01/31/23

Consider the reaction below: 2 CO(g) + O₂(g) ⇌ 2 CO₂(g)
Consider the reaction below: 2 CO(g) + O₂(g) ⇌ 2 CO₂(g) If Kc is 2.24 × 10²² at 1273.0 °C, what is Kp at the same temperature? (R = 0.08206 L･atm/mol･K.)
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01/30/23

Mass Percent of NaCl dissolved in H2O
When 50.0g of NaCl(s) is dissolved in 350. mL of water (density: 1.00 g/mL), the percent by mass of this solution is:Mass percent: grams of solute / grams of solution * 100%Mass percent: 50.0g... more
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01/30/23

A molecular biologist measures the mass of cofactor A in an average yeast cell. The mass is 98.35pg. What is the total mass in micrograms of cofactor A in a yeast colony containing 10^5 cells?
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01/30/23

Help with chem question
"A solution containing both barium nitrate and silver nitrate is added to a solution of the unknown sodium salts used in this exercise. What anion(s) will not produce a precipitate? What test could... more
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01/28/23

In one experiment, a 0.8024 g sample of the mixture resulted in 0.9978 g of AgBr. Determine the percent (by mass) of Zn in the mixture.
A mixture of ZnBr2 and inert material is analyzed to determine the Zn content. First the mixture is dissolved in water. Then all of the bromide ion is precipitated as AgBr by the addition of an... more
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01/28/23

What is the solubility of Mg(OH)₂ at a pH of 12.00? (Ksp Mg(OH)₂ is 1.6 × 10⁻¹³)
What is the solubility of Mg(OH)₂ at a pH of 12.00? (Ksp Mg(OH)₂ is 1.6 × 10⁻¹³)
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01/28/23

SrF₂ write the equilibrium equation for the acid or base that exists when the salt is dissolved in an aq solution.
Determine if the following salt is neutral, acidic or basic. If acidic or basic, write the appropriate equilibrium equation for the acid or base that exists when the salt is dissolved in aqueous... more
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01/28/23

What is the solubility of Cr(OH)₃ at a pH of 10.50? (Ksp Cr(OH)₃ is 6.70 × 10⁻³¹)
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01/28/23

What is the solubility of La(IO₃)₃ in a solution that contains 0.250 M La³⁺ ions? (Ksp of La(IO₃)₃ is 7.5 × 10⁻¹²)
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01/28/23

What is the solubility of La(IO₃)₃ in a solution that contains 0.250 M La³⁺ ions? (Ksp of La(IO₃)₃ is 7.5 × 10⁻¹²)
What is the solubility of La(IO₃)₃ in a solution that contains 0.250 M La³⁺ ions? (Ksp of La(IO₃)₃ is 7.5 × 10⁻¹²)
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01/28/23

freezing point of glycerine in water
2-8. What mass of glycerin (C3H8O3), a nonelectrolyte, must be dissolved in 200g H2O to give a solution with a freezing point Tf=-1.50oC？(For C3H8O3, molar mass =92g/mol, and the Kf for... more
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01/28/23

The decomposition of ethylene oxide is a fist order reaction with a half life of 58.0 min at 652k. The activation energy of the reaction is 218 kj/mol. Calculate the half life at 623k
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01/28/23

How many total atoms are there in 15.7 g of ammonia ( NH3 )?
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01/28/23

Homolytic Bond Cleavage

Calculate the wavelength of the photons that will homolytically cleave a typical C-I bond.
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01/28/23

A 3.0 L container holds a sample of oxygen gas at 1.5 atm pressure. If the pressure increases to 2.0 atm and the temperature remains constant, what is the new volume of the container
A 3.0 L container holds a sample of oxygen gas at 1.5 atm pressure. If the pressure increases to 2.0 atm andthe temperature remains constant, what is the new volume of the container
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01/27/23

A solution is made using 150.0 mL of ethanol (density 0.7892 g/mL) and 350.0 mL of water (density 1.000 g/mL). What is the molality ethanol in water?
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01/27/23

What is the freezing point, in °C, of a solution made with 1.31 mol of CHCl₃ in 530.0 g of CCl₄ (Kf = 29.8 °C/m, normal freezing point, Tf = -22.9 °C)?
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01/27/23

What amount of heat (in kJ) is required to convert 19.1 g of an unknown liquid (MM = 83.21 g/mol) at 19.2 °C to a gas at 93.5 °C? (specific heat capacity of liquid = 1.58 J/g･ °C;

specific heat capacity of gas = 0.932 J/g･ °C; ∆Hvap = 22.5 kJ/mol; normal boiling point, Tb = 57.3 °C)
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01/27/23

equlibrium buffer solution
4-8. Which of the following solutions show buffer properties? Calculate the pH of each solution that is buffered. pK of NH3 = 4.75. (a) 0.10 L of 0.25 M NH4Cl + 0.15 L 0.25 M NaOH (b) 0.10 L of... more
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01/27/23

Calculate the frequency of each of the following wave lengths of electromagnetic radiation.
a) 632.8 nmnm (wavelength of red light from helium-neon laser)b) 503 nmnm (wavelength of maximum solar radiation)c) 337.1 nmnm (wavelength of nitrogen laser)
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01/27/23

A sample of a gas takes up 2.35L of space at room temperature (20.0ºC). What volume will the gas occupy at -5.00ºC? (Hint: Don’t forget to convert the temperatures to kelvins.
A sample of a gas takes up 2.35L of space at room temperature (20.0ºC). What volume will the gas occupy at-5.00ºC? (Hint: Don’t forget tA sample of a gas takes up 2.35L of space at room temperature... more
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01/26/23

How many moles of carbon dioxide (CO2) will form when 16.3 moles of water (H2O) form in the reaction below?
C3H8 + 5 O2  →  3 CO2  +  4 H2O
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01/26/23

Stoichiometry Reaction

For the reaction of 0.1575 moles of magnesium bromide with an excess of silver nitrate according to the given equation:MgBr2 (aq) + AgNO3 (aq) → AgBr (s) + Mg(NO3)2 (aq)#1.) Calculate how many... more
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01/25/23

lattice energy and heat hydration
Magnesium chloride (MgCl2) has a lattice energy of −2326 kJ/mol and a heat of hydration of −2486 kJ/mol. What volume of solution could be heated from 25.0 °C to 100.0 °C by the heat evolved from... more
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01/25/23

Convert 57.0 L carbon monoxide (at STP) to grams.
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