04/28/23

Bond Enthalpy & Enthalpy of a Reaction
N2 + 3H2 --> 2NH3a. What change in energy is required to make 1.00 mol of NH3?b. What change in energy is required to make 1.00 gram of NH3?c. What change in energy is required to use up 2.34g... more
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04/28/23

Chemistry related

The addition of a catalyst in a chemical reaction (A) increases the concentration of products at equilibrium. (B) increases the fraction of reactant molecules with a given kinetic energy. (C)... more
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04/28/23

Chemistry related question

Which is not a characteristic of ionic substances?(A) Their reactions are generally extremely slow. (B) They conduct an electric current when fused. (C) Those having a common ion exhibit some... more
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04/27/23

What is E at 25 °C for the reaction described by Zn(s) | Zn²⁺ (0.10 M) || Cu²⁺ (1.00 M) | Cu(s)? The standard cell potential for the reaction is +1.100 V.
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04/27/23

For the galvanic (voltaic) cell Fe(s) + Mn²⁺(aq) ⟶ Fe²⁺(aq) + Mn(s) (E° = 0.77 V at 25 °C), what is [Fe²⁺] if [Mn²⁺] = 0.040 M and E = 0.78 V? Assume T is 298 K
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04/27/23

12 g of dry ice (solid CO_2) is placed in a 7000 cm^3 container, then all the air is quickly pumped out and the container sealed. The container is warmed to 0∘C, a temperature at which CO_2 is a gas.
What is the gas pressure? Give your answer in atm.The gas then undergoes an isothermal compression until the pressure is 2.8 atm , immediately followed by an isobaric compression until the volume... more
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04/27/23

At a certain temperature, 0.3611 mol of N2 and 1.741 mol of H2 are placed in a 3.50 L container.

At a certain temperature, 0.3611N2 and 1.741 mol of H2 are placed in a 3.50 L container.N2(g)+3H2(g)↽−−⇀2NH3(g)At equilibrium, 0.1401 mol of N2 is present. Calculate the equilibrium constant, 𝐾c
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04/27/23

Colligative Properties
Is this which salt would be better to de-ice a sidewalk NaCL or CaCl^2 and why ?
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04/27/23

A Zn wire and Ag/AgCl reference electrode (E° = 0.197 V) are placed into a solution of ZnSO4.
The Zn wire is attached to the positive terminal and the Ag/AgCl electrode is attached to the negative terminal of the potentiometer. Calculate the [Zn2+] in the solution if the cell... more
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04/27/23

Colligative properties
Which solution will have the highest boiling pointso, I know that solutions have higher boiling points than pure solvents.1 molal NaOH2 molal C^5H^11OH0.5 molal Mg^3N^2what is an electrolyte and... more
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04/26/23

Question In Description
3. A sample of aluminunm that weighed 0.050 g reãcted with excess 6.0 M HCI. Ả volume of48.3 mL of H, gas was collected over water at 22.0°C and at an atmospheric pressure of 751 mmHg. Calculate... more
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04/26/23

What element in the same group as polonium has a lesser electronegativity?
What element in the same group as polonium has a lesser electronegativity?  oxygen  selenium  sulfur  tellurium  none of the above
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04/26/23

The most common ion for lead has a charge of 4+. What element in the same period as lead has a larger ionic radius?
The most common ion for lead has a charge of 4+. What element in the same period as lead has a larger ionic radius?  hafnium  rhenium  thallium  tungsten  none of the above
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04/25/23

The reaction A + 2B + C → Products has a rate law of Rate = k[A]²[B]. By what factor would the reaction rate change if [A] is tripled?
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04/25/23

Chemistry 11 grade
What is pH of 2.2x 10^-3 M of NaOH ? What is pOH of 3.6 x10^-4M of H2SO4 ? What is pH of 2.98 x10^-2M of HCl ?Whay is pOH a 6.97 x 10^-5 M of KOH ?
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04/25/23

Gibbs Free Energy
The ∆G° of vaporization for benzene at 298 K and 1.00 atm is 4.883 kJ/mol. Calculate the pressure, in atm, of benzene vapor in equilibrium with benzene liquid at 298 K.
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04/25/23

Gibbs Free Energy
What is ∆G° for the reaction CaO(s) + CO₂(g) → CaCO₃(s)? (kJ/mol)CaO = ∆G°f = -604 (kJ/mol)CO₂ = ∆G°f = -394.4 (kJ/mol)CaCO₃ = ∆G°f = -112.8 (kJ/mol)
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04/25/23

Solution Concentration

(1)To make 1 liter of a 0.47 molar solution of sodium nitrate,NaNO^3, you add 0.47 moles to a volumetric flask. How many grams of NaNO^3 should you add? How much water should you add?(2)To make... more
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04/25/23

Normality of acids is also related to equivalents, comparing an acid's potential proton donating to a monoprotic strong acid. What is the Normality of 5M H2S?
CRB Normality of acids is also related to equivalents, comparing an acid's potential proton donating to a monoprotic strong acid. What is the Normality of 5M H2S?(A) 5 N(B) 2.5 N(C) 10 N(D) 15 N
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04/25/23

You have 8.32 g of P4(s) and 3.22 g of Cl2. Considering the following unbalanced equation, how much PCl3 will be produced: P4 + Cl2 -> PCl3
You have 8.32 g of P4(s) and 3.22 g of Cl2. Considering the following unbalanced equation, how much PCl3 will be produced: P4 + Cl2 -> PCl3(A) 4.12 g(B) 1.82 g(C) 0.27 g(D) 15.78 g
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04/25/23

How many grams of Magnesium would need to be used to donate as many electrons as 50g of Sodium (
CRB Equivalents are related to limiting reagents, because using a different compound means a different mass needs to be used to have the same effect (whether in buffering, electrons to donate or... more
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04/25/23

Chem- periodicity and ionic bonds

Consider an ionic compound, MX2, composed of generic metal M and generic, gaseous halogen X.The enthalpy of formation of MX2 is Δ𝐻∘f=−987 kJ/mol. The enthalpy of sublimation... more
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04/24/23

What is the pH of a solution of 0.300 M HNO₂ containing 0.120 M NaNO₂? (Ka of HNO₂ is 4.5 × 10⁻⁴)
Note the presence of an acid and a salt of its conjugate base in the solution. To solve this problem, you will need to plug the appropriate pKa value into the Henderson-Hasselbalch equation.
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04/24/23

Rates of Decay Reactions
The half-life of cesium-129 is 32.0 hours. How much time is required for the activity of a sample of cesium-129 to fall to 10.4 percent of its original value?
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04/24/23

Determine the molarity of a solution that is prepared by dissolving 60 grams of LiBr in 500 mL of solution.

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