03/18/21

A 99.2 mL sample of 1.00 M NaOH is mixed with 49.6 mL of 1.00 M H2SO4 in a large Styrofoam coffee cup; the cup is fitted with a lid through which passes a calibrated thermometer.
The temperature of each solution before mixing is 22.25 °C. After adding the NaOH solution to the coffee cup and stirring the mixed solutions with the thermometer, the maximum temperature measured... more
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03/18/21

A total of 22.6 kJ of heat energy is added to a 7.11 L sample of helium at 0.997 atm.

The gas is allowed to expand against a fixed external pressure to a volume of 23.4 L . Calculate the work done on or by the helium gas in units of joules, J.
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03/17/21

Chemistry: Stoichometry

Construct a BCA table based on the reaction below if 0.210 moles of C3H8 are combined with0.900 moles of O2.C3H8(g) + 5 O2(g) → 3 CO2(g) + 4 H2O(g)Calculate the mass of CO2 gas that should... more
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03/17/21

How many ounces of a 13% solution and a 42% solution must be combined to obtain 58 ounces of a 15% solution?
Need to know how many ounces of the 13% solution and how many ounces of the 42% solution separately. This is one part of the assignment that my online class did not go over. Thanks!
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03/17/21

How many C2H4 molecules are contained in 7.44x10^-18 mg of C2H4?

How many C2H4 molecules are contained in 7.44x10^-18 mg of C2H4? The molar mass of C2H4 is 28.05 g/mol.
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03/17/21

Determine the volume of hexane in ml
Determine the volume of hexane in ml that contains 9.19x10^22 molecules of hexane. The density of hexane is 0.6548 g/mL and its molar mass is 86.17 g/mol.
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03/17/21

2KClO3(s)= 2KCl(s) + 3O2(g)
PLEASE do not put the answer only. WRITE THE STEPS OF HOW YOU GET the answer with the LAWS!2KClO3(s)= 2KCl(s) + 3O2(g)The O2 gas formed is collected over water in a flask where the total pressure... more
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03/17/21

Chemistry Hw Help
Calculate the molality of a solution containing 3.22mol of NaCl dissolved in 420g of water.
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03/17/21

Neutral, Acidic, or Basic Salt
Determine if the following salt is neutral, acidic or basic. If acidic or basic, write the appropriate equilibrium equation for the acid or base that exists when the salt is dissolved in an aqueous... more
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03/17/21

Finding pOH of a solution
The pOH of 0.0280 M solution of Sr(OH)₂ isI tried doing -log(Molarity) and that did not work.I also tried taking the number I found from above and subtracting it from 14. I am thoroughly confused... more
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03/17/21

Setting Up an ICE Table
How many grams of NH₄Br must be dissolved in 1.00 L of water to produce a solution with pH = 5.16? The Kb of NH₃ is equal to 1.8 × 10⁻⁵.How would I set up an ICE table and solve for the mass of NH4Br? more
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03/17/21

Determining if Salt is acidic or neutral
Determine if the following salt is neutral, acidic or basic. If acidic or basic, write the appropriate equilibrium equation for the acid or base that exists when the salt is dissolved in aqueous... more
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03/17/21

Use the following reaction: Zn + 2HCl -> ZnCl2 + H2 If you are given 5.0 moles of Zn and 5.0 moles of HCl, which one is the limiting reactant?
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03/17/21

Consider the titration of a 60.0 mL of 0.365 M weak acid HA (Ka = 4.2 x 10⁻⁶) with 0.400 M KOH.
After 30.0 mL of KOH have been added, what would the pH of the solution be?
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03/16/21

pH values of solution x
Please help me with this quesions! I feel I have an overall understanding of everything but I am having trouble applying it to these...A student prepares a solution (Solution X) by dissolving 0.045... more
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03/16/21

Use Hess’ Law to determine the overall enthalpy change of each of the following (underlined) processes.
Use Hess’ Law to determine the overall enthalpy change of each of the following (underlined) processes.CS2(l)+3O2(g) --> CO2(g)+2SO2(g) H = ??? kj–––––––––––––––––––––––––––––––––C(s)+O2(g)... more
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03/16/21

chemistry hw help
Calculate the mass of solvent in kg of a solution containing 5.22 mol of solute having Kb 2.42 C/m and that its boiling point changed by 1.22 C when a solute was added.
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03/16/21

chemistry hw help
Calculate the molality of solution containing 4.63 mol of glucose dissolved in 650g of solvent. Then calculate the molal boiling point elevation constant if the boiling point elevated by 2.43 C.
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03/16/21

chemistry hw help
Calculate the boiling point elevation of a 2.33 molal solution where the solvent has a molal boiling point elevation constant of 5.46 C/m.
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03/15/21

Equivalence point
In a titration of 36.0 mL of a 0.250 M solution of a triprotic acid H₃PO₄ (phosphoric acid) with 0.600 M Ca(OH)₂, how many mL of base are required to reach the third equivalence point?
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03/15/21

CHEMISTRY !! help
A patient is injected with 7.08 μCi of radioactive iodine-131 with a half-life of 8.02 days. Assuming that 90.0% of the iodine ultimately finds its way to the thyroid, what decay rate (or activity)... more
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03/15/21

A 0.100 M solution of weak acid HA ionizes 2.00%. What will be its percent ionization if 10.0 mL of this solution is diluted with 30.0 mL of water?
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03/15/21

Please help me with this Chemistry question.

How do [H+] and [OH−] compare in a neutral aqueous solution? In an acidic solution?
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03/15/21

Determine the pH of a 0.10 M solution of (CH3CH2)2NH
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03/15/21

Which 1.0 molar solution will be the best conductor of electricity?
(1) NaCl(aq) (2) MgCl2(aq) (3) NaNO3(aq) (4) AlCl(aq)
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