10/30/17

What is the maximum mass of S8 that can be produced by combining 75.0 g of each reactant? 8SO2+16H2S-->3S8+16H2O
I need help with solving this for some homework that I am doing in my chemistry class. Thank you for the help
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10/30/17

Understanding the "Relationship between number of molecules"
In the Ostwald Process, 4 molecules of ammonia and 5 molecules of oxygen react to produce 4 molecules of nitric oxide and 6 molecules of water.  Which of the following equations correctly models... more
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10/30/17

A barrel contains 39.6 litres of lemon juice.How many cylindrical glasses 16 cm tall and diameter 6 cm can be filled with the juice to a height of 14 cm.
pls mention the steps.
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10/30/17

A 1.5 L container holds 0.50 grams of an unknown gas at a pressure of 0.44 atm and a temperature of 50. C. What is the molar mass of the unknown gas?
 A 1.5 L container holds 0.50 grams of an unknown gas at a pressure of 0.44 atm and a temperature of 50. C. What is the molar mass of the unknown gas?
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10/30/17

Complete solution. Chemistry world problem.
Answer with solution: 500ml of a strong acid at 25 degrees celsius was neutralized with 500 ml with a strong base of 25 degrees celsius. After mixing acid and base, the final temperature attained... more
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10/30/17

a hot metal was added to 40 g of water. Find the heat absorbed by water if its temperature increased from 30 degree C to 40 degree C
Please help and show solution.
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10/29/17

born havers cycle
\calculate the energy on the basis of born -haber cycle on chemistry
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10/29/17

Sack A contains 32.5kg of potatoes and sack b contains 3.7kg more potatoes than sack a. Find the total mass of potatoes in the two sacks.
Header  
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10/28/17

I have found mols of HCl and I have found mols of the unknown Metal (M). What are my next steps?
I have found the mols of the HCl solution and I have found the mols of the unknown M. I divided by the mass to get 53.89g/mol. What I did next was find the mols of NaOH by using the formula... more
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10/28/17

A pipe is leaking at 1.5 cups per day. About how many gallons per week is the pipe leaking? (Hint: 1 gallon = 16 cups)
well i don't really understand the example in my math textbook so i need some examples for the question.
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10/28/17

internal standardisation and external standardisation
What are the similarities and differences between internal standardisation and external standardisation? Explain with reference to a chromatographic technique of your choice, for example HPLC.
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10/28/17

Can you teach me how to solve this Head's Law problem?
Given the following  data, calculate the change  in  enthalpy for this reaction.   2NH3+3N2O==>4N2+3H20 (change in enthalpy-1010kJ)    N2O+3H2===>N2+H4+H2O ( change  in enthalpy... more
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10/27/17

I have tried using the formula PV=nRT but I am still not getting the right answer. What am I doing wrong?
M(s) + HCl(aq) → MCl3 (aq) + H2 (g) If 0.1465 g of metal are reacted with excess HCl and the pressure of the room was 0.837 atm, the volume of the water collected was 239.0 mL, and the temperature... more
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10/27/17

What steps so I need to use to solve this Head's Law problem?
The enthalpy of combustion of solid carbon to form carbon dirs ide is -393.7 kJ/mol carbon, and the enthalpy of combustion carbon monoxide to form carbon dioxide is-283.3 kJ/mol. Use this data to... more
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10/27/17

What is the basis for all living things including plants
help help help help help help help help help help help help help help help help
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10/27/17

Suppose a laboratory has a 38 g sample of polonium-210. The half life of polonium-210 is about 138 days.
(A) how many half-lives of polonium-210 occur in 1104 days? (B) how much polonium-210 is in the sample 1104 days later?   A: 9; 0.07 g   B: 8; 4.75 g C: 8; 0.15 g   D: 8; 2,622 g
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10/26/17

Explain why AL usually makes Al^3+ and not AL^2+ or AL^1+
Explain why AL usually makes Al^3+ and not AL^2+ or AL^1+
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10/26/17

PLEASE ANYONE HELP ME, im so stuck on this question
Compare the pH of a 0.55 mol/L H2SO4(aq) solution with the pH of a 0.55 mol/L of H2SO3(aq). Which solution contains the higher concentration of H3O+(aq) ions? a) Detemine the Kb for the conjugate... more
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10/26/17

What are 3 examples of vapor?
Science question
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10/26/17

Can you help me with this calorimetry problem?
In a coffe cup calorimeter, 50.0mL of 0.100M of AgNO3 and 50mL of 0.100M HCl are mixed to yield the following reaction:   Ag+ (aq)  +  Cl -==> AgCl(s)   The two solutions were initially at... more
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10/26/17

What steps do I need to do to complete this AP chemistry problem?
A 5.00g sample of aluminum pellets (specific heat=0.89 J/g°C) and a 10.00g sample of iron pellets (specific heat 0.45 J/g°C) are heated to 100.0 °C.  The mixture of hot iron and aluminum is then... more
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10/25/17

How do I fill out LOL charts for energy transfer in chemistry?
LOL charts, transfer of energy, quick review for quiz tomorrow
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10/25/17

A 1 liter solution contains 0.452 M hydrofluoric acid and 0.339 M potassium fluoride.
Addition of 0.373 moles of hydroiodic acid will:(Assume that the volume does not change upon the addition of hydroiodic acid.)Raise the pH slightlyLower the pH slightlyRaise the pH by several... more
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10/25/17

A 1.00 liter solution contains 0.42 moles nitrous acid and 0.32 moles sodium nitrite .
If 0.16 moles of nitric acid are added to this system, indicate whether the following statements are true or false. (Assume that the volume does not change upon the addition of nitric acid.) A. The... more
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10/25/17

A 1.00 liter solution contains 0.40 M ammonia and 0.52 M ammonium iodide
If 0.130 moles of barium hydroxide are added to this system, indicate whether the following statements are true or false.(Assume that the volume does not change upon the addition of barium... more
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