25,963 Answered Questions for the topic chemistry
Chemistry
07/17/23
Ionization Reactions
Write the balanced 𝐾a and 𝐾b reactions for HSO−3HSO3− in water. Include physical states for each species.𝐾a:HSO−3(aq)+H2O(l)↽−−⇀H3O+(aq)+SO2−3(aq)HSO3−(aq)+H2O(l)↽−−⇀H3O+(aq)+SO32−(aq)𝐾b: ?
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Chemistry
07/17/23
Ionization reactions
Write the chemical reaction for chlorous acid in water, whose equilibrium constant is 𝐾a. Include the physical states for each species.𝐾a reaction:Write the chemical reaction for the chlorite ion...
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Chemistry
07/17/23
Acid based properties
NH3 is a weak base ( 𝐾b=1.8×10−5 ) and so the salt NH4Cl acts as a weak acid. What is the pH of a solution that is 0.045 M in NH4Cl at 25 °C? pH= ?
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Chemistry
07/15/23
Calculate the mass percent of Oxygen
Calculate the mass percent of Oxygen inSethium Oxide (St2 O3) using the masses shown below:St - 192.09O - 15.999
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Chemistry
07/15/23
How many moles of oxygen
How many moles of oxygen are in 2.5 moles of tantalum (II) hydroxide Ta(OH)2?
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Chemistry
07/14/23
chemistry: Fundamentals and Principals
Consider a sample containing 0.320 mol of a substance. How many atoms are in the sample if the substance is lead?How many atoms are in the sample if the substance is gold?How many molecules are...
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Chemistry
07/13/23
Volume Molarity
What volume in mL of 0.484 M Kbr is required to fully react with 69.41 mL of 0.183 M Pb(ClO4)2?
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Chemistry
07/12/23
Chemistry 2 - Equilibrium Constant
At 423 K, this reaction has a 𝐾c value of 0.0659.X(g)+3Y(g)↽−−⇀2Z(g)Calculate 𝐾p at 423 K. Note that the pressure is in units of atmosphere (atm).𝐾p= ?
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Chemistry
07/12/23
Chemistry 2 - Partial Pressure
At a certain temperature, the equilibrium constant, 𝐾, for the given reaction is 53.3.H2(g)+I2(g)↽−−⇀2HI(g)𝐾=53.3 At this temperature, the reactants were placed in a container to react. If the...
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Chemistry
07/12/23
Chemistry 2 - Equilibrium Constant
The equilibrium constant for the chemical equationN2(g)+3H2(g)↽−−⇀2NH3(g)is 𝐾p=0.0328 at 201 ∘C. Calculate the value of 𝐾c for the reaction at 201 ∘C.𝐾c= ?
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Chemistry
07/12/23
Chemistry 2 - Activation energy
Calculate the activation energy, 𝐸a, in kilojoules per mole for a reaction at 57.0 ∘C that has a rate constant of 0.297 s−1 and a frequency factor of 6.66×10^11 s−1.𝐸a = ? kJ/mol
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Chemistry
07/12/23
Chemistry 2 - Ice
When determining the equilibrium concentrations for the reactionAB(g)↽−−⇀A(g)+B(g)𝐾c=[A][B][AB] a simplifying assumption can be used under certain conditions to avoid solving a quadratic...
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Chemistry
07/12/23
Chemistry 2 - Calculating using ICE
Consider the given reaction.A(aq)+B(s)↽−−⇀C(aq) 𝐾=9.40Suppose 18.5 mol A reacts with excess B in 9.15 L of solution. Calculate the concentration of C at equilibrium.[C]= ? M
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Chemistry
07/12/23
Chem 2 - Rate law
The rate constant for this first-order reaction is 0.0152 s−1 at 300 °C. A⟶products If the initial mass of A is 17.92 g, calculate the mass of A remaining after 1.91 min. mass of A: ? g
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Chemistry
07/11/23
Chemistry help?
Ethylene glycol (C₂H₆O₂) is used as an additive to the water in your automobile to lower its freezing point. A solution of ethylene glycol in water has a freezing point of -5.80 °C. What mass (in...
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Chemistry
07/10/23
What is the number of formula units in a 6.70 mol sample of FeCl3
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Chemistry
07/10/23
Balance the following redox reaction in basic solution. TeO₃²⁻(aq) + As(s) → Te(s) + H₂AsO₄⁻(aq)
Balance the following redox reaction in basic solutionComplete and balance the following redox reaction in basic solution. Be sure to include the proper phases for all species within the...
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Chemistry
07/10/23
0.700 moles of an unknown solid is placed into water to make 150.0 mL of solution. The solution's temperature decreases by 6.11 °C. Calculate ∆H, in kJ/mol, for the dissolution of the unknown solid.
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Chemistry
07/09/23
Container A contains 1.00 mole of Xe gas and Container B contains 1.00 mole of He gas. Both gases are at 100.0 °C. How much faster will the He diffuse than Xe?
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Chemistry
07/05/23
Average atomic mass problem
An element consists of three isotopes. The abundance of one isotope is 92.21% and its atomic mass is 27.97693 amu. The abundance of the second isotope is 4.70% and its atomic mass is 28.97649 amu....
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Chemistry
07/03/23
Balancing Equations
Balance the following equations for reactions in basic solution by the half-reaction method. Identify the oxidizing agent and the reducing agent in each. (a) VO2 + (aq) + Cr(OH)3(s) → CrO4 2−(aq) +...
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Chemistry
07/03/23
Balancing equations
Balance the following equations for reactions in acidic solution by the half-reaction method. Identify the oxidizing agent and the reducing agent in each.(a) Cr2O7 2−(aq) + HS− (aq) → Cr3+(aq) +...
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Chemistry
07/02/23
General Phase Change question
Two 20.0 g ice cubes at −20.0 ∘C−20.0 ∘C are placed into 295 g295 g of water at 25.0 ∘C.25.0 ∘C. Assuming no energy is transferred to or from the surroundings, calculate the final...
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