10/02/21

solving a reactant using a chemical equation
Wine goes bad soon after opening because the ethanol CH3CH2OH in it reacts with oxygen gas O2 from the air to form water H2O and acetic acid CH3COOH, the main ingredient of vinegar. What mass of... more
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10/02/21

Solving moles-to-moles limiting reactant problems
hydrogen H2 gas and oxygen O2 gas react to form water H2O vapor. Suppose you have 3.0 mol of H2 and 11.0 mol of O2 in a reactor.Calculate the largest amount of H2O that could be produced. Round... more
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10/02/21

The balanced combustion reaction for C6H6 is 2C6H6(l)+15O2(g)⟶12CO2(g)+6H2O(l)+6542 kJ

If  6.200g C6H6 is burned and the heat produced from the burning is added to 5691g of water at 21C, what is the final temperature of the water?
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10/01/21

chemistry question I dont get
Helium-oxygen mixtures are used by divers to avoid the bends and are used in medicine to treat some respiratory ailments. What percent (by moles) of He is present in a helium-oxygen mixture having... more
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10/01/21

chemistry question I dont get
Typically, when a person coughs, he or she first inhales about 2.00 L of air at 1.00 bar and 25 ∘C. The epiglottis and the vocal cords then shut, trapping the air in the lungs, where it is warmed... more
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10/01/21

If I have an unknown quantity of gas held at a temperature of 1195 K in a steel tank with a volume of 25 liters and a pressure of 560 atm, how many moles of gas do I have?
In the question above, it turns out the gas is Oxygen. How many grams of Oxygen is there
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10/01/21

Acid Base question
 An acetate buffer was prepared by dissolving 0.1 mol of acetic acid and 0.11 mol of sodium acetate in 1L of water. Suppose 25 mL of 0.1 M HCl is added to 100 mL of acetate buffer. What are pH... more
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10/01/21

How many grams of a sodium bromide will be produced if 38.7 grams of sodium hydroxide was consumed in the reaction
Reaction: 2NaOH(aq) + CaBr2(aq) ==> Ca(OH)2 + 2NaBr(aq)
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10/01/21

How many moles of CO(g) will be present when the system reaches equilibrium?

The following reaction has an equilibrium constant of 2.75 x 10-7 at a given temperature.HCHO(g) CO(g) + H2(g) If you have 0.75 moles of HCHO(g) in a 1.00L container, how many moles of CO(g) will... more
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10/01/21

Sealed flask with carbon dioxide. Need number of moles
You have a sealed 2 liter flask that contains nothing but water and carbon dioxide. The flask is half-filled with liquid water, has a temperature of 25°C, and the overall pressure within the flask... more
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10/01/21

Partial pressure for methane question
A large, sealed tank contains 1,500 liters of water. When you analyze the air in the top of the tank, you discover that it contains methane at a partial pressure of 0.07 atm. How many grams of... more
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10/01/21

You put 100 grams of water in the beaker, and then burn the marshmallow. The temperature goes up, as expected, from 20℃ to 40℃. How many calories were in the marshmallow?
How many calories where in a marshmallow?
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10/01/21

Sodium hydroxide reacts with calcium bromide to form a new metal hydroxide and sodium bromide
Balance the equation after.
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10/01/21

How many particles of calcium bromide will be needed to produce 2.2 moles of the metal hydroxide as based on the reaction?
Reaction:2NaOH(aq) + CaBr2(aq) ==> Ca(OH)2 + 2NaBr(aq)
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09/30/21

Why are some salts acidic when others are neutral?
Need some help explaining this.
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09/30/21

Explain why the conjugate base of a strong acid can’t react with water.
Is the answer because the conjugate base has no tendency to gain a proton?
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09/30/21

Match the following statements with the correct answer
In a polar covalent bond, electrons are shared ___________________.The type of bond formed between calcium and bromine is ________________The type of bond formed between phosphorus and fluorine is... more
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09/30/21

How many moles of atoms are in a 18.02E2 gram sample of water? Answer in exponential notation.
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09/30/21

Chemistry I HW 5
Write the condensed electron configuration for the manganese atom.When writing your answers, do not add spaces and do not try to italicize the orbitals.
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09/30/21

Molarity, Molality, and Mole Fraction
Home-distilled alcohol is tightly regulated in a city, and for good reason. Improper fermentation and distilling can result in significant concentrations of methanol (which is highly poisonous) in... more
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09/29/21

Theoretical Yield
What is the theoretical yield in grams of Ca(OH)2 if 2.04 g of KOH react with 3.02 g of CaCl2•2H2O as shown by the below equation?CaCl2(aq) + 2KOH(aq) → Ca(OH)2(s) + 2KCl(aq)In the part of the... more
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09/29/21

Chemistry question on ionic equations
A buffer solution of pH of 8.96 contains X mol of a weak base and Z mol of a salt of its conjugate acid. When 144 cm3 of a 0.0212 mol.dm−3 solution of hydrochloric acid was added to this buffer... more
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09/29/21

Mass and percent yield?
Pinacol rearrangement experiment: Measured benzopinacol (start) = 0.502 gCollected solid (end) = 0.480 gWhat would the start and final mass be in mol?What would the percent yield be?
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09/28/21

How many orbitals are described by each of the below combinations of quantum numbers? n = 3, ℓ =2 orbitals n = 4, ℓ = 2, mℓ = 2 orbitals

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09/28/21

pH question involving logs
To calculate the pH of a solution, you take the H+ ion concentration in the solution and plug it into the following equation: pH = –log[H+]. If the [H+] is 1.564*10^-8, what is the pH of the... more
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