301 Answered Questions for the topic chem

20d

Use primary standard to determine unknown concentration

Potassium hydrogen phthalate is a solid, monoprotic acid frequently used in the laboratory as a primary standard. It has the unwieldy formula of KHC8H4O4. This is often written in shorthand... more

When 3.87 g of a nonelectrolyte solute is dissolved in water to make 235 mL of solution at 28 °C, the solution exerts an osmotic pressure of 857 torr.

What is the molar concentration of the solution?How many moles of solute are in the solution?What is the molar mass of the solute?
Chem Chemistry

03/16/21

pH values of solution x

Please help me with this quesions! I feel I have an overall understanding of everything but I am having trouble applying it to these...A student prepares a solution (Solution X) by dissolving 0.045... more

03/13/21

SOS! Please help with rate law problem!

Step 1 : A + B → C + E (slow) Step 2 : B + E → D (fast)Predict the rate law if step 1 is slow.

03/03/21

Chemistry Homework Help! Combustion!

How many moles of water is produced by the complete combustion of 5 g of propane Convert this answer into grams Show that the conservation of mass was a balanced during the complete combustion of... more

03/03/21

Chemistry Homework! Combustion!

How many moles of carbon dioxide is produced by the complete combustion of 5 g of propane Convert this answer into grams

03/03/21

Chemistry Homework! Combustion!

During combustion how many moles of oxygen are needed to react with 5 g of propane? Convert this answer into grams

What kinetic energy, 𝐸k , must the electrons have in order to resolve a protein molecule

To resolve an object in an electron microscope, the wavelength of the electrons must be close to the diameter of the object. What kinetic energy ,𝐸k, must the electrons have in order to resolve a... more

Maximum mass of an object

Assuming that the smallest measurable wavelength in an experiment is 0.430 fm, what is the maximum mass of an object traveling at 913 m⋅s−1 for which the de Broglie wavelength is observable?

03/02/21

What is the molecularity of each of the elementary steps?

step 1:      Mo(CO)6 → Mo(CO)5 + CO    step 2:     Mo(CO)5 + L → Mo(CO)5La. Step 1 is unimolecular and step 2 is bimolecular.b. Step 1 is unimolecular and step 2 is unimolecular.c. Step 1 is... more

In a lab, nitrogen trichloride is synthesized from its elements. This reaction has a 60.0% yield...

In a lab, nitrogen trichloride is synthesized from its elements. This reaction has a 60.0% yield. A chemist wants to prepare 50.0g of nitrogen trichloride, with a 60.0% yield, what mass of nitrogen... more

Concentration of sulfuric acid after neutralization

Write the balanced neutralization reaction that occurs between H2SO4 and in KOH aqueous solution. Phases are optional.Suppose 0.250 L of 0.500 M of H2SO4 is mixed with 0.200 L of 0.240 M KOH. What... more

Concentration of sulfuric acid and balanced equation

Write the balanced neutralization reaction that occurs between H2SO4 and in KOH aqueous solution. Phases are optional.Suppose 0.250 L of  0.500 M of H2SO4 is mixed with 0.200 L of  0.240 M KOH.... more

Net ionic equation

Write the net ionic equation for the chemical reaction shown. Include physical states.HClO2(aq)+NaOH(aq)⟶H2O(l)+NaClO2(aq)
Chem Chemistry

02/22/21

PLzz helppp i only kno how to balance them

Balance the following, identify the solid, liquid, or gas produced and find the net ionic equation for the following. 1. CuCl2 + K3PO4 --> KCl + Cu3PO42. H2SO4 + NaOH --> Na2SO4 + H2O3.... more

02/22/21

Which of the solutions (A, B, or C) will have the highest freezing point?

Consider the following four solutions:(A) 0.175 moles of KClKClin 1.250 kg of water (B) 0.175 moles of C6H12O6C6​H12​O6​(glucose) in 0.750 kg of water (C) 0.075 moles of Ca(NO3)2Ca(NO3​)2​in 0.950... more
Chem Chemistry

02/22/21

Charles laww helpp plzz

1) A sample of gas occupies 6.74 L at 325oC, what will its volume be at 25.0oC if the pressure does not change?2) A balloon is inflated at room temperature of 22.0oC and has a volume of 3.86 L. ... more

College Chemistry Question

10. Write how many electrons each of the following can accept at the most:subshell 2s: ___ shell 1: ___ one 4f orbital: ___ subshell 5p: ___11. For an atom of 13Al, write its full electron... more

Propose structures for A, B and C that are consistent with these data.

Unknown A has a molecular formula of C10H20. Reaction of A with H2 over Pt/C gives compound B with a formula of C10H22. Reaction of A with CH2I2, Zn(Cu) gives a compound C (C11H22) that contains a... more

02/19/21

What is the concentration of Cu^{2+} in the resulting solution?

23.6 mL of 0.141 M copper(II) sulfate reacts with 15.9 mL of 0.114 M sodium hydroxide to form a precipitate (Cu(OH)). What is the concentration of Cu in the resulting solution?Thank you!
Chem Chemistry

02/19/21

Calculate the vapor pressure of the resulting ethylene glycol solution.

107.1 g of non-volatile ethylene glycol (62.07 g mol ) is added to 336 g of water at room temperature. The vapor pressure of water at room temperature is 23.76 Torr. Calculate the vapor pressure of... more

02/16/21

For a certain reaction, K⁰ = 1.2 × 104 at 25 °C, and K⁰ = 4.3 × 103 at 125 °C

12. For a certain reaction, K⁰ = 1.2 × 104 at 25 °C, and K⁰ = 4.3 × 103 at 125 °C. (a) Is this reaction endothermic, or is it exothermic? (b) Calculate ΔHr⁰.14. For the reaction in exercise 12,... more

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