02/18/22

What is the weight of a specimen (MW=56.1) in grams if the molarity of a 500 mL solution is 1.5 M?
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02/18/22

The solution is made up of a A, B, and C in 4:3:1 proportions. How much of each is present if the whole solution has a volume of 350 mL?
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02/18/22

What is the percent weight in weight strength if 50 grams of NaCl is dissolved in 300 mL of solvent with specific gravity of 1.2?
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02/18/22

The reaction A + 2B + C → Products has a rate law of Rate = k[A]²[B]. By what factor would the reaction rate change if [C] is tripled?
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02/18/22

Using the information in the table, the value of the rate constant for the reaction 2 A(g) + B(g) → C(g) + D(g) is
A0(M). B0(M). Rate (M/s).100. 2.50 .460.200. 2.50 .920.300 1.25 1.38
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02/17/22

A compound contains 28.9% sodium, 7.53% carbon and 30.2% oxygen. Calculate its empirical formula.
A compound contains 28.9% sodium, 7.53% carbon and 30.2% oxygen. Calculate its empirical formula.
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02/17/22

The half-life for the zero order reaction A → Products is 276 s. What is the value of the rate constant for the reaction if the initial concentration of A is 0.459?
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02/17/22

Balanced equations
For the balanced equation shown below, how many grams of CO would be produced by 72.0 grams of O2? C3H6+3O2 → 3CO+3H2O
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02/17/22

175.08 Ib equivalent to kg
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02/17/22

Dilution Problem
How would you prepare 500 mL of 0.33 M solution of CaCl2 from solid CaCl2? Specify the glassware that would be used.
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02/17/22

Using the provided table, determine the molar enthalpy (in kJ/mol) for the reaction C(s) + CO₂ (g)→ 2 CO (g)
Substances given in provided table= C (s) = 0 KJ/molCO₂ (g) = -393.5 KJ/molCO = -110..5 KJ/mol
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02/17/22

What is the final temperature when 50.0 mL of 0.100 M hydrochloric acid solution at 20.0 oC is neutralized by 50.0 mL of 0.100 M sodium hydroxide solution at 20.0 oC ?
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02/17/22

Chemistry II boiling point of solution

The boiling point of pure ethanol (C₂H₅OH, MM = 46.07 g/mol) is 78.4 °C. A solution is made using 100.0 g of ethanol (the solvent) and 12.1 g of glucose (MM = 180.16 g/mol). What is the boiling... more
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02/16/22

what is the mass
A 0.8053-g sample of an unknown monoprotic acid is dissolved in water and titrated with standardized sodium hydroxide. The equivalence point in the titration is reached after the addition... more
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02/16/22

what is the volume
In the laboratory, a student dilutes 28.5 mL of an 8.57 M hydrobromic acid solution to a total volume of 200. mL. What is the concentration of the diluted solution?
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02/16/22

Chemistry question help
For the following reaction, 163 grams of zinc oxide are allowed to react with 18.0 grams of water. ZnO (s) + H2O (l) Zn(OH)2 (aq) What is the FORMULA for the limiting reagent? What is the... more
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02/16/22

The activation energy, Ea, for a particular reaction is 13.6 kJ/mol. If the rate constant at 754 °C is 24.5/min, at what temperature (in °C) will the rate constant be 20.1/min? (R = 8.314 J/mol • K)
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02/16/22

What is the frequency in Hertz of a photon emitted after an electron transitions from n=6 to n=2?

(Hint: You first need to find the energy and then the frequency) (show your calculations)
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02/16/22

Balanced equations

For the balanced equation shown below, how many grams of KClO3 reacted, if 9.52 grams of KCl are produced? 2KClO3 → 2KCl+3O2
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02/16/22

Closed gas system
A closed gas system initially has volume and temperature of 6420mL and 66.00 oC with the pressure unknown. If the same closed system has values of 1220torr, 9610mL and 207.0 oC, what was the... more
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02/16/22

Calculate the volume where you expect the equivalence point to be for the titration between sodium bicarbonate and hydrochloric acid using the following data.
Acid-Base Titration 1. Calculate the volume where you expect the equivalence point to be for the titration between sodium bicarbonate and hydrochloric acid using the following data. Mass of NaHCO3:... more
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02/16/22

Please help! Dilution equation.
You have diluted 2.00mL of 4.70mM iodine solution to a total volume of 8.00mL with acetone, acid, and water. It has taken 4.02 minutes for all of the colors to disappear. What is the rate of this... more
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02/16/22

If you knew the number of valence electrons in a nonmetal atom, how would you determine the valence of the element? (Hint: Ignore hydrogen for now.)
Could you please simplify this question and explain how to get the answer? Thank you!
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02/16/22

Which of the following molecules has the lowest viscosity?
Which of the following molecules has the lowest viscosity?a. methanolb. glycerolc. methaned. water 2. The boiling point of methane (CH4) is much lower than that of hydrogen fluoride (HF)... more
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02/15/22

Bromine monochloride is synthesized using the reaction Br2(g)+Cl2(g)↽−−⇀2BrCl(g)𝐾p=1.1×10−4 at 150 K

A 207.0 L flask initially contains 1.092 kg of Br2 and 1.088 kg of Cl2. Calculate the mass of BrCl , in grams, that is present in the reaction mixture at equilibrium. Assume ideal gas... more
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