10/03/19

Finding Grams of Complete Reaction
I found the balanced equation : 4C + S8 = 4CS2, but I am confused about how to find the grams.Any help is greatly appreciated!Consider the following unbalanced reaction: C(s) + S8(s) → CS2(l) How... more
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10/03/19

A HCl is titrated with a NaOH solution of known concentration. How much volume of NaOH 0.120 M is necessary to neutralize 14.00 mL of HCl 0.500 M.
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10/03/19

Chemistry Class

A HCl is titrated with a NaOH solution of known concentration. How much volume of NaOH 0.132 M is necessary to neutralize 10.00 mL of HCl 0.200 M.
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10/03/19

What’s the net ionic equation?
HClO4(aq)+NaOH(aq)——>H2O+ClO4
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10/03/19

What’s the molecular and net ionic equation?
Complete and balance the molecular equation for the reaction of aqueous chromium(II) bromide, CrBr2, and aqueous sodium carbonate, Na2CO3.
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10/03/19

What’s the molecular equation and net ionic equation?
Complete and balance the molecular equation for the reaction of aqueous sodium sulfate, Na2SO4, and aqueous barium nitrate, Ba(NO3)2.
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10/03/19

What’s the net ionic equation?
Write the balanced net ionic equation for the reaction between iron(II) percholate and sodium oxalate. Include phases. Fe(ClO4)2(aq)+ Na2C2O4(aq)——>
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10/03/19

Solution Stoichiometry: Precipitation Calculation
Calculate the number of milliliters of 0.732 M KOH required to precipitate all of the Pb2+ ions in 125 mL of 0.905 M Pb(NO3)2 solution as Pb(OH)2. The equation for the reaction is:Pb(NO3)2(aq)... more
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10/03/19

calorimetry find energy change
A 1.32-g sample of L-ascorbic acid (C6H8O6) is burned in a bomb calorimeter and the temperature increases from 25.20 °C to 28.10 °C. The calorimeter contains 1.18×103 g of water and the bomb has a... more
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10/02/19

An aqueous solution of sucrose (C12H22O11) is prepared by dissolving 7.1800 g in sufficient deionized water to form a 25.00 mL solution. Calculate the molarity of the solution.
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10/02/19

An aqueous solution of iron(II) sulfate (FeSO4) is prepared by dissolving 2.75 g in sufficient deionized water to form a 150.00 mL solution. Calculate the molarity of the solution.
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10/02/19

Chemistry help- effective nuclear charge
In terms of size, between which of the spheres would you find the Ca2+ and S2- ions?note:not all targets will be usedMg2+, K+, Cl-, Se2-
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10/02/19

Simplifying Mole Ratios
I was balancing and finding the mole ratio for octane to carbon dioxide in a combustion reaction of octane and it gave me 2:16, do I simplify it?
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10/01/19

Consider the hypothetical reaction A + 3B → 2C. If 6.5 moles of reactant A is combined, how many moles of C can be formed?
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09/30/19

According to the following reaction, how many grams of potassium hydroxide are required for the complete reaction of 27.9 grams of carbon dioxide?
According to the following reaction, how many grams of potassium hydroxide are required for the complete reaction of 27.9 grams of carbon dioxide?carbon dioxide (g) + potassium... more
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09/30/19

Use the activation energy to calculate the ratio of rate constants.

A common "rule of thumb" for many reactions around room temperature is that the rate will double for each ten degree increase in temperature. Use the activation energy (64, 878.29 J/mol ) to... more
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09/30/19

Chemistry 110 Limiting Reactant
C8H18(g)+O2(g)→CO2(g)+H2O(g)how much octane is left if 0.110 mol of octane is allowed to react with 0.890 mol of oxygen.
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09/30/19

A product of a chemical reaction always has different properties than that of the reactants before a chemical reaction
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09/30/19

Physical Chemistry- Calculating Gibbs Free energy for Adiabatic Process
For adiabatic process in a Carnot Engine, we know that Q=0. However, in terms of calculating Delta G aka (Gibbs Free Energy which is dG=H-TdS). We cannot cancel TdS despite dS being zero so how... more
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09/30/19

Buffer Question : addition of base
Calculate the pH of the solution in part A after 25mL of 0.10 M HBr are added to 125 mL of the buffer solution (Part A : 0.35 M HCN, 0.37 M NaCN, ka = 6.2e-10, pH calculated as 9.23)
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09/30/19

Ascorbic acid (H2C6H6O6) is a diprotic acid. The acid dissocation constants for H2C6H6O6 are Ka1=8.00×10−5 and Ka2=1.60×10−12. Determine the pH of a 0.118 M solution of ascorbic acid.
Determine the equilibrium concentrations of all species in the solution: H2C6H6O6 HC6H6O6^- C6H6O6^2-
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09/30/19

For the diprotic weak acid H2A, Ka1=2.8×10−6 and Ka2=7.7×10−9 . What is the pH of a 0.0450 M solution of H2A ?

What are the equilibrium concentrations of H2A and A^2- in this solution?
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09/30/19

Sulfurous acid (H2SO3 ) is a diprotic acid with Ka1=1.39×10−2 and Ka2=6.73×10−8 . Determine the pH of a 0.180 M sulfurous acid (H2SO3 ) solution.
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09/29/19

Calculate the quantity of energy needed to heat 8.0 g of water from 42.0 °C to 45.0 °C. Report your answers in scientific notation.
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09/29/19

Chemistry Titration
If you are given a 250mL volumetric flask, (+-.01mL) what volume of a 2.00M stock solution will you need to make a 250.00mL of the .15M NaOH titrant solution?
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