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3 years ago

How many moles in Co are there in 6 billion Co atoms

1 answer:

3 0

Hello there!

 Use Avogadro's number, 1 mol = 6.02 x 10^23 atoms.
Convert atoms to moles and you get:

9.97x10^(-15) moles Co

Hope This Helps You!
Good Luck :)

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Sam records the mass of his evaporating dish as 6.488 g. He records the mass of the evaporating dish and the sample of hydrate a

jok3333 [9.3K]

Answer:

$0.46$ moles of water were removed from the sample by the heating process

Explanation:

Given

Mass of the evaporating dish $= 6.488$ grams

Mass of the sample of hydrate $= 19.72$ grams

Mass of the sample and dish after heating $= 11.344$ grams

The weight of water removed through evaporation

$= 19.72 - 11.344 = 8.376$ grams

Weight of one mole of water $= 18$ grams

Number of moles of water in $8.376$ Grams of water is equal to

$\frac{8.376}{18} = 0.46$ moles

5 0

3 years ago

Which of the following statements about energy is true? I. Kinetic energy cannot be transformed into another type of energy. II.

Aleks [24]

Answer:

Explanation:

First Law of thermodynamics says energy of the universe is constant and can only be changed in other forms of energy

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4 years ago

Salt dissolved in water is a solution, therefore _____.

saveliy_v [14]

Answer: Correct options are as follows.

salt is not chemically bonded to water.

salt and water retain their own chemical properties.

Explanation:

When salt is dissolved in water then it means that it is a physical change as salt has completely dissociated into ions but they are not chemically combined to the water molecules.

As a result, both salt and water will retain their chemical properties.

For example, NaCl when dissolved in water will dissociate as follows.

$NaCl \rightarrow Na^{+} + Cl^{-}$

Only the particles of salt have evenly distributed in water.

And, when a components of a salt chemically combine with another substance then it will form a new compound.

Therefore, we can conclude that salt dissolved in water is a solution, therefore:

salt is not chemically bonded to water.

salt and water retain their own chemical properties.

4 0

3 years ago

What the molar mass of carbon2hydrogen6

Alborosie

I’m pretty sure it’s 30.06904

5 0

3 years ago

The symbol for the hydroxide ion is _____. H + H 3O - H(OH) OH -

erastova [34]

Your answer is D, OH-.

8 0

4 years ago

Read 2 more answers