25,963 Answered Questions for the topic chemistry

Chemistry

02/11/24

Calculate the pressure
The rate constant for the low pressure decomposition of N₂O₄(g) is 3.60 × 10⁴ L･mol⁻¹･s⁻¹ at 250 K. If the initial pressure of N₂O₄(g) is 35.0 torr at 250 K, calculate the pressure of N₂O₄(g)... more
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Chemistry

02/11/24

Buffer Solution Calculation
A buffer solution was prepared by adding 0.345 mol of sodium fluoride to 1.35L of 0.0619M hydrofluoric acid solution. Determine [H3O+] at equilibrium in this buffer. Assume that the volume of the... more
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Chemistry

02/11/24

What amount of heat (in kJ) is required to convert 19.1 g of an unknown solid (MM = 83.21 g/mol) at -5.00 °C to a liquid at 52.3 °C?

(heat capacity of solid = 2.39 J/g･°C; heat capacity of liquid = 1.58 J/g･°C; ∆Hfus = 3.72 kJ/mol; Tf = 10.3°C). Please give me each step to how you came up with your answer.
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Chemistry

02/11/24

What is the vapor pressure of ethanol (in mmHg) at 43.9°C if its vapor pressure is 400.0 mmHg at 63.5°C? (∆Hvap = 39.3 kJ/mol; R = 8.314 J/K • mol)
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Chemistry Biochemistry

02/11/24

What is the silver ion concentration in a solution prepared by mixing 341 mL 0.388 M silver nitrate with 375 mL 0.506 M sodium chromate? The Ksp of silver chromate is 1.2*10^-12

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Chemistry Biochemistry

02/11/24

What is the concentration of Ca2+ in this solution if [OH-] is fixed at 3.00*10^-4 M?
Hydroxyapatite, Ca10(PO4)6(OH)2 has a solubility constant of Ksp= 2.34*10^-59 and dissociates according to:Ca10(PO4)6(OH)2 (s)—> 10Ca 2+ (aq) + 6PO4 3- (aq) + 2 OH- (aq). Solid hydroxyapatite is... more
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Chemistry

02/10/24

What amount of heat would be involved in condensing 14.7 g of CH₃OH? (∆Hvap = 38.0 kJ/mol)
What amount of heat would be involved in condensing 14.7 g of CH₃OH? (∆Hvap = 38.0 kJ/mol). I need the answer in kj
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Chemistry

02/10/24

Unifying Heat of reaction

Calculate the amount of heat needed to boil 74.1 g of water beginning from a temperature of 25.0°C.
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Chemistry

02/10/24

Unifying heat of reaction

Calculate the amount of heat needed to melt 135.g  of solid ethanol and bring it to a temperature of -47.6° C. Be sure your answer has a unit symbol and the correct number of significant digits.
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Chemistry

02/10/24

Using heat of fusion

Calculate the amount of heat needed to boil 70.1 g of methanol (CH3OH), beginning from a temp of -30.9°C.
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Chemistry

02/10/24

Can you please help me solve this problem

On a 5 day wilderness expedition you'll need to heat 5.0 kg of water to the boiling point each day. The air temperature will average 25 °C. You have available canisters of compressed butane (CH10)... more
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Chemistry

02/09/24

question is in the description

The decompostion of N2O5 can be described by the quation, 2N2O5(soln)->4NO2(soln) + O2(g)consider the data table for the reaction at 45 degrees celcius in carbon tetrachlorideData... more
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Chemistry

02/09/24

Question is in the description

Reaction: A+B-> C+D rate = K[A]^2[B]^2initial rate is 0.0970 M/swhat will the initial rate be if [A] is halved and [B] is tripled
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Chemistry

02/09/24

Activation Energy

Calculate the activation energy of a reaction if a temperature increase from 25.0 °C to 55.0 °C triples the rate constant. R = 8.3145 ×10⁻³ kJ/mol･K.
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Chemistry

02/07/24

General Chemistry II
The addition of 44.6g of a nonvolatile solute to 2.30 mol of benzene lowers the vapor pressure of benzene from 105.8 torr to 97.0 torr. Calculate the molar mass of the solute.
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Chemistry

02/07/24

Determine the vapor pressure of this solution at 25˚C, given that the vapor pressure of pure water at this temperature is 23.8 mm Hg.
Antifreeze is usually composed of a 1:1 mixture, by weight, of water and ethylene glycol (MW = 62.068 g/mol). Determine the vapor pressure of this solution at 25˚C, given that the vapor pressure of... more
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Chemistry

02/07/24

Zero order reaction
The zero order reaction A → Products takes 63.5 minutes for the concentration of A to decrease from 0.970 M to 0.241 M. What is the value of k for this reaction?
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Chemistry

02/07/24

Second Order Reaction
The second order reaction A → Products takes 13.5 s for the concentration of A to decrease from 0.740 M to 0.333 M. What is the value of k for this reaction?
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Chemistry

02/07/24

Equilibrium Pressures
3 H2 (g) + N2 (g) ↔ 2NH3 (g), Kp = 1.64 x 10-4In a reaction vessel containing only NH3 at 400°C, the initial pressure of NH3 is 0.850 In a reaction vessel containing only NH3 at 400°C, the... more
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Chemistry

02/07/24

The activation energy for a particular reaction is 102 kJ/mol. If the rate constant is 1.35 × 10⁻⁴ s⁻¹ at 314 K, what is the rate constant at 273 K?
this question has to do with integrated rate law.
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Chemistry

02/07/24

What is the concentration of A after 13.3 minutes for the reaction A → Products when the initial concentration of A is 0.750 M? (k = 0.0451 M⁻¹min⁻¹)
this has to do with integrated rate law
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Chemistry

02/07/24

Calculate the enthalpy change in kJ when 6.32 g P reacts with 14.2 liquid Br2
Red phosphorus reacts with liquid bromina according to the thermochemical reaction. Calculate the enthalpy change in kJ when 6.32 g P reacts with 14.2 liquid Br22P (s) + 3Br2(l) --> 2PBr3 (g) ... more
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Chemistry

02/07/24

what is the heat of formation for C2F3O (g)?
The EPA released a national drinking water health advisory for GenX, a class of compounds that are known polyfluoroalkyl substances. These chemicals have broad uses. The thermal decomposition of... more
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Chemistry

02/07/24

What is the heat change in enthalpy for the reaction (kJ/mol) of Mg(OH)2?

A common antacid called "Milk of Magnesia" uses magnesium hydroxide to neutralize excess hydrochloric acid in the stomach. The name comes from the fact that magnesium hydroxide has low solubility... more
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Chemistry

02/07/24

Gas Stoichiometry
If acetylene is burned in a combustion reaction, a) What is the number of grams in acetylene would be needed to produce 63 liters of CO2 at the temperature of 1000 C?b) How many grams (in water)... more
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