03/02/21

What is the mole ratio of aluminum to oxygen gas in the following reaction: 4Al + 3O2 --> 2Al2O3
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03/02/21

What if instead I had 100 mol of C3H8, how many moles of water would I have made?
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03/02/21

When 1 mol of CS2(l) forms from its elements at 1 atm and 25°C, 89.7 kJ is absorbed, and it takes 27.7 kJ to vaporize 1 mol of the liquid. How much heat is absorbed when 1 mol of CS2(g) forms from...
its elements at these conditions? Do not answer in scientific notation.I got 1174 kJ but it is wrong.
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03/02/21

Copper(I) oxide can be oxidized to copper(II) oxide: Cu2O(s) + 1/2 O2(g) → 2 CuO(s).....
ΔH0rxn = -146.0 kJGiven ΔH0f of Cu2O(s) = −168.6 kJ/mol, find ΔH0f of CuO(s)
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03/02/21

Sucrose (C12H22O11, table sugar) is oxidized in the body by O2 via a complex set of reactions that ultimately produces CO2(g) and H2O(l) and releases 5.16 × 103 kJ of heat per mole of sucrose...
(a) Write a balanced thermochemical equation for this reaction. Include the physical state of each reactant and product.Enter your answer for ΔHrxn in scientific notation.(b) Calculate the energy... more
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03/02/21

What is the solubility of Cr(OH)₃ at a pH of 9.70? (Ksp Cr(OH)₃ is 6.70 × 10⁻³¹)
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03/02/21

What is the molar solubility of AgCl (Ksp = 1.80 × 10⁻¹⁰) in 0.560 M NH₃? (Kf of Ag(NH₃)₂⁺ is 1.7 × 10⁷)
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03/02/21

What is the molecularity of each of the elementary steps?
step 1:      Mo(CO)6 → Mo(CO)5 + CO    step 2:     Mo(CO)5 + L → Mo(CO)5La. Step 1 is unimolecular and step 2 is bimolecular.b. Step 1 is unimolecular and step 2 is unimolecular.c. Step 1 is... more
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03/02/21

A sample of ideal gas occupies a volume of 1.28 L at 45 ̊C and 1.2 atm. What is the volume of the gas at STP? (combined gas law)
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03/02/21

What is the density of xenon gas at STP? a) 2.75 b)4.10 c) 5.86 d) 7.22
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03/02/21

chemistry hw help
Which of the following would have lower vapor pressure: a solution of water with 5 drops of food coloring or a solution of water with 2 drops of food coloring. Explain your answer.
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03/02/21

chemistry hw help

Calculate the density of a NH3 gas having a pressure of 34mmHg and a temperature of 233K
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03/02/21

Chemistry hw question
If a molecule of H2 diffuses a speed of 340 m/s from a point source, calculate the speed that a molecule of O2 would diffuse under the same conditions for the same period of time.
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03/02/21

Be mindful of the sign for change in product and change in reactant concentration
A + 3B → 2CIf ∆B/∆t is −0.74 M/s, what is ∆A/∆t in M/s?Be mindful of the sign for change in product and change in reactant concentration.
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03/02/21

What fraction (in decimal notation) of the pesticide remains in the environment after 15 days?

The half-life of a pesticide determines its persistence in the environment. A common pesticide degrades in a first-order process with a half-life of 2 days. What fraction (in decimal notation) of... more
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03/02/21

The half-life of a pesticide determines its persistence in the environment
The half-life of a pesticide determines its persistence in the environment. A common pesticide degrades in a first-order process with a rate constant of 6.9 1/hours. What is the half-life in hours... more
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03/02/21

How long (in years) does it take DDT in a soil sample to decrease from 295 ppbm to 14 ppbm (part per billion by mass)?
A biochemist studying the breakdown of the insecticide DDT finds that it decomposes by a first-order reaction with a half-life of 12.1 years. How long (in years) does it take DDT in a soil sample... more
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03/02/21

How long (in seconds) will it take for the concentration of AB to reach one-third of its initial concentration of 1.12?

For the simple decomposition reaction:  AB(g)  A(g) + B(g), the rate = k{AB}2   ({ = [) and k = 0.47 1/Ms.  How long (in seconds) will it take for the concentration of AB to reach one-third of its... more
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03/01/21

Determine the values of n
A violet line is observed at  in the spectrum of atomic hydrogen. Determine the values of  n for the beginning and ending energy levels of the electron during the emission of energy that leads to... more
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03/01/21

What is the average rate of the reaction
A+3B—>2C[A]/M Time /s0.80 00.40 150.20 30What is the average rate of the reaction with respect to A over the first 15 seconds of the reaction in M / s ? ( Express your answer... more
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03/01/21

2–>B+C indicates reaction

2–>B+CTwo trials of the above reaction are run. The concentration of A in the second reaction is twice that in the first. It is found that the initial rate of reaction in the first trial is the... more
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03/01/21

oxidation state of 2MnO4?
Im confused about what to do with the 2 in front of Mn & my sheet says that Mn has a state of +7? How was that found?
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03/01/21

Help with chemistry problem please!!
If 100 ml of water at 72 C is mixed into a calorimetry apparatus that has 125 ml of water at18.2 O C, and the final temperature of the mixture is 41 C, then what is the calibration constant(C) of... more
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03/01/21

2A—>B+C indicates the reaction

2–>B+CTwo trials of the above reaction are run. The concentration of A in the second reaction is twice that in the first. It is found that the initial rate of reaction in the first trial is the... more
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03/01/21

2 AgNO3(aq) + CaBr2(aq) → 2 AgBr(s) + Ca(NO3)2. What volume (mL) of a 0.125 M CaBr2 solution would be required to react completely with 50.0 mL of 0.115 M AgNO3?
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