12/19/20

Please Help Chemistry

1-If a sample of a gas at 32 oC has a pressure of 1.92 atm, what will its pressure be at 78 oC?2-The % concentration by mass of a solution prepared by dissolving 26.4 g of NaBr in 415 g of solution... more
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12/18/20

F2, Br2, and I2 are...

F2, Br2, and I2……  a are molecules, but not compounds  b are compounds, but not molecules  c are molecules and compounds
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12/17/20

Answer the following questions relating to pH and concentration
Determine the following: The pH of 8.3 x 10-2M barium hydroxide The [H3O+] of 9.8 x 10-9M hydrocyanic acid The pOH of 1.7 x 10-3M calcium hypochlorite Will a solution of 0.1M ammonium benzoate... more
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12/17/20

Using the table below, determine if the ocean is a buffer.
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12/17/20

Chemistry Dynamic Equilibrium - HELP
I don't understand this chart, but based on the question itself I assume either increasing or decreasing the temperature, decreasing the pressure, and increasing or decreasing the concentration of... more
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12/17/20

How many molecules are in 64.2 grams of barium nitrate?
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12/17/20

How many grams of oxygen are in 5.21 grams of Al2(SO4)3?
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12/17/20

A sample of water at 75.6 C is cooled to 22.8 C. It released 19500 J of energy. What was the mass of water?

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12/17/20

955 grams of water at 25.0 C is heated to 85.5 C. Calculate the amount for Q in Joules?
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12/17/20

The amount of heat gained by the system is 425 J. The amount of work done by the system on the surroundings is 352 J. The change in Internal energy (🔺U) is ___________
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12/16/20

Dissociation or electrolytes

Equation for dissociation
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12/16/20

How many grams of iron are in a 54.39g sample of iron(III) oxide?
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12/16/20

I got stuck on this Chemistry problem, please help
The reaction below took place at a temperature of 500 K.  N2 (g) + 3H2 (g) ↔ 2NH3 (g) ΔH = -92.4 kJ K = 1.45 x 10-5(a) Identify one way that a chemist could increase the production of the... more
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12/16/20

I need help understanding how to do this, could anyone help?
Consider the reaction shown below to answer the following questions.A (g) ↔ 2B (g) ΔH = + K > 1  Explain how the reaction would respond if each of the following changes were made after... more
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12/16/20

I've been having trouble understanding this
In the reaction below, initially 5.0 atm of A and an unknown pressure of B are present in a flask at a temperature of 298 K.2A (g) + B (g) ↔ 2C (g) ΔG = -12.5 kJ/mol(a) Write the expression for the... more
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12/16/20

What would the rate of the reaction be (in mol L−1 s−1) when concentration of A = 0.43 mol L−1, B = 0.185 mol L−1, and C = 0.207 mol L−1?
An experiment was designed to the study the reaction kinetics of a reaction that contains the reactants A, B, and C. Given the following data:A0 (mol L−1) B0 (mol L−1). C0 (mol L−1). Initial... more
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12/16/20

Barium fluoride, BaF2, has a measured solubility of 0.02 mol/L at 25°C. What is the solubility product constant?
Barium fluoride, BaF2, has a measured solubility of 0.02 mol/L at 25°C. What is the solubility product constant?
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12/16/20

The enthalpy change ΔHo for 2 C (s) + 3 H2 (g) → C2H6 (g) is
 Consider the following reactions:                C2H6 (g) + 7/2 O2 (g) → 2 CO2 (g) + 3 H2O (l)      ΔHo = − 1541 kJ                H2 (g) + ½ O2 (g) → H2O (l)                      ΔHo = − 286... more
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12/15/20

Limiting Reactants: Compare Product Method (Mass/Mass)
For the following reaction, 21.5 grams of iron are allowed to react with 33.7 grams of chlorine gas.iron (s) + chlorine (g)  iron(III) chloride (s)What is the maximum amount of iron(III)... more
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12/15/20

An experiment was designed to the study the reaction kinetics of a reaction that contains the reactants A, B, and C. Given the following data:
An experiment was designed to the study the reaction kinetics of a reaction that contains the reactants A, B, and C. Given the following data:This is supposed to be a table:A0 (mol L−1) B0... more
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12/15/20

Explain how you would use Avogadro’s law given the grams of known compound and volume.

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12/15/20

Difference between alcohols
Hi!I have done a lab where I test the solubility of a few alcohols with water, and what happens when I ignite them. The alcohols I have used are, and the results I got are: Methanol: Easy to... more
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12/15/20

Igniting Alcohol
Hi!I have a question:When I ignite a specific alcohol, let's say propanol, it does not catch on fire. But when I dip a piece of paper in propanol and ignite it, then I will see a flame. Why does it... more
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12/15/20

Thermochemistry
C3H8 + 5O2 ---> 3CO2 + 4H20Delta H = -2043.9 KJ/MolIf 25.0g of C3H3 reacts with 25.0g of O2, how much energy will be released?
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12/15/20

Role of electrolytes in a galvanic cell
Suppose we had an electrochemical cell consisting of two half cells each with their own electrodes and electrolytes.Example:Zn (s) + 2NO3 (aq) ➡️ Zn(NO3)2 (aq) + 2eAgNO3 (aq) + e ➡️ Ag(s) +... more
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