At 1 bar, how much energy is required to heat 37.0 g of H2O(s) at −18.0 ∘C to H2O(g) at 119.0 ∘C?
q=
In: Chemistry
If a solution containing 39.142 g39.142 g of mercury(II) nitrate is allowed to react completely with a solution containing 10.872 g10.872 g of sodium dichromate, how many grams of solid precipitate will form?
precipitate:
How many grams of the reactant in excess will remain after the reaction?
excess reactant:
In: Chemistry
You add 7.25 g of ice at 0.00 C to 100 g of water at 80.0 C. What is the final temperature of the mixture at thermal equilibrium assuming no heat loss to the surroundings?
The specific heat capacity of liquid water is 4.184 J/gC and the enthalpy of fusion for water is 6.02 kJ/mol at 0.00C.
In: Chemistry
| Hydrogen peroxide, H2O2H2O2, is used to disinfect contact
lenses.
2H2O2(aq)→2H2O(l)+O2(g)2H2O2(aq)→2H2O(l)+O2(g) You may want to reference (Page) Section 6.1 while completing this problem. |
Part A How many milliliters of O2(g)O2(g) at 27 ∘C∘C and 5.00 barrbarr can be liberated from 18.95 mLmL of an aqueous solution containing 3.00%% H2O2H2O2 by mass? The density of the aqueous solution of H2O2H2O2 is 1.01g/mLg/mL. |
In: Chemistry
A reaction: A (aq) + B (aq) <-----> C (aq) has a standard free energy change of -3.05 kJ/mol at 25 C. What are the concentrations of A, B, and C at equilibrium if, at the beginning of the reaction, their concentrations are 0.30 M, 0.40 M, and 0 M, respectively?
A = ? M
B= ? M
C= ? M
How would your answer above change if the reaction had a standard free energy change of +3.05 kJ/mol?
A.) There would be no change to the answers.
B.) All concentrations would be higher.
C.) All concentrations would be lower.
D.) There would be more A and B, but less C.
E.) There would be less A and B, but more C.
In: Chemistry
Classify these bonds as ionic, polar covalent, or nonpolar covalent.
K-Cl, H-Br, H-H
In: Chemistry
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A certain substance X has a normal boiling point of 101.5°C and a molar boiling point elevation constant Kb = 1.49 °C/m. A solution is prepared by dissolving some urea (NH2)2CO in 200 g of X. This solution boils at 104.4°C. What is the mass of urea that was dissolved in the solution?
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The normal freezing point of a certain liquid Y is -8.70°C, but when 24.17g of urea (NH2)2CO are dissolved in 550 g of Y, it is found that the solution freezes at -13.7°C instead. Use this information to calculate the molal freezing point depression constant Kf of substance Y.
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In: Chemistry
A 25.00 mL aliquot of solution has a concentration of 3.813 x 10-5 M, what is the concentration of the 50.0 mL solution the aliquot was taken from?
In: Chemistry
1. In reviewing the Ontario Drinking Water Standards, how does your unknown compare with the standard? How much calcium chloride or distilled water would be needed to be added to make your sample compliant?
2.explain the process by which a water softener works, please include the regeneration process.
In: Chemistry
Given the following information, answer these questions.
P4(g) + 5 O2(g) → P4O10(s)
ΔG⁰298 = −2748 kJ/mol2 H2(g) + O2(g) → 2 H2O(l)
ΔG⁰298 = −474.2 kJ/molP4O10(s) + 6 H2O(l) → 4 H3PO4(l)
ΔG⁰298 = −349 kJ/mol
(a)
Determine the standard free energy of formation, ΔG⁰f (in kJ/mol), for phosphoric acid from this information.(Assume that ΔG⁰298 for all elemental substances is negligible.)
_______ kJ/mol
(b)
How does your calculated result compare to the value in the Standard State Thermodynamic Data table? Explain.
The listed value of ΔG⁰f (in kJ/mol) = _______ kJ/mol.
In: Chemistry
Calculate the voltage of the following cell at nonstandard conditions:
Cu | Cu2+ (0.150 M) || Cu2+ (.0120 M) | Cu
Convert your final answer to mV.
Group of answer choices
64.9 mV
-32.4 mV
-16.2 mV
32.4 mV
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How many molecules are contained in a 7.10-g sample of dimethylmercury?
What is the percentage of mercury (by mass) in the sample?
In: Chemistry
An extract from a toboacco leaves is completely miscible in water at temperatures below 60 C. What is the molality of a solution of this extract in water which freezes at -0.450 C. If this solution was obtained by dissolving 1.921 g of the extract in 48.92g of water, What is the molar mass of the extract? Combustion analysis of the extract yields 74.03% C, 8.70% H, and 17.27 % N by mass. What is the molecular formula of the extract?
In: Chemistry
You are provided with 5.05g of SO2 to react with 2.45 gg of O2. Indicate your theoretical yield by completing the following statements.
Match the chemical formulas and amounts in the left column to the appropriate blanks in the sentences on the right. Make certain each sentence is complete before submitting your answer.
The limiting reagent in the reaction is?
Regarding the theoretical yield based on the limiting reagent,(---------)mol of SO3 can be formed, which corresponds to a mass of ( --------)
The excess reagent was ( -------) and after the limiting reagent is consumed during the reaction, the mass of excess reagent remaining will be ( ----------)?
In: Chemistry
1. why does ruthenium have slow ligand exchange rate?
2. what effect does this have on cancer therapy - what are the benefits and negatives?
In: Chemistry