25,963 Answered Questions for the topic chemistry

Chemistry

05/20/24

How many moles of H₂O can be formed from 3.85 × 10²³ molecules of NH₃ from the following equation? 4 NH₃(g) + 5 O₂(g) → 4 NO(g) + 6 H₂O(g)
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Chemistry

05/20/24

This question concerns stoichiometry.

Salicylic acid, C7H6O3, is reacted with acetic anhydride, C4H6O3, to produce aspirin, C9H8O4, and acetic acid in this reaction:C7H6O3(s) + C4H6O3(l) yields C9H8O4(s) + CH3COOH(l). If 125.0 mol... more
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Chemistry

05/18/24

Calculate the molarity of a solution that contains 10.0g of sucrose (C12H22O11) dissolved into a 125mL solution.
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Chemistry

05/16/24

This question concerns quantifying solution concentration and molarity.

Determine the mass of solute required to make each of the following solutions:a. an 8.00 M solution of NaOH, with water added to bring the solution volume to 2.25 Lb. a 15.0 M solution of acetic... more
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Chemistry

05/16/24

My question concerns freezing point depression and boiling point elevation.

Determine the molar concentration of a glycerol and water solution for boiling points of 101.75 degrees C, 100.99 degrees C, and 103.17 degrees C.  
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Chemistry

05/16/24

This question concerns freezing point depression and boiling point elevation.

Determine the molality of ethylene glycol in water required to prevent the solution from freezing at -18 degrees C. 
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Chemistry

05/16/24

This question concerns freezing point depression and boiling point elevation.

The specific gravity of a substance is defined as the ratio of the substance's density to the density of water. For example, a substance with a specific gravity of 0.750 is 75.0% as dense as water,... more
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Chemistry

05/16/24

The pH is given for three solutions. Calculate [H+] and [OH -] in each solution.
a) pH = 2.45[H+] M[OH-] M(b) pH = 12.42[H+] M[OH-] M(c) pH = 6.29[H+] M[OH-] M
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Chemistry

05/16/24

Calculate the pH and pOH of aqueous solutions having the following ion concentrations.
a) [OH-] = 3.0 ✕ 10-6 M pOH =  pH =  (b) [OH-] = 6.1 ✕ 10-4 M pOH =  pH =  (c) [H+] = 3.8 ✕ 10-9 M pOH =  pH =  (d) [H+] = 0.027 M pOH =  pH = 
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Chemistry

05/16/24

Calculate the pH of solutions having the following ion concentrations at 298 K.
a) [H+] = 2.0 ✕ 10-2 M(b) [H+] = 2.0 ✕ 10-6 M(c) [OH-] = 7.3 ✕ 10-6 M
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Chemistry

05/16/24

If given 0.811 mol of oxygen in CO2, how many mol of C will there be?
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Chemistry Math

05/14/24

Freezing point depression, activity
ln aS,2 = ln mi + ∑ (55,51/m)*d(− ln aH2O) = ln mi + I (1)How do I calculate aB,2 from that given formula?
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Chemistry Math

05/14/24

Freeze depression point, sugar in water, how do I calculate the activity?
I will give some background on the concept for context and then state my question at the end:Consider a solution containing nA and nB moles of solvent A and solute B, respectively. According to the... more
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05/13/24

Thermodynamics problem
We solved this task in the class, but I don't understand it. I would be very happy if someone could explain it in general terms. I can write the basic equations for the adiabatic change of state,... more
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Chemistry

05/13/24

My question concerns percent composition.

Determine the percent composition of nitroglycerine, C3H5N3O9
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Chemistry

05/13/24

Can a tutor teach a child in Singapore?
We live in Singapore . But your form does not allow us to put a zip code outside USA. We are US citizens. But my child goes to an American school in Singapore. please let me know how can request a... more
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Chemistry

05/12/24

What design features should an airbag manufacturer put in place to make a baking soda and vinegar airbag? What are your general recommendations for how they should design this airbag?
What design features would you recommend an airbag manufacturer put in place to make a baking soda and vinegarairbag? What are considerations for this design? Write 2-3 paragraphs. Be sure to... more
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Chemistry

05/12/24

My question concerns the stoichiometry of gases.
Solid aluminum reacts with an aqueous solution of HCl to produce an aqueous solution of AlCl3 and hydrogen gas. If 110.0 g HCl are in the solution and 25.00 g Al are added, determine the... more
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Chemistry

05/11/24

Kinetics in gas phases
The kinetics of a gas phase reaction of the form A → Products results in a rate constant of 1.308 M⁻¹ s⁻¹. For this reaction, the initial concentration of A is 0.947 M. At what time would the... more
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Chemistry

05/11/24

My question concerns the heat of capacity, heat of fusion, and heat of vaporization.

How much heat is required to melt 22.0 kg of ice at 0 degrees Celsius and then warm the water to 20.0 C?
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Chemistry

05/11/24

My question concerns the stoichiometry of gases.

Solid aluminum reacts with an aqueous solution of HCl to produce an aqueous solution of AlCl3 and hydrogen gas. If 110.0 g HCl are in the solution and 25.00 g Al are added, determine the... more
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Chemistry

05/11/24

This question concerns the stoichiometry of gases.

Methanol, CH3OH, is also known as wood alcohol. It is manufactured by reacting carbon monoxide and hydrogen gases at high temperatures and extreme pressure. Assume 666.0 m3 CO and 1210.0 m3 H2 go... more
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Chemistry

05/11/24

My question concerns the stoichiometry of gases.

Nitroglycerine, C3H5N3O9, is an oily liquid at room temperature that explodes just by being jostled too much. When it explodes, the following reaction occurs: 4C3H5N3O9(l) yields 10H2O(g) +... more
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Chemistry

05/11/24

My question concerns the electromagnetic spectrum.
Determine the wavelength of a photon with an energy of 3.20 x 10 to the -18th power J, and state what part of the electromagnetic spectrum it is in. 
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Chemistry

05/10/24

What is the pH of a 0.0380 M solution of HONH₃Cl (Kb of HONH₂ is 1.1 × 10⁻⁸)?
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