All categories

3 years ago

5 kinds of trace fossils

Chemistry

1 answer:

ivolga24 [154]3 years ago

4 0

↑Domichinica
↓Fodinichnia
↑Pascichnia
↓Cubichnia
↑Repichnia

You might be interested in

He heat of solution of kcl is 17. 2 kj/mol and the lattice energy of kcl(s) is 701. 2 kj/mol. calculate the total heat of hydrat

Alexandra [31]

The total heat of hydration of 1. 00 mol of gas phase $K^{+}$ ions and $Cl^{-}$ ions is - 684 kJ/mol.

Calculation ,

Given data ,

Heat of solution = 17. 2 kJ/mol

lattice energy of KCl(s) = 701. 2 kJ/mol.

heat of hydration = ?

The KCl is formed by $K^{+}$ ions and $Cl^{-}$ – ions

Δ $H_{solution}$ = U° + Δ $H_{hydration}$

Δ $H_{hydration}$ = Δ $H_{solution}$ - U° = 17. 2 kJ/mol - 701. 2 kJ/mol = - 684 kJ/mol

Hence, heat of hydration of 1. 00 mol of gas phase $K^{+}$ ions and $Cl^{-}$ ions is - 684 kJ/mol.

To learn more about hydration

brainly.com/question/15724859

#SPJ4

7 0

2 years ago

My labmate discovered a new compound and wanted to try to determine what it could be. We noticed that when mixed with an acid, i

kvv77 [185]

Answer:

it went under the process known as crystalization

Explanation:

am a chemist

4 0

3 years ago

A 544 mg of a mixture of fluorene and benzoic acid was weighed out and subjected to an extraction and recrystallization. After t

butalik [34]

Answer: The percent composition of fluorene is 33.08 % and benzoic acid is 36.03 %.

Explanation:

We are given:

Mass of mixture = 544 mg

Mass of fluorene after purification = $1.80\times 10^2mg=180mg$

Mass of benzoic acid after purification = 196 mg

To calculate the percentage composition of a substance in a mixture, we use the equation:

$\%\text{ composition of substance}=\frac{\text{Mass of substance}}{\text{Mass of mixture}}\times 100$

For fluorene:

$\%\text{ composition of fluorene}=\frac{180}{544}\times 100=33.08\%$

Hence, the percent composition of fluorene is 33.08 %

For benzoic acid:

$\%\text{ composition of benzoic acid}=\frac{196}{544}\times 100=36.03\%$

Hence, the percent composition of benzoic acid is 36.03 %

5 0

4 years ago

What is the concentration of kl solution if 20.68g of solute was added to enough water to form 100ml solution?

rewona [7]

Answer:

1.25 M

Explanation:

Step 1: Given data

Mass of KI (solute): 20.68 g

Volume of the solution: 100 mL (0.100 L)

Step 2: Calculate the moles of solute

The molar mass of KI is 166.00 g/mol.

20.68 g × 1 mol/166.00 g = 0.1246 mol

Step 3: Calculate the molar concentration of KI

Molarity is equal to the moles of solute divided by the liters of solution.

M = 0.1246 mol/0.100 L= 1.25 M

5 0

3 years ago

Water is an example of a (n)(ionic/molecular) compound

Tanzania [10]

I think ionic ?
i dont know so dont take my anwser yet

5 0

4 years ago