## Search found 149 matches

Fri Apr 02, 2021 9:16 am
Forum: Chemistry forum
Topic: How to find atomic weight of unknown element?
Replies: 2
Views: 130

### How to find atomic weight of unknown element?

A 431 milligram sample of an element reacted with 32 milligram of O2 to form a compound with the formula M2O. Compute the atomic weight of element.
Fri Apr 02, 2021 4:05 am
Forum: Chemistry forum
Topic: Classification of matter
Replies: 1
Views: 92

### Classification of matter

When heated a material produces oxygen gas and residue. Is the substance a mixture of elements, a mixture of compounds, a compound or an element?

My answer to this question:- A material that produces oxygen gas and residue is a compound.
Tue Mar 30, 2021 10:59 pm
Forum: Chemistry forum
Topic: Molecular structure
Replies: 0
Views: 108

### Molecular structure

What is the answer to the following question? The potential energy of two charged particles at a certain distance can be found through the equation E= \frac{q_1q_2}{4\pi\epsilon_0 r} where 1)r is a distance 2) q_1 and q_2 are the charges 3) \epsilon_0= 8.8541878e-12F/m Using the above equation, I co...
Tue Mar 30, 2021 9:29 pm
Forum: Chemistry forum
Topic: Computatiion of Equilibrium Constant
Replies: 3
Views: 136

### Re: Computatiion of Equilibrium Constant

$$K_c= \frac{[NOCl]^2}{[Cl_2][NO]^2}=\frac{[0.060]^2}{[0.165][0.184]^2}=0.644$$
Tue Mar 30, 2021 7:40 pm
Forum: Chemistry forum
Topic: Acid Catalyzed Esterification
Replies: 5
Views: 193

### Re: Acid Catalyzed Esterification

I used online chemical equations balancing calculator and input therin the reacant side of this chemical reaction with some products with appropriate stoichiometric coefficients as well. So, as a result, I secured the above balanced equation. So, i posted it here as an answer. Sorry for posting wron...
Tue Mar 30, 2021 10:25 am
Forum: Chemistry forum
Topic: Computatiion of Equilibrium Constant
Replies: 3
Views: 136

### Computatiion of Equilibrium Constant

Consider the following equilibrium system: 2NO(g) + Cl_2(g) ֖\rightleftharpoons 2NOCl(g) . At a certain temperature, the equilibrium concentrations are as follows: [NO]=0.184 M, [Cl2]=0.165 M, [NOCl]=0.060 M. What is the equilibrium constant for this reaction? My attempt:I am working on this questio...
Tue Mar 30, 2021 10:14 am
Forum: Chemistry forum
Topic: Acid Catalyzed Esterification
Replies: 5
Views: 193

### Re: Acid Catalyzed Esterification

Adding Acetic anhydride(C4H6O3) to Vanillin(C8H8O3) with Sulfuric acid(H2SO4).

If I am correct, the balanced equation is 8C4H6O3(aq) +5C8H8O3(aq) + 39H2SO4(aq) → 11C3H8(g)(Propane) + 39H2CO3(aq)(Carbonic Acid) + 39O2(g)(dioxygen) +39S(s)(Sulfur)
Fri Mar 26, 2021 5:21 am
Forum: Chemistry forum
Topic: Ortho-fluoro aniline and pH reactions
Replies: 14
Views: 385

### Re: Ortho-fluoro aniline and pH reactions

How to use pH solver available on webqc.org to answer this question?
Fri Mar 26, 2021 4:30 am
Forum: Chemistry forum
Topic: mixture
Replies: 4
Views: 173

### Re: mixture

The densities of H2, CO, and CH4 are 0.0899 g/l(STP) , 1.145 g/l(25℃, 1atm) and 0.657 g/l(25℃, 1 atm) respectively.
Thu Mar 25, 2021 11:05 pm
Forum: Chemistry forum
Topic: mixture
Replies: 4
Views: 173

### Re: mixture

Air contains 21% oxygen and 78% od nitrogen and 1% other gases.

How can you use this information to answer this question? What is your answer to this question?
Thu Mar 25, 2021 8:46 am
Forum: Chemistry forum
Topic: acetic acid solution
Replies: 10
Views: 302

### Re: acetic acid solution

Thu Mar 25, 2021 6:08 am
Forum: Chemistry forum
Topic: acetic acid solution
Replies: 10
Views: 302

### Re: acetic acid solution

Here is my computational chemistry work We have 950 ml of solution of CH3COOH. The density of this solution is 1.05g/ml. CH3COOH is present 48% by mass in this solution. Mass of 950 ml of solution is 950 ml *1.05g= 997.50 g. CH3COOH is 0.48 of 997.50 g. = 478.80 g. Molar mass of CH3COOH is 60.0524g/...
Thu Mar 25, 2021 5:12 am
Forum: Chemistry forum
Topic: acetic acid solution
Replies: 10
Views: 302

### Re: acetic acid solution

I edited my answer from 152.5 ml to 145.12 ml. Is this correct?
Thu Mar 25, 2021 3:25 am
Forum: Chemistry forum
Topic: acetic acid solution
Replies: 10
Views: 302

### Re: acetic acid solution

If i am correct , 145.12 ml that need to be transferred from the solution of 950 ml of CH3COOH at 48% by mass with a density of 1.05 g/ml to prepare solution of 1.28 M in 250 ml.
Thu Mar 25, 2021 3:10 am
Forum: Chemistry forum
Topic: stoichiometry
Replies: 4
Views: 202

### Re: stoichiometry

I think the reaction is 2C2H2 + 5O2 → 4CO2 + 2H2O Now, mole ratio of acetylene and carbon dioxide is 1:2. Molar mass of CO2 is 44.0098 g/gmol. Molar mass of C2H2 is 26.0378 g/gmol. 38.9/26.04 = 1.494 mol of C2H2 produces 1.494*2 =mol of CO2. So, CO2 produced is 1.494 * 2*44.0098 = 131.50g. I think, ...