J.R. S.

Reactants A and B are combined to form product C as shown by the equation below:2A(g) + B(g) ⟷3C(g)0.258 mol of A is combined with 0.163 mol of B in a 2.14 L rigid container at standard... more

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Chemistry

04/20/21

How many half-lives will pass by the time 1.56% of I-131 is present?B. Approximately how many days does that equal? *

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Chemistry Organic Chemistry Inorganic Chemistry

04/20/21

how do i create a buffer system with ph=6.4?

Creating a buffer system: Desired pH = 6.4What is the best acid to use?What is the pKa of the acid?Ratio Ha/A- Ratio A-/HA I was thinking to use Si(OH)4 because it has a pH of 6.4 but I'm not sure... more

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Chemistry General Chemistry College Chemistry

04/20/21

From the data below, calculate the total heat (in J) needed to convert 0.816 mol of gaseous ethanol at 300.0°C and 1 atm to liquid ethanol at 25.0°C and 1 atm:

b.p. at 78.d degrees Ccgas: 1.43 J/g. degrees CDelta Hvap: 40.5 kJ/molcliquid: 2.45 J/g. degrees C

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Chemistry

04/20/21

MY chem teacher never helps

Balance the following chemical equation:a. AD₄ + X₂ → AX₂ + D₂Xb. Use the balanced equation to calculate the grams of AX2 (Molar mass = 50.01 g/mol) produced from the reaction of 8.40... more

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Chemistry

04/20/21

Help me please. Cant get my head around this one

In the reaction below, how many moles of A2 will be used to produced 2.45 mol of XA?a. Balance the chemical equation: XY₃ + A₂ → XA + Y2Ab. moles A2

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Chemistry

04/20/21

Help big test today

According to the reaction below, how many moles of X(ZY₃)₃ is produced when 11.3 mol of A(ZY₃)₂ are reacted with XD₃? AD₂ is also produced during the reaction.3A(ZY₃)₂ + 2XD₃ → 3AD₂ + 2X(ZY₃)₃

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Chemistry

04/20/21

Color change during a titration

Good day i have two questions: 1) I want to perform a standardization of H2SO4 against standardized NaOH using phenolphthalein indicator, which solution is gonna be in the burette? is it the H2SO4... more

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Chemistry

04/20/21

Calculate the mole fraction of HCOOH in an aqueous solution containing35.5%by mass of HCOOH?

Mhcooh= 46g/mol Mh2o=18g/mol

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Science Chemistry

04/20/21

An aqueous reaction is taking place in a liter of water that is being stirred in a 5-liter flask. If the entire reaction was transferred to a 2-liter flask, what's effect on the overall reaction rate?

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Chemistry Ap Chemistry

04/20/21

Write a chemical equation for each that illustrates its reaction with water. Explain why they act as bases. Identify the conjugate acid in each of the reactions.

Write a chemical equation for each that illustrates its reaction with water. Explain why they act as bases. Identify the conjugate acid in each of the reactions. cyanide ion, CN–

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Chemistry Ap Chemistry

04/20/21

Write a chemical equation for each that illustrates its reaction with water. What makes these substances acids? Identify the conjugate base in each of the re- actions.

Write a chemical equation for each that illustrates its reaction with water. What makes these substances acids? Identify the conjugate base in each of the re- actions.ammonium ion, NH4+

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Chemistry Organic Chemistry Inorganic Chemistry

04/20/21

How do you determine ph when concentration of futylamine is equal to concentration of conjugate acid graphically?

I have a titration curve, and I have the concentration for futylamine, but not the conjugate acid. I also have the molecular equation and net ionic one and an expression for ka, but I have no idea... more

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Chemistry

04/19/21

What is the molality of a solution containing 13.4 g Na2SO4 dissolved in 1524.9 g of water?

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Chemistry

04/19/21

What are the boiling point and freezing point of a 0.488 m aqueous solution of any nonvolatile, nonelectrolyte solute?

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Chemistry

04/19/21

At 22 °C, an excess amount of a generic metal hydroxide, M(OH)2, is mixed with pure water.

The resulting equilibrium solution has a pH of 10.26. What is the 𝐾sp of the salt at 22 °C?Ksp= ?

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Chemistry

04/19/21

What is the percent of copper in the 0.0125 moles of copper (ii) sulfate?

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Chemistry

04/19/21

Thermochemical Stoichiometry

The following thermochemical equation is for the reaction of tetraphosphorus decaoxide(s) with water(l) to form phosphoric acid(aq). P4O10(s) + 6H2O(l)4H3PO4(aq) H = -453 kJ How many grams of... more

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Chemistry

04/19/21

Hess’s Law: Two Reactions

Given the standard enthalpy changes for the following two reactions:(1) N2(g) + 2O2(g)N2O4(g)...... ΔH° = 9.2 kJ(2) 2N2O(g)2N2(g) + O2(g)......ΔH° = -164.2 kJwhat is the standard enthalpy change... more

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The condensed liquid of an unknown has mass of 0.40g. You calculated, when in the vapor phase, that there at 8.7 x 10^-3 mol present in the flask. What is the molecular weight of the unknown molecule?

The Dumas method was used to determine the molecular weight of an unknown liquid. The vapor occupied a 525mL flask at a temp of 114 degrees celsius & 850mm Hg pressure...

When 25mL of a 0.5 M solution of ZnCl2 reacts with an excess of magnesium, how much zinc metal is produced?

The 𝐾sp of manganese(II) hydroxide, Mn(OH)2, is 2.00×10−13 .

A generic salt, AB3 , has a molar mass of 251 g/mol and a solubility of 1.10 g/L at 25 °C.

The rate constant for the decay of a radioactive element is 1.48 × 10⁻³ day⁻¹. What is the half-life of this element?

Reactants A and B are combined to form product C as shown by the equation below:

How many half-lives will pass by the time 1.56% of I-131 is present?B. Approximately how many days does that equal? *

how do i create a buffer system with ph=6.4?

From the data below, calculate the total heat (in J) needed to convert 0.816 mol of gaseous ethanol at 300.0°C and 1 atm to liquid ethanol at 25.0°C and 1 atm:

MY chem teacher never helps

Help me please. Cant get my head around this one

Help big test today

Color change during a titration

Calculate the mole fraction of HCOOH in an aqueous solution containing35.5%by mass of HCOOH?

An aqueous reaction is taking place in a liter of water that is being stirred in a 5-liter flask. If the entire reaction was transferred to a 2-liter flask, what's effect on the overall reaction rate?

Write a chemical equation for each that illustrates its reaction with water. Explain why they act as bases. Identify the conjugate acid in each of the reactions.

Write a chemical equation for each that illustrates its reaction with water. What makes these substances acids? Identify the conjugate base in each of the re- actions.

How do you determine ph when concentration of futylamine is equal to concentration of conjugate acid graphically?

What is the molality of a solution containing 13.4 g Na2SO4 dissolved in 1524.9 g of water?

What are the boiling point and freezing point of a 0.488 m aqueous solution of any nonvolatile, nonelectrolyte solute?

At 22 °C, an excess amount of a generic metal hydroxide, M(OH)2, is mixed with pure water.

What is the percent of copper in the 0.0125 moles of copper (ii) sulfate?

Thermochemical Stoichiometry

Hess’s Law: Two Reactions

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Emmersion

The condensed liquid of an unknown has mass of 0.40g. You calculated, when in the vapor phase, that there at 8.7 x 10^-3 mol present in the flask. What is the molecular weight of the unknown molecule?

The Dumas method was used to determine the molecular weight of an unknown liquid. The vapor occupied a 525mL flask at a temp of 114 degrees celsius & 850mm Hg pressure...

When 25mL of a 0.5 M solution of ZnCl2 reacts with an excess of magnesium, how much zinc metal is produced?

The 𝐾sp of manganese(II) hydroxide, Mn(OH)2, is 2.00×10−13 .

A generic salt, AB3 , has a molar mass of 251 g/mol and a solubility of 1.10 g/L at 25 °C.

The rate constant for the decay of a radioactive element is 1.48 × 10⁻³ day⁻¹. What is the half-life of this element?

Reactants A and B are combined to form product C as shown by the equation below:

How many half-lives will pass by the time 1.56% of I-131 is present? B. Approximately how many days does that equal? *

how do i create a buffer system with ph=6.4?

From the data below, calculate the total heat (in J) needed to convert 0.816 mol of gaseous ethanol at 300.0°C and 1 atm to liquid ethanol at 25.0°C and 1 atm:

MY chem teacher never helps

Help me please. Cant get my head around this one

Help big test today

Color change during a titration

Calculate the mole fraction of HCOOH in an aqueous solution containing35.5%by mass of HCOOH?

An aqueous reaction is taking place in a liter of water that is being stirred in a 5-liter flask. If the entire reaction was transferred to a 2-liter flask, what's effect on the overall reaction rate?

Write a chemical equation for each that illustrates its reaction with water. Explain why they act as bases. Identify the conjugate acid in each of the reactions.

Write a chemical equation for each that illustrates its reaction with water. What makes these substances acids? Identify the conjugate base in each of the re- actions.

How do you determine ph when concentration of futylamine is equal to concentration of conjugate acid graphically?

What is the molality of a solution containing 13.4 g Na2SO4 dissolved in 1524.9 g of water?

What are the boiling point and freezing point of a 0.488 m aqueous solution of any nonvolatile, nonelectrolyte solute?

At 22 °C, an excess amount of a generic metal hydroxide, M(OH)2, is mixed with pure water.

What is the percent of copper in the 0.0125 moles of copper (ii) sulfate?

Thermochemical Stoichiometry

Hess’s Law: Two Reactions

Still looking for help? Get the right answer, fast.

OR

J.R. S.

How many half-lives will pass by the time 1.56% of I-131 is present?B. Approximately how many days does that equal? *