10/15/23

beers law problem
During an experiment, a chemistry student collects absorbance vs concentration data for different concentrations of a salt solution at 490 nm. the experiment is run using a 1.00 cm diameter cuvette... more
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10/15/23

Chemistry ICE Table
Determine the number of grams of NH4Br needed to prepare an aqueous solution at a specific pH by constructing an ICE table, writing the equilibrium constant expression, and using this information... more
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10/15/23

A 165.0 ml solution of 2.724M strontium nitrate is mixed with 215.0ml of a 3.120M sodium fluoride solution. Calculate the mass of the resulting strontium fluoride precipitate.
Assuming the complete precipitation, calculate the final concentration pf each ion. If the ion is no longer in solution, enter a 0 for the concentration.
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10/15/23

Calculate the equilibrium partial pressures of the reactants and products if the initial pressures are PPCl5 = 0.4200 atm and PPCl3 = 0.4950 atm.
For the reaction below, Kp = 25.5 at 800 K.PCl5 (g) --> PCl3 (g) + Cl2 (g)Calculate the equilibrium partial pressures of the reactants and products if the initial pressures are... more
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10/15/23

Determine the equilibrium concentration of H2O if the starting concentrations of both reactants are 0.004325 M, with [HOCl]o = 0.000 M.
The value of Kc for the reaction between water vapor and dichlorine monoxide is 0.0900 at 25°C.H2O (g) + Cl2O (g) --> 2HOCl (g)Determine the equilibrium concentration of H2O if the... more
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10/15/23

Chemistry Chapter 8
A gas sample has a volume of 0.203 LL with an unknown temperature. The same gas has a volume of 0.202 LL when the temperature is 37 ∘C∘C, with no change in the pressure or amount of gas.A. What was... more
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10/15/23

Calculate the volume of 0.200 M NaOH (in mL) needed to completely react with 50.00 mL of 0.0500 M CH3COOH. Do not include units in your typed answer.
Calculate the volume of 0.200 M NaOH (in mL) needed to completely react with 50.00 mL of 0.0500 M CH3COOH. Do not include units in your typed answer.
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10/15/23

determining enthalpy of the reaction
Consider these reactions, where M represents a generic metal. 1. 2M(s) + 6HCl(aq) --- 2MCl3(aq) + 3H2(g) delta H1= -941.0 kJ 2. HCl(g) --- HCl (aq) delta H2= -74.8 kJ 3. H2(g) +Cl2(g) --- 2HCl(g)... more
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10/14/23

help me please and thank you
How many molecules (not moles) of NH3NH3 are produced from 1.76×10−4 gg of H2H2?
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10/14/23

Limiting Reactants: Compare Reactants Moles

Using the amount of the limiting reactant, what is the maximum amount of product Zn(OH)2 in moles, that can form? Amount ZnO = 0.224 mol
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10/14/23

why do we keep insoluble salts, weak acids, weak base not in ion form when writing net ionic equation but do show them separate when we are just talking about the substance
for example AgCl is insoluble salt but would write it as AgCl <-> Ag+ +Cl- in equation form , however would just keep it as AgCl in a net ionic equation.
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10/14/23

how to know a compound is amphoteric?
How do I know a compound is amphoteric? I know the definition Is it either lose or gains an H+, but how do I identify it in for example the following compounds?CH3NH2HSO4-CN-H3O+
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10/14/23

What is the percent ionization of a monoprotic weak acid solution that is 0.131 M? The acid-dissociation (or ionization) constant, Ka, of this acid is 4.92 x 10-10.
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10/14/23

Assume that the heat capacity of the calorimeter equals the heat capacity of the water it contains. Calculate the specific heat capacity of the metal and use the result to identify the metal.
A 44.0 g sample of an unknown metal at 100.0 °C is placed in a constant pressure calorimeter containing 80.0 g of water at 24.8 °C. The final temperature is 28.4 °C. Assume that the heat capacity... more
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10/14/23

Calculate the [H+] and pH of a 0.0040 M hydrofluoric acid solution. The Ka of hydrofluoric acid is 6.80 × 10-4. Use the method of successive approximations in your calculations.
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10/12/23

does a reaction occur when aqueous solutions of sodium sulfate and potassium carbonate are combined
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10/12/23

does a reaction occur when aqueous solutions of nickel to nitrate in aluminum Sophie are combined
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10/12/23

Calculate the [H+] and pH of a 1.57 × 10-4 M acetic acid solution. The Ka of acetic acid is 1.76 × 10−5.
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10/11/23

chemistry law gas
How many grams of Ag 2 O Ag 2 ​ O Subscript 2 Baseline upper O are required to produce 1.15 L oxygen gas via decomposition at 102.3 kPa and 175°C? Use the ideal gas law to calculate moles of O₂.... more
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10/10/23

What is the pH of a 0.32 M solution of HC6H6O6- ? a. 4.10b. 11.80c. 7.95d. 3.85
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10/09/23

How much heat was released by the solution? What is the enthalpy of the reaction?
Potassium nitrate, KNO3, has a molar mass of 101.1 g/mol. In a constant-pressure calorimeter, 34.1 g of KNO3 is dissolved in 279 g of water at 23.00 °C.KNO3(s)−→−−H2OK+(aq)+NO−3(aq)The temperature... more
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10/09/23

Mass of precipitate formed when 3.75 L of 0.0570 M Ba(OH)2 is mixed with 3.25 L of 0.0782 M Na2SO4

When 3.75 L of 0.0570 M Ba(OH)2 is mixed with 3.25 L of 0.0782 M Na2SO4 a precipitate is formed. Write a balanced equation for this reaction (include the state of the reactants and products) and... more
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10/09/23

Concentration of ethanol as a mass percent.

Cask wine is available in a range of alcohol concentrations. Hardy's cask wine chardonnay contains 13.0% ethanol by volume. Calculate the concentration of ethanol as a mass percent. The density of... more
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10/09/23

If a gas mask contained 35.55 g of KO2 and 5.4 g of water, what amount of oxygen (in grams) could be produced?

Potassium superoxide KO2 is used in rebreathing gas masks to produce oxygen. 4KO2 + 2H2O à 4KOH + 3O2If a gas mask contained 35.55 g of KO2 and 5.4 g of water, what amount of oxygen (in grams)... more
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10/08/23

how much heat is produced when 22.9 g of methanol reacts with 35.5 g of oxygen?
When methanol, CH3OH, is burned in the presence of oxygen gas, O2, a large amount of heat energy is released, as shown in the combustion reaction.CH3OH(g)+32O2(g)⟶CO2(g)+2H2O(l) ... more
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