benzoic acid, HC7H5O2 , a substance used as a food preservative.Express... more
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09/20/15

How much PBr3 is required to react completely with 6.0 mL of ethanol?
this question is related to the balanced equation 3CH3CH2OH + PBr3 ----> 3 CH3CH2Br + H3PO3
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08/11/15

Karla is in Group A, where 56 orange slices are shared equally among 7 people. Jade is in Group B, where 54 orange slices are shared equally among 6 people.
Who had the greater share of orange slices, Karla or Jade   I need these Informations Below: Represent group with a ratio: Write an inequality to represent the answer of the question: Answer... more
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08/11/15

A store sells prepackaged shrimp in 3 sizes. Bag K weighs 4 pounds and costs $15. Bag L weighs 5 pounds and costs $20. Bag M weighs 8 pounds and costs $25.
Which is the best buy? Which is the worst buy?   I need these Informations: Represent group with a ratio: Write an inequality to represent the answer of the question: Answer the question in a... more
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08/03/15

At the equivalence point in a titration involving 1.0 M solutions, which of the following combinations would have the lowest conductivity
A. Nitric acid and barium hydroxide B. Acetic acid and sodium hydroxide C. Sulphuric acid and barium hydroxide D. Hydrochloric acid and sodium hydroxide   I dont understand why the answer is c
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08/02/15

how many grams of solid gold could be oxidized per mole of electrons according to its half reaction?
How many grams of solid gold could be oxidized per mole of electrons according to its half reaction?
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08/01/15

How to calculate purity correction on weighing out a standard?
need to weigh 6 mg with a standard purity of 93%
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07/30/15

Henderson-Hasselbach equation +
1. Use the Henderson-Hasselbach equation to determine the ratio of acid to base in a formic acid-formate buffer with pH=3.00.2. Assume that the human blood buffer includes, at any point, 0.00080 M... more
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07/25/15

Chem question
1.)Potassium nitrate decomposes when heated, forming potassium nitrite and oxygen gas.            a.) Write a balanced chemical equation for this reaction            b.) What mass of KNO3 would... more
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07/25/15

Perform the following conversions
A.) 50.0mL NH3(g) at -20°C and in 75.0 ml of solution to concentration (molarity) B.) Volume (in liters) of a 0.250 M solution that would release 5.25 L of SO3 (g) at STP C.) Volume (in liters)... more
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05/25/15

A chemistry question
What volume (ml) of 23% (m/v) LiCl solution will provide 36 grams of LiCl? Round to one decimal places, do not include units in your answer.
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05/04/15

How many grams of CS2 can be produced from 750 L of SO2 at STP?
We're working on stoichionmerty in chemistry and I am beyond confused. Any help is appreciated, there's more than one problem including the one stated in the title....  -If 3495 g of CS2 is... more
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04/20/15

Given the following data:
Given the following data: MnO(s) + H2(g) Mn(s) + H2O(l), H = 100 kJ MnO2(s) + 2 H2(g) Mn(s) + 2 H2O(l), H = -52 kJ use Hess's law to calculate the heat of the reaction MnO2(s) + H2(g) MnO(s) + H2O(l)
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04/19/15

How to calculate the required concentration for sodium sulfite to remove oxygen as an oxygen scavenger from a solution containing know quantity of oxygen
f I know the amount of dissolved oxygen in such a solution, how can I know the required concentration of sodium sulfite to be used and react as oxygen scavenger?
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04/14/15

Chemistry Equation! Help is much appreciated!
Please answer these equations and show how you got the answer! Thanks! 1. (209.6J/K) = [2mol(213.74 J/molK) + 6mol(S (188.825 J/molK)] – [1mol(219.56 J/molK) + 3mol(x)] 2. ?Grxn = [12mol(-394.359... more
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03/11/15

Please Help! and tell me how you solved it
A student measured out a 15.0 mL aliquot (portion) of juice into an Erlenmeyer flask. She added 3 drops of Phenolphtalein indicator to the solution. It took 27.30 mL of 0.1003 M NaOH to reach the... more
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