07/10/23

0.700 moles of an unknown solid is placed into water to make 150.0 mL of solution. The solution's temperature decreases by 6.11 °C. Calculate ∆H, in kJ/mol, for the dissolution of the unknown solid.

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07/09/23

Container A contains 1.00 mole of Xe gas and Container B contains 1.00 mole of He gas. Both gases are at 100.0 °C. How much faster will the He diffuse than Xe?
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07/07/23

how many mmol are in 1 mL of sulfuric acid
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07/05/23

Average atomic mass problem
An element consists of three isotopes. The abundance of one isotope is 92.21% and its atomic mass is 27.97693 amu. The abundance of the second isotope is 4.70% and its atomic mass is 28.97649 amu.... more
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07/03/23

Balancing Equations
Balance the following equations for reactions in basic solution by the half-reaction method. Identify the oxidizing agent and the reducing agent in each. (a) VO2 + (aq) + Cr(OH)3(s) → CrO4 2−(aq) +... more
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07/03/23

Balancing equations
Balance the following equations for reactions in acidic solution by the half-reaction method. Identify the oxidizing agent and the reducing agent in each.(a) Cr2O7 2−(aq) + HS− (aq) → Cr3+(aq) +... more
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07/02/23

General Phase Change question
Two 20.0 g ice cubes at −20.0 ∘C−20.0⁢ ∘C are placed into 295 g295 g of water at 25.0 ∘C.25.0⁢ ∘C. Assuming no energy is transferred to or from the surroundings, calculate the final... more
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07/02/23

Calculating a molecular formula from mass of composition
2.24 g of iron combines with 0.96 g of oxygen to form an oxide of iron.Determine the formula of this oxide of iron and use it to complete the balanced equation.(relative atomic masses: Fe = 56.0, O... more
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06/30/23

chemistry Problem
Calculate the concentration of each ion in the solutions made by mixing the following pairs of solutions. Assume no precipitate forms yet, and assume all volumes are additive. (a) 100.0 mL each of... more
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06/29/23

acid and base equilibria
1) Calculate the pH of the resulting solution when 100.0 mL of 0.2 M HNO2 is titrated by 0.1 M NaOH aftera) 0 mL of NaOH has been added.b) 100 mL of NaOH have been added.c) 150 mL of NaOH have been... more
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06/24/23

The reaction C4H8(g)⟶2C2H4(g) has an activation energy of 262 kJ/mol. At 600.0 K, the rate constant, 𝑘, is 6.1×10−8 s−1. What is the value of the rate constant at 830.0 K?
The reactionC4H8(g)⟶2C2H4(g)C4H8(g)⟶2C2H4(g)has an activation energy of 262 kJ/mol.262 kJ/mol. At 600.0 K,600.0 K, the rate constant, 𝑘,�, is 6.1×10−8 s−1. What is the value of the rate constant... more
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06/24/23

Chemistry gas calculations
Three gases (8.00 g of methane, CH4, 18.0 g of ethane, C2H6, and an unknown amount of propane, C3H8) were added to the same 10.0-L container. At 23.0 ∘C, the total pressure in the container is... more
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06/24/23

chemistry questions
A 12.1912.19 g sample of a compound contains 3.893.89 g of potassium, K,K, 3.533.53 g of chlorine, Cl,Cl, and oxygen, O.O. Calculate the empirical formula. Insert subscripts as needed.Empirical... more
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06/23/23

How do you figure out the empirical formula between these two ions
How do I put Sn^4+ and ClO2- into an empirical formula.
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06/23/23

Determine the electron pair shape and molecular structure

Determine the electron pair shape and molecular structure of the following molecules. Also, indicate if the molecule is polar or nonpolar. A. PF3B. SeBr4C. H2SD. AsH3E. SiH4
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06/22/23

Calculate the mass of(NH2)2CO that could theoretically be formed by this reaction.
Sorry, I could not add a comment,... more
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06/22/23

Calculate the mass of(NH2)2CO that could theoretically be formed by this reaction.
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06/21/23

How do you figure out this question?
Gaseous butane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water . suppose 2.32 g of butane is mixed with 14. g of oxygen. calculate the minimum mass of butane that... more
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06/19/23

Complete and balance the following redox reaction in basic solution:
Complete and balance the following redox reaction in basic solution: 7O3-(aq) + Re(s) ===> ReO4-(aq) + IO-(aq)Thanks!
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06/19/23

Why can't I take 3s2 more stable than 3p4?
Outermost electronic configuration of 4 elements A, B, C, D A-3s2, B-3s23p1, C-3s23p3, D-3s23p4 Correct order of 1st ionization enthalpy (a) B > A > C > D (b) D > C > B > A (c) C... more
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06/18/23

what type of reaction happens when you mix sodium thiosulphate solution and hydrochloric acid?
please help
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06/18/23

Calculate the volume of nitric acid (65%, density=1.40g/cm3) and how cm3 H2O need to added 500cm3 solution 0.2mol/dm3.Calculate the quantitative participation(Xa=nA/nA+nB) of the initial solution.
I need a quick response!Thanks for your attention.
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06/16/23

how many ml of 50% acid should be added to 100% acid to get 20 ml of 70% acid
how many ml of 50% acid should be added to 100% acid to get 20 ml of 70% acid
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06/15/23

find the enthalpy change
Use equations (1), (2), and (3) to find the enthalpy change for the formation of methane, CH 4 , fromchloroform, CHCl 3 . CHCl 3 (l) + 3HCl(g) → CH 4 (g) + 3Cl 2 (g)(1) 1/2 H 2 (g) + 1/2 Cl 2 (g) →... more
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06/15/23

Determine the ∆��rxn for the neutralization and write a thermochemical equation for the reaction.
A chemist mixes 25.0 ml of 1.0 mol/L diprotic acid H2X (aq) with 50 ml.0 of 1.0 mol/L NaOH(aq) in acoffee cup calorimeter. Both solutions are initially at 25.0℃. The temperature stabilizes to 33.9... more
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