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3 years ago

5

A chemical equation is balanced when the number of each

1 answer:

Lelu [443]3 years ago

4 0

Answer: Atom/element

Explanation: Since matter cannot be created or destroyed, the number of atoms has to be equal on both sides of the equation.

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What was one main point of daltons atomic theory

bagirrra123 [75]

The main points of Dalton's atomic theory are: Everything is composed of atoms, which are the indivisible building blocks of matter and cannot be destroyed. All atoms of an element are identical. The atoms of different elements vary in size and mass.

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4 years ago

How many carbon atoms are present in 3.900 x 10-4 mol of carbon? Give your answer in scientific notation. x 10 (select) A

AnnyKZ [126]

<u>Answer:</u> The number of atoms of carbon present in given number of moles are $2.350\times 10^{20}$

<u>Explanation:</u>

We are given:

Number of moles of carbon = $3.900\times 10^{-4}mol$

According to mole concept:

1 mole of an element contains $6.022\times 10^{23}$ number of atoms.

So, $3.900\times 10^{-4}mol$ of carbon will contain = $3.900\times 10^{-4}\times 6.022\times 10^{23}=2.350\times 10^{20}$ number of atoms.

Hence, the number of atoms of carbon present in given number of moles are $2.350\times 10^{20}$

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3 years ago

A system that does no work but that transfers heat to the surroundings has

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