02/03/20

Rate Laws Given the data below for the reaction, 2 A + 2 B + 4 C => D + E + 3 F,

Given the data below for the reaction, 2 A + 2 B + 4 C => D + E + 3 F,  Experiment Initial conc of A, mol/L Initial conc of B, mol/L Initial conc of C, mol/L Initial rate,... more
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02/02/20

Which of the following is the correct rate law for the reaction?
For the reaction, 2 A(g) + 2 B(g) => C(g) + 3 D(g), the following data were obtained at constant temperature. Experiment Initial [A], mol/L Initial [B], mol/L Initial Rate,... more
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02/02/20

colligative properties
OS Chapter 11 Items9. Calculate the freezing point of a solution of 400.0 g of ethylene glycol (C2H6O2) dissolved in 600.0 g of water. A) 80.0°C B) -5.5°C C) 20.0°C D) -20.0°C E) 5.5°C Kf =... more
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02/01/20

write the steps required to prepare 250mL mL of an aqueous solution of copper (II) sulfate pentahydrate that has a concentration of 1.00 M
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01/31/20

You push down on the piston of a pump, and the volume decreases by half, which of the following happens?

The temp inside the piston triples The number of collisions per unit area is reduced by one-halfThe temp inside the chamber is reduced by one-halfThe number of collisions per unit area dounle
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01/31/20

A 1.0 balloon has a pressure of 2 atm. When the pressure increases to 2,000 kPa, what is the volume?

510 L2.00.20.1
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01/30/20

which of the following have the highest lattice energy? and Why/
Na2P or Na2O BeS or MgO
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01/30/20

Use this information to determine benzaldehyde’s vapor pressure (in torr) at 50.5°C.
The heat of vaporization for benzaldehyde is 48.8 kJ/mol, and its normal boiling point is 451.0 K. Use this information to determine benzaldehyde’s vapor pressure (in torr) at 50.5°C. Report your... more
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01/30/20

Determine the vapor pressue of pentane on a cold autumn morning when the temperature is 3.10 °C.
Portable lanterns and stoves used for camping and backpacking often use a mixture of C5 and C6 hydrocarbons known as "white gas." White gas is easy to transport but stoves that burn white gas are... more
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01/30/20

How to solve this Solution Chemistry problem?
A 48.83-mL sample of an ammonia solution is analyzed by titration with HCl. The reaction is given below.NH_3(aq) + H^+(aq) --> NH_4^+(aq)It took 38.00 mL of 0.0976 M HCl to titrate (react... more
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01/30/20

Chemistry . . . . . . . I dont understand how to do this and my teacher is little help.
In the reaction N2 + 3H2 Yields 2NH3, if 20.0g of hydrogen reacts, How many grams of NH3 are produced? How many grams of N2 react?
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01/29/20

Percent composition and empirical formulas

A sample of lidocaine contains 3.588 g of C, 0.473 g of H, 0.598 g of N, and 0.342 g of O. What’s the perfect composition and empirical formula of lidocaine
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01/29/20

Empirical formulas and % composition
If 100 g of aspirin contains 60.00 g of C, 4.480 g of H, and 35.53 g of O, what’s the empirical formula?
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01/29/20

Blueberry high-fiber muffins contain 51% dietary fiber. If a package with a net weight of 17 oz contains six muffins, how many grams of fiber are in each muffin

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01/29/20

Theoretical yield of CO2 produced by combustion
Assuming gasoline is 90.0% isooctane, with a density of 0.692 g/mL, what is the theoretical yield (in grams) of CO2 produced by the combustion of 1.10 x 1010 gallons of gasoline (the estimated... more
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01/29/20

Biology Question
How much milliliters of absolute ethanol (100% ethanol) would you mix with how much milliliter of pure water to make 100ml of 70% (v/v) ethanol solution ?
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01/25/20

When 5.0 grams of a substance are burned in a calorimeter, 3.0 kilojoules of energy are released. What amount of energy(in joules) is released per gram?
The partial answer is: 6XX J/g
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01/25/20

How do you calculate the standard enthalpy change for the reaction at 25 ∘ C. ??

Mg ( OH ) 2 ( s ) + 2 HCl ( g ) ⟶ MgCl 2 ( s ) + 2 H 2 O ( g )
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01/24/20

How do you determine the lattice energy of MX 2?
The enthalpy of formation of MX 2 is Δ H ∘ f = − 973 kJ/mol. The enthalpy of sublimation of M is Δ H sub = 141 kJ/mol. The 1st and 2nd ionization energies of M are IE 1 = 705 kJ/mol... more
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01/24/20

What is the molal concentration of a solution containing 5.096 g of sodium sulfate in 104.015 g of water?
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01/23/20

The temperature of a sample of water in the liquid phase is changed from 15°C to 25°C by the addition of 810 calories. What is the mass of the water?
The partial answer is: 1X g
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01/23/20

The temperature of a sample of water increases from 30.0° C to 40.0°C as 6940 joules of heat are added. What is the mass of the sample of water?
The partial answer is: 1XX g
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01/23/20

During an experiment to determine the heat of a reaction, 590 g of water in a calorimeter increased in temperature from 18° C to 28°C. What is the approximate number of kJ given off by the reaction?
The partial answer is:2X kJ
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01/23/20

What will be the final temperature when 15.0 kJ are added to 150 grams of water at 25°C?
The partial answer is:4X°C
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01/23/20

chemical eqautions
Chloroform (CHCl3), an important solvent, is produced by a reaction between methane and chlorine.CH4(g) + 3 Cl2(g)  CHCl3(g) + 3 HCl(g)How many grams of CH4 is needed to produce 52.0 g CHCl3?
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