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Chemistry

12/05/23

At 1 atm, how much is required to heat 75 g of solid H2O at -10°C to H2O gas at 133°C?

At 1 atm, how much is required to heat 75 g of solid H2O at -10°C to H2O gas at 133°C? Quantity per gram per mole Enthalpy of fusion at 0°C 333.6 J/g 6010. J/mol Enthalpy of... more

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Chemistry

12/05/23

If 3.45 g of N2 H4 reacts with excess oxygen and produces 0.950 L of N2 at 295K and 1.00 ATM what is the percent yield of the reaction

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Chemistry

12/05/23

26. Sulfur dioxide and nitrogen dioxide react at 298 K via the reaction SO2(g)+NO2(g)⇌SO3(g)+NO(g)

Sulfur dioxide and nitrogen dioxide react at 298 K via the reactionSO2(g)+NO2(g)⇌SO3(g)+NO(g)A system at equilibrium contains 0.376 mol SO2 , 0.376 mol NO2 , 0.703 mol SO3 , and 0.695 mol NO. O2 is... more

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Chemistry

12/05/23

25. Consider the following reaction. 2N*O_{2}(g) = N_2O_4(g)

Consider the following reaction.2N*O_{2}(g) = N_2O_4(g)When the system is at equilibrium, it contains NO_{2} at a pressure of 0.810 atm, and N_{2}O_{4} at a pressure of 0.0656 atm. The volume of... more

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Chemistry

12/04/23

Balance this nuclear reaction by supplying the missing nucleus. Replace each question mark with an appropriate integer symbol.

Balance this nuclear reaction by supplying the missing nucleus. Replace each question mark with an appropriate integer symbol.24998Cf+ :??? ---->260105Db+410n

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Chemistry

12/04/23

How many neutrons are needed to initiate the fission reaction?

How many neutrons are needed to initiate the fission reaction?23592 U+?10n--->13752Te +9740Zr+210nnumber of neutrons:?

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Chemistry

12/04/23

Identify the missing species in each nuclear equation. Replace the question marks with the appropriate integer or symbol.

Identify the missing species in each nuclear equation. Replace the question marks with the appropriate integer or symbol. 104Be----> 105B+ : ? 3414Si---> 3415 P+ :?19278Pt---> :? +42a:?... more

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Chemistry

12/04/23

How many half-lives of the unknown radioactive substance have occurred?

A 919.8ng sample of an unknown radioactive substance was placed in storages and its was measured periodically. After 47 days the amount of radioactive substance had decreased to 15.0 ng. How many... more

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Chemistry

12/04/23

calculate the number of days it will take for the mass to be reduced to 3.00μg.

The half-life of radioactive chromium-51 is 28 days. If a sample of chromium -51 has a mass of 12.0 μg, calculate the number of days it will take for the mass to be reduced to 3.00μg.time: ?days

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Chemistry Biology

12/04/23

can you solve this using the C1V1= C2V2 equation

the volume of the water is 125 ul and the volume and the source of protein is 375 stock and the final volume is 500 uL what is the final protein concentration?

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Chemistry

12/04/23

Definition of acidic solution

Which of the following is a correct definition of an acidic aqueous solution?I. A solution where [H+]>[OH]- II. A solution with pH<7A. I, onlyB. Both I and IIC. II, onlyD. Neither I nor II

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Chemistry

12/04/23

pH of neutral solution

What is the pH of pure water at body temperature of 37 degree Celsius? Kw of water at that temperature is 2.4x10-14

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Chemistry

12/04/23

Question is in the description.

1.) the gas molecules from ceaser/s last breath are now evenly dispersed in the atmosphere. 2. The atmosphere is 50 km thick, has an average temperature of 15 \deg C, and an average pressure... more

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Chemistry

12/04/23

question in the description. I know that partial pressure of NO=O

Two bulbs are connected by a stopcock. The large bulb, with a volume of 6.00 L, contains nitric oxide at a pressure of 0.650 atm, and the small bulb, with a volume of 1.50 L, contains oxygen at a... more

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Chemistry

12/04/23

Need some help on this problem. I think I know the answer, but I'm not confident.

A student had a sample of a heterogeneous mixture containing only two components. The student wanted to separate the components and the student knew that one of the components was soluble in HCl... more

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Chemistry

12/04/23

I need help on these chemistry problems. Cant seem to figure out the solubilities.

A solution of CuSO4 was prepared and added to a well on a 24-well plastic plate. A piece of metal was placed into the solution. The CuSO4 solution did not react with the piece of metal that was... more

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Chemistry

12/03/23

Express each of these concentrations in parts per million

A.) 6.5 milligrams per kilogram of water B.) 6.5 Micrograms per kilogram of waterC.) 6.5 nanograms per kilograms of water

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Chemistry

12/03/23

The vapor pressure of pure benzene is 96.0 torr. The vapor pressure of pure toluene is 27.0 torr

A.) Calculate the vapor pressure of benzene, C6H6, at 25 degrees Celsius in an ideal solution containing 1.68 mol of toluene. B.) Calculate the vapor pressure of toluene,C7H8, at 25 degrees Celsius... more

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Chemistry

12/03/23

Determine the van't Hoff factors (i) for the following solutions. Assume 100% dissociation for ionic solutes

A). 0.35M NaCl B.) 0.0038M MgBr2 C.) 1.269M C6H12O6\D.) 0.087M Ca(ClO4)2

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Chemistry

12/03/23

why are the melting points of ionic compounds higher than covalent

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Chemistry

12/03/23

A reaction has t=0, and t=54 min. What is the half-life of the reaction if the reaction follows first-order kinetics.

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Chemistry

12/03/23

If the initial concentration of A is 0.407 M, and the rate constant for this reaction is 0.0341 M s^-1 at 400, What is the half-life of this reaction?

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Chemistry

12/03/23

What percentage of the molecules are at or above the activation energy at 500.0 K?

The activation energy for a particular reaction is Ea=16.00kj

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Chemistry

12/03/23

Reaction: O3(g) +NO(g) = O2(g)+NO2 has at 310K the rate law

Rate of reaction =k[O3][NO] k= 3.0x10^6Given that [O3]= 5.0x10^-4M and [NO]=6.0x10^-5M at t=0calculate that rate of the reaction at t=0

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Chemistry

12/03/23

Balance the nuclear equation by giving he mass number, atomic number, and element symbol for the missing species.

27Al+4He---->+10n. (supposed to be 1 over 0)

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At 1 atm, how much is required to heat 75 g of solid H2O at -10°C to H2O gas at 133°C?

If 3.45 g of N2 H4 reacts with excess oxygen and produces 0.950 L of N2 at 295K and 1.00 ATM what is the percent yield of the reaction

26. Sulfur dioxide and nitrogen dioxide react at 298 K via the reaction SO2(g)+NO2(g)⇌SO3(g)+NO(g)

25. Consider the following reaction. 2N*O_{2}(g) = N_2O_4(g)

Balance this nuclear reaction by supplying the missing nucleus. Replace each question mark with an appropriate integer symbol.

How many neutrons are needed to initiate the fission reaction?

Identify the missing species in each nuclear equation. Replace the question marks with the appropriate integer or symbol.

How many half-lives of the unknown radioactive substance have occurred?

calculate the number of days it will take for the mass to be reduced to 3.00μg.

can you solve this using the C1V1= C2V2 equation

Definition of acidic solution

pH of neutral solution

Question is in the description.

question in the description. I know that partial pressure of NO=O

Need some help on this problem. I think I know the answer, but I'm not confident.

I need help on these chemistry problems. Cant seem to figure out the solubilities.

Express each of these concentrations in parts per million

The vapor pressure of pure benzene is 96.0 torr. The vapor pressure of pure toluene is 27.0 torr

Determine the van't Hoff factors (i) for the following solutions. Assume 100% dissociation for ionic solutes

why are the melting points of ionic compounds higher than covalent

A reaction has t=0, and t=54 min. What is the half-life of the reaction if the reaction follows first-order kinetics.

If the initial concentration of A is 0.407 M, and the rate constant for this reaction is 0.0341 M s^-1 at 400, What is the half-life of this reaction?

What percentage of the molecules are at or above the activation energy at 500.0 K?

Reaction: O3(g) +NO(g) = O2(g)+NO2 has at 310K the rate law

Balance the nuclear equation by giving he mass number, atomic number, and element symbol for the missing species.

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