12/08/19

Water has a Kf of 1.86C/m and Kb of 0.51C/m. What will be the new freezing point of a 1.5 m solution of potassium phosphate?
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12/08/19

College Chemistry 1 Question
When a 45 g sample of an alloy at 100ºC is dropped into 100.0 g of water at 25.0ºC the final temperature is 37.0ºC. What is the specific heat of the alloy?
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12/08/19

Which is the relationship between Ksp and molar solubility, x, for Fe(OH)3?
answer choicesKsp= x^2Ksp= 4x^3Ksp= 27x^4Ksp= 108x^5None of these
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12/08/19

How many mL of 0.200M Ca(OH)2 are required to neutralize 50.0mL of 0.500M HNO3
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12/08/19

How many mL of 0.500M KOH are required to completely neutralize 25.00mL of 0.100 M H3PO4
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12/07/19

College Chemistry - How to find the molar mass without the grams given
Determine the molar mass of an unknown if you dissolve enough of the unknown into Benzene to make a 1.55% mass percent mixture of unknown to benzene and find that the boiling point of... more
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12/07/19

A student has 100.mL of 0.20 M HCl. She takes 5.0 mL of this solution and adds it to 10.0 mL of water. She then takes 3.0 mL of this new solution. What is the concentration of this solution?
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12/07/19

If a 0.100 M solution of potassium sulfate has an osmotic pressure at 25.0C, what is the i value for the solution?
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12/07/19

If a small weather balloon with a volume of 44.0 L at a pressure of 1.00 atmosphere was deployed at the edge of Typhoon Odessa, what was the volume of the balloon when it reached the center?
The severity of a tropical storm is related to the depressed atmospheric pressure at its center. In August 1985, Typhoon Odessa in the Pacific Ocean featured maximum winds of about 90 mi/hr and... more
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12/06/19

The vaporization of 1 mole of liquid water (the system) at 100.9°C, 1.00 atm, is endothermic.
H2​O(l)+40.7kJH2​O(g)Assume that at exactly 100.0°C and 1.00 atm total pressure, 1.00 mole of liquid water and 1.00 mole of water vapor occupy 18.80 mL and 30.62 L, respectively.Calculate the work... more
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12/06/19

A 109.2 mL sample of 1.00 M NaOH is mixed with 54.6 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 22.65 °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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12/06/19

How many half-lives occurred if 5.2 x 10^24 atoms of Pb-212 decay into 0.54 miles of Bi-212? Round to nearest whole number.
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12/06/19

If you have 2.1x10^23 atoms of Aluminum, then what pressure (in atm) of hydrogen gas at 10C in a 7.50 L container can be made?
Balanced Equation: 6 HNO3 + 2 AL ---> 2 AL(NO3)3 + 3 H2
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12/06/19

biochem amino acids question

which of the following tripeptides is most hydrophobic: a) gly-ser-therb) gly - val - alac)phe-val-isod)arg-lys-methe)ser-iso-leuI am leaning more towards B but I want to know the correct answer... more
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12/06/19

How may molecules are in .20 moles of H2O
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12/06/19

chemistry TLC plate

1)    Bob the chemist ran a TLC plate of his product, but the spot would not move off the baseline. The eluent he used consisted of a 30% polar / 70% non-polar solvent system.  Which solvent system... more
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12/05/19

determine the oh-

Determine the [H+] , [OH−] , and pH of a solution with a pOH of 3.52 at 25 °C.
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12/05/19

The specific heat of a certain type of cooking oil is 1.75 J / ( g ⋅ ° C ) . How much heat energy is needed to raise the temperature of 2.24 kg of this oil from 23 ° C to 191 ° C?
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12/05/19

How many moles of the sugar sucrose (C12H22O11) are needed to produce 18.0 moles of solid carbon? C12H22O11 (s) → 12C(s) + 11H2O (g)

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12/05/19

Consider the following balanced chemical equation: CS2(g) + 3O2(g) → CO2(g) + 2SO2(g) Determine the mass (in g) of SO2 formed if 466 g of CS2 reacts with 466 g of O2
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12/05/19

Consider the following balanced chemical equation: 2Cu2O(s) + O2(g) → 4CuO(s) Determine the mass (in g) of CuO formed if 27.1 g of Cu2O reacts with 27.1 g of O2.
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12/05/19

If 10.0 g of sodium sulfite is dissolved in 1.00 kg of water to yield a concentration of 1.06 g/mL, calculate the concentration of the solution
using molarity, molality, percent by mass, mole fraction
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12/05/19

If 3.0x10^23 atoms of sodium and 250 mL of 3.0 M HCl solution react to give 4.9L of a gas at 25C and 760 torr, what is the percent yield of that gas?
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12/05/19

Chemistry Math Question 5
Calculate the change in Gibbs free energy when 50 mg of liquid bromine dissolves in aqueous solution at 29 C. SubstanceΔfH0 kJ/molS0 J/mol K Br2(l) 0.0 152.2 Br2(aq) -2.6 130
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12/05/19

Chemistry Math Question
A steel railroad bridge uses a zinc sacrificial anode to limit the extent of oxidation of the steel. If a 8 kg anode is completely ozidized to Zn2+ over the course of 17.2 years, compute the... more
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