How might you separate a mixture of sand and salt?

1 answer:

3 0

You can separate a mixture of salt and sand by...

First combing the mixture with water and mix thoroughly until the salt dissolves..

Then you could let the sand settle at the bottom of the salt water, so you can strain salt water to separate the sand from salt water...

To get salt... you would heat up the water to let it evaporate. When all the water is evaporated, the salt will be left behind

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How many moles of oxygen atoms are in 7.9E-1 moles of CO_2

Ilya [14]

Answer:

The number of moles of O atom in $(7.9\times10^{-1})$ mol of $CO_{2}$ = 1.6

Explanation:

1 molecule of $CO_{2}$ contains 2 atoms of O

So, $(6.023\times 10^{23})$ molecules of $CO_{2}$ contains $(2\times6.023\times10^{23})$ atoms of O.

We know that 1 mol of an atom/molecule/ion represents $6.023\times10^{23}$ numbers of atoms/molecules/ions respectively.

So, $(6.023\times 10^{23})$ molecules of $CO_{2}$ is equal to 1 mol of $CO_{2}$ .

$(2\times6.023\times10^{23})$ atoms of O is equal to 2 moles of O atom.

Hence, 1 mol of $CO_{2}$ contains 2 moles of O atom.

Therefore, $(7.9\times10^{-1})$ mol of $CO_{2}$ contains $(2\times7.9\times10^{-1})$ moles of O atom or 1.6 moles of O atom.

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3 years ago

Why did you get that wrong?

victus00 [196]

Answer:

Got what wrong? A question?

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What is the difference between a homogeneous and heterogeneous mixture?

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A heterogeneous mixture is a mixture that is mixed well. ( you can’t see the different parts)
Ex: Rain or air

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