03/26/21

How do I find out the moles of gas for Co2 and everything else

3) In the combustion reaction of methane gas : CH4 (g) + O2 (g) --> CO2 (g) + 2 H2O (g)4.0 X 10 exp 23 molecules of CH4 was used. Determine(a) the moles of CO2 produced(b) using your answer in... more
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03/26/21

What is the entropy when 1.38 moles of CCl₂F₂ vaporize at 25°C? [∆H(vap) = 17.2 kJ/mol at 25°C]
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03/26/21

Calculate ∆S° for C₃H₄(g) + 2 H₂(g) → C₃H₈(g).
C3H4(g) = 266.9H2(g) = 130.6C3H8(g) = 269.9
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03/26/21

For the reaction 2 H₂(g) + O₂(g) → 2 H₂O(g), which equation would be used to determine the entropy change?
(2A+B)-2CC - ( A + B)2C - ( 2A+B)2A + B + 2C2C - (A+B)
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03/26/21

homework question
The equilibrium constant for the chemical equationN2(g )+ 3H2(g)↽−−⇀ 2NH3(g) is 𝐾p=0.286 at 257∘C. Calculate the value of 𝐾c or the reaction at 257 ∘C.
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03/26/21

what do i do for this
1. How many calories of heat are required to raise the temperature of 225g of water from 10.5oC to 43.7oC?Use the equation: Q = mcΔT (Cwater= 1.00cal/goC)
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03/26/21

What is the pH of 0.75M solution of C5H5 NHCl? Kb for C5H5N = 1.7*10^ -9
What is the pH of 0.75M solution of C5H5 NHCl?  Kb for C5H5N = 1.7*10^ -9
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03/26/21

What is the Ka of CH3NH3 ^+ at 25^ C? Kb for CH3NH2 =4.4*10^ -4
What is the Ka of CH3NH3 ^+  at 25^ C? Kb for CH3NH2 =4.4*10^ -4
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03/26/21

What is the of 1.07M solution of carbonic acid? K a1 =4.3*10^ -7 K a2 =5.6*10^ -11
What is the of 1.07M solution of carbonic acid? K a1 =4.3*10^ -7 K a2 =5.6*10^ -11
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03/26/21

Amino acids in different pH
Hi!I've got a question that I'm having trouble with solving:How does the dipeptide asp-ser (aspartic acid and serine) look like ata) pH = 1b) pH = 7c) pH = 13Motivate your answersI would appreciate... more
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03/26/21

Heat Absorption

A generic solid, X, has a molar mass of 77.3 g/mol In a constant‑pressure calorimeter, 41.4 g of X is dissolved in 227 g of water at 23.00 °C.X(s)⟶X(aq)X(s)⟶X(aq)The temperature of the resulting... more
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03/26/21

Solubility Rule
Salts containing which of the following ions are generally soluble?a) Silverb) Carbonatec) Sulfided) Nitrate
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03/25/21

If 85.0 grams of iron (cFe=0.46 J/g°C) at 101.1°C is placed in Coffee Cup Calorimeter,

containing 250.0 grams of water at 25.0°C, and both are allowed to come to thermal equilibrium, what will the final temperature be?
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03/25/21

Calculate ∆S° for NH₃(g) + HCl(g) → NH₄Cl(s).
NH3 192.5 J/mol.kHCI 186.7 J/mol.kNH4CI 94.6 J/mol.k
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03/25/21

What is S° for B in the reaction 3 A → 2 B if ∆S°(rxn) =-199.8 J/mol ･ K? [S° (A) = (205.0 J/mol ･K)]
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03/25/21

Consider the reaction: 2HCl(aq) + Ba(OH)2(aq) → BaCl2(aq) + 2H2O(l) ΔH = -118 kJ
a) Calculate the heat (in kJ) released (make sure to use the correct sign in your answer) when 106.7 mL of 0.365 M HCl is mixed with excess Ba(OH)2.b) How many grams of barium hydroxide are... more
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03/25/21

Given the following specific heats, answer the question below:
Metal Specific Heat (J/g°C) Manganese 0.477 Sodium 1.225 Strontium 0.301 Aluminum 0.899 Beryllium 1.823  If the same amount of heat is added to 100.0 g samples of each of the metals,... more
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03/25/21

Energy Released from Oxidation
The oxidation of copper(I) oxide, Cu2O (s), to copper(II) oxide, CuO (s), is an exothermic process.2Cu2O(s) + O2 (g) ----->  4 CuO (s)  ΔH°rxn = -292.0 kJ/molCalculate the energy released as... more
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03/25/21

Given the following specific heats, answer the question below:

  Metal Specific Heat (J/g°C) Manganese 0.477 Sodium 1.225 Strontium 0.301 Aluminum 0.899 Beryllium 1.823 If the same amount of heat is added to 100.0 g samples of each of the metals,... more
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03/25/21

The combustion of one mole of benzene, C6H6, in oxygen releases 3268 kJ of heat. The products of the reaction are carbon dioxide and water.
a) Write the balanced thermochemical equation for the combustion of 1 mole of benzene.b) Is the reaction exothermic or endothermic?c) How much heat (in kJ) is given off when 106.4 g of benzene are... more
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03/25/21

A certain compound is composed only of 0.065 mol of carbon, C, and 0.195 mol of hydrogen, H. The compound is known to have a molar mass of 90.0 g/mol.

Determine the empirical and molecular formula of the compound.
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03/25/21

I don't understand how to start my chemistry problem
okay, so I might be doing something wrong, but I'm not even sure where to start with the 1st problem, but I worked out the second one and just need to know if I got the right answer for it(and what... more
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03/25/21

Hess' Law for the enthalpy change of reaction of the decomposition of sodium bicarbonate

I am currently writing a lab report that is about the Hess' law for the thermal decomposition of sodium hydrogen carbonate to for sodium carbonate. We did this by reacting sodium hydrogen carbonate... more
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03/25/21

Find concentration
What concentration of Cl- results when 871mL of 0.713 M LiCl is mixed with 677 mL of 0.377 M MgCl2?
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03/25/21

At 460 K, ∆G = -12.8 kJ/mol for the reaction 2 A (g) → B (g). If the partial pressures of A and B are 7.20 atm and 0.420 atm respectively, what is ∆G° for this reaction?
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