02/17/21

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The following data were collected for three compounds in aqueous solution. Determine the value of the van’t Hoff factor for each salt. (Kf for water is 1.86°C/m) for the experimentally measured ΔTf... more
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02/17/21

If 1.025 g of unknown solute is added to 4.568g of lauric acid and the sloution is found to have a molality of 1.81 m, How many moles of solute are in the solution?
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02/17/21

If a solution of 1.00g of unknown solute is added to 9.116 g of steric acid and the solution freezes at 63.6 oC, What is the molality of the solution
( Normal FP steric acid = 68.88oC and Kf = 4.50 oC/m )
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02/17/21

Determine the number of grams of strontium hydroxide that can be dissolved in 421.07 mL of distilled water to make a saturated solution of Sr(OH)2 (Ksp = 3.2 x 10-4)
Determine the number of grams of strontium hydroxide that can be dissolved in 421.07 mL of distilled water to make a saturated solution of Sr(OH)2 (Ksp = 3.2 x 10-4)
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02/17/21

an isotope has half-life of 8 hours. how many grams of a 140 gram sample of this material will remain after 16 hours 
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02/17/21

If 240 mL of an aqueous solution containing 1.67 g of an unknown covalent solid at 25oC gives rise to an osmotic pressure of 497 mmHg, what is the molar mass (g/mol) of the unknown?
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02/17/21

Calculate the amount if heat required to heat 65 kg sample of ethanol from 11 degrees Celsius to 19 degrees Celcius

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02/16/21

chemistry question help
If a solution of phosphoric acid has a molarity of 0.710, how many moles are present in 916.6 milliliters of the solution?Answer value
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02/16/21

chemistry molarity

If A solution of phosphoric acid has a molarity of 0.307, how many moles are present in 553.7 mL of the solution?
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02/16/21

How many grams of sodium iodide, NaI, must be used to produce 23.3 g of iodine, I2?

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02/16/21

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Determine the boiling point elevation is a solution of 124.0 mg of carvone (a.k.a oil of spearmint, C10H14O) dissolved in 1.44 g of carbon disulfide (Kb= 2.34°C/m).I have tried to work this so many... more
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02/16/21

What is the percent of iron in iron (II) hydroxide? (round your answer to 3 sig figs)
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02/16/21

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What is the molality of a solution prepared by dissolving 81.4g of ethylene glycol, HOCH2CH2OH, in 1.50 L of water? Assume the density of water is 1.00 g/mL.
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02/16/21

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Calculate the vapor pressure at 85.0°C of a solution prepared by dissolving 0.600 mol of liquid dibromoethane (C2H4Br2, Po=127 torr) in 1.80 mol of liquid dibromopropane (C3H6Br2, Po= 173 torr).Can... more
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02/16/21

NaHCO3 → NaOH + CO2

Baking soda decomposes in heat according to this balanced equation: NaHCO3 → NaOH + CO2if 25 grams of NaHCO3 decomposes in this reaction, how many grams of sodium hydroxide should be produced?If... more
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02/16/21

If 10.0 g of Al2(SO3)3 is reacted with 10.0 g of NaOH…
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02/16/21

Heat of vaporization help?
A certain liquid has a vapor pressure of 92.0 Torr at 23.0 ∘C and 366.0 Torr at 45.0 ∘C. Calculate the value of Δ𝐻∘vap for this liquid and the boiling point.
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02/16/21

If your numbers are precise but inaccurate, does it mean it might have been instrumental error?
For my lab, I got an average of 8% error, all numbers close to each other. A question asks which was the possible major source of error. Since the numbers are precise but inaccurate, would this... more
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02/16/21

For a certain reaction, K⁰ = 1.2 × 104 at 25 °C, and K⁰ = 4.3 × 103 at 125 °C
12. For a certain reaction, K⁰ = 1.2 × 104 at 25 °C, and K⁰ = 4.3 × 103 at 125 °C. (a) Is this reaction endothermic, or is it exothermic? (b) Calculate ΔHr⁰.14. For the reaction in exercise 12,... more
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02/16/21

At a certain temperature, an equilibrium mixture in a 1.00 L container consists of 0.00400 M PCl5(g), 0.100 M PCl3(g), and 0.200 M Cl2(g).

6.) At a certain temperature, an equilibrium mixture in a 1.00 L container consists of 0.00400 M PCl5(g), 0.100 M PCl3(g), and 0.200 M Cl2(g). (a) Calculate KC for PCl5(g) ⇌ PCl3(g) + Cl2(g); (b)... more
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02/15/21

What is the activation energy (in kJ/mol)
What is the activation energy (in kJ/mol) of a reaction whose rate constant increases by a factor of 87 upon increasing the temperature from 308 K to 347 K? R = 8.314 J/(mol • K). Only enter the... more
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02/15/21

help on chemistry

What can successive ionization energies tell us about the numberof valence electrons in an atom?
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02/15/21

Please help me with this Chemistry question.
Which substance from the list would you expect to have a higher melting point, and why?NH3MgCl2SF6C6H12O6
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02/15/21

Please help me with this Chemistry question

A deep underground cavern contains 3.05 x 106 L of methane gas (CH4) at a pressure of 1.6 x 103 kPa, and a temperature of 312 K. How many kilograms of methane does the cavern contain? Please show... more
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02/15/21

At a certain temperature, an equilibrium mixture in a 1.00 L container consists of 0.245 M H2(g), 0.199 M I2(g), and 1.563 M HI(g).

(a) Calculate KC for H2(g) + I2(g) ⇌ 2HI(g); (b) An additional 0.500 mol of H2(g) is added to the container. Calculate the new equilibrium concentrations.
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