In a 1 M solution of NH3(aq), identify the relative molar amounts of these species. Arrange them from most to least.

The molecular mass of methyl ethanoate is 74.1 amu . calculate the molecular mass of propanoic acid, an isomer of methyl ethanoa

kobusy [5.1K]

Isomers are the compounds having same molecular formula but different structural formula.

Since, molecular formula is isomers are same, they have same mass.

Now, methyl ethanoate is an isomer of propanoic acid, hence they have same mass.

∴ Molecular mass of propanoic acid = 74.1 amu or 74.1 g/mol

4 0

2 years ago

How many grams of KClO3 are needed to produce of 4.26 moles of O2? 2 KClO3 2 KCl + 3 O2 a. 348 g b. 136 g c. 174 g d. 522 g e. 7

JulsSmile [24]

Ok so this is what we know :

2KClO3 -> 2KCl + 3O2 (Always check if equation is balanced - in this case it is)
4.26moles
So we know that we have 4.26 moles of oxygen (O2). Now lets look at the ratio between KClO3 and O2.
We see that the ratio is 2:3 meaning that we need 2KClO3 in order to produce 3O2.
Therefore divide 4.26 by 3 and then multiply by 2.
4.26/3 = 1.42
1.42 * 2 = 2.84
Now we know that the molarity of KClO3 is 2.84 moles.
Multiply by R.M.M to find how many grams of KClO3 we have.

R.M.M of KClO3
K- 39
Cl- 35.5
3O- 3 * 16 -> 48
---------------------------
122.5
2.84 * 122.5 = 347.9 grams therefore the answer is (a)
348 grams needed of KClO3 to produce 4.26 moles of O2.
Hope this helps :).

8 0

1 year ago

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A new student is planning to use thin layer chromatography (TLC) for his research project. After setting up the apparatus the st

tamaranim1 [39]

Answer:

The open system evaporates the solvent in the solution

Explanation:

An open system is a system in which exchange of materials and energy can occur. If a TLC set up is left open, then the set up constitutes an open system.

During TLC, the sample is dotted on the plate and inserted into a suitable solvent. The solvent moves up the plate and achieves the required separation of the mixture.

Most of these solvents used used TLC are volatile organic compounds. Therefore, if the TLC set up is left open, the solvent will evaporate leading to poor results after running the TLC experiment.

7 0

1 year ago

Write the symbolic notation of an isotope of an element having 8 protons, 8 electrons, and 11 neutrons. Click on the “Templates”

horrorfan [7]

Attached to this answer is the format of Isotope Notation that you can use for future reference. (Please open)

There are 8 Protons. The Atomic Number is the same number of an element's proton.

If you can see in the format, the mass number is calculated by adding the atomic number/protons and neutrons.

Mass number = 8 + 11
Mass number = 19

The image of the final answer is attached as well.

5 0

1 year ago

PLEASE HELP!!!!!!!!!!!!!

lions [1.4K]

Answer:

Pd(O2C2H3)2

Explanation:

Percentage composition of elements in the compound:

Pd= 47.40%

O=28.50%

C=21.40%

H= 2.69%

Molar mass of each element

Pd= 106g/mol

O= 16g/mol

C= 12g/mol

H= 1g/mol

Step 1

Find the moles of each element in 100g sample using the formula

no. of moles(n)=mass/molar mass

For Pd: 47.40g/106g/mol

n= 0.447 moles

For O: 28.50/16

n= 1.78 moles

For C: 21.40/12

n= 1.783 moles

For H: 2.69/1

n= 2.69moles

Step 2

Now divide the no. of moles separately by the smallest number of moles. Smallest number of moles is 0.447

Pd= 0.447/0.447

= 1

O= 1.78/0.447

= 3.9=4

C= 1.78/0.447

= 3.9=4

H= 2.69/0.447

= 6

Hence empirical formula is PdO4C4H6

The probable molecular formula is $Pd(O_{2}C_{2}H_{3})2$

8 0

1 year ago

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