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3 years ago

What is the mass percentage of cobalt in cobalt(ii) fluoride, cof2?

1 answer:

7 0

I’m not sure about the whole compound but I know that Cobalt mass Percentage is 60.800%
And Fluorine is 39.200%.
I hope that helps a little!

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How are electrons arranged in ionic bonds?

shutvik [7]

Ionic bonding is a type of chemical bond in which valence electrons are lost from one atom and gained by another. This exchange results in a more stable, noble gas electronic configuration for both atoms involved. An ionic bond is based on attractive electrostatic forces between two ions of opposite charge.

5 0

3 years ago

21) What is the volume (inL) of 3470 g of liquid glycerol, which has a density of 1.26 g/?

Illusion [34]

Answer:

V = 2.75 L

Explanation:

Given that,

Mass of liquid glycerol, m = 3470 g

The density of liquid glycerol, d = 1.26 g/cm³

We need to find the volume of liquid glycerol.

We know that,

Density=mass/volume

$V=\dfrac{m}{d}\\\\V=\dfrac{3470\ g}{1.26\ g/cm^3}\\\\V=2753.96\ cm^3$

We know that, 1 cm³ = 0.001 L

V = 2.75 L

So, the volume of liquid glycerol is 2.75 L.

6 0

3 years ago

How many molecules of CH4 are in 48.2 g of this compound? A) 2.00 x 1023 B) 5.00 x 10-24 C)1.81 x 1024 D) 4.00 E) 4.64 x 1026 10

Tasya [4]

<u>Answer:</u> The correct answer is Option C.

<u>Explanation:</u>

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Given mass of methane = 48.2 g

Molar mass of methane = 16 g/mol

Putting values in above equation, we get:

$\text{Moles of }CH_4=\frac{48.2g}{16g/mol}=3.0125mol$

According to mole concept:

1 mole of compound contains $6.022\times 10^{23}$ number of molecules.

So, 3.0125 moles of methane will contain = $3.0125\times 6.022\times 10^{23}18.141\times 10^{23}=1.81\times 10^{24}$ number of molecules.

Hence, the correct answer is Option C.

8 0

3 years ago

An isotope, x, of a particular element has an atomic number of 16 and a mass number of 34. therefore: select one:

never [62]

Number protons is what determines the element.
16 protons determines that the substance is sulphur.

The number of neutrons can vary according to the isotope. The mass number is the total count of neutrons and protons, so sulphur with a mass number of 34 has 34-16=18 neutrons.

32.065 is the weighted average of the atomic weights of different isotopes, so does not apply to a single isotope.

8 0

3 years ago

Krypton is named after the Greek word that means “secret.” Which explains why krypton was most likely given this name?

GaryK [48]

Answer:

C) Krypton is a noble gas, so it was difficult for chemists to find it, as though it was a secret.

Explanation:

4 0

3 years ago

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