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3 years ago

Examples 1) How many atoms of silver are there in 4.5 moles of silver? [Ag = 107.8682 g/mol]

Chemistry

2 answers:

Anon25 [30]3 years ago

7 0

3.0x10-4..............................

densk [106]3 years ago

7 0

Answer:

2.7 x 10^24 atoms of silver

Explanation:

4.5 mol of Ag x 6.02 * 10^23 atoms of Ag / 1 mol of Ag

= 27.09 x 10^23 atoms of Ag

*note: round to nearest 2 sigfig

= 2.7 x 10^24 atoms of Ag

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In a heat engine, 500 J of heat enters the system, and the piston does 300 J of work. What is the final internal (thermal) energ

mylen [45]

Answer:

200J

Explanation:

This is because 500J - 300J = 200J

I hope this helps!!!

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3 years ago

A solid has shape and volume?

tia_tia [17]

Answer:

A solid has a definite volume and shape, a liquid has a definite volume but no definite shape, and there is no definite volume or shape of a gas. Usually, the transition from solid to liquid does not change a substance's volume substantially.

Explanation:

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2 years ago

Determine the empirical formula of a compound containing 40.6 grams of carbon, 5.1 grams of hydrogen, and 54.2 grams of oxygen.

Lilit [14]

The Empirical formula of compound is C₁H₂O₁. The Molecular Formula of the compound is 4 (C₁H₂O₁).

<h3>What is Empirical Formula ?</h3>

Empirical formula is the simplest whole number ratio of atoms present in given compound.

Element % Atomic mass Relative no. of atoms Simplest whole ratio

C 40.6 12 $\frac{40.6}{12}$ = 3.3 $\frac{3.3}{3.3} = 1$

H 5.1 1 $\frac{5.1}{1}$ = 5.1 $\frac{5.1}{3.1} = 2$

O 54.2 16 $\frac{54.2}{16}$ = 3.3 $\frac{3.3}{3.3} = 1$

The Empirical formula of compound is C₁H₂O₁ or CH₂O

<h3>How to find the Molecular formula of compound ?</h3>

Molecular formula = Empirical formula × n

$n = \frac{\text{Molecular weight}}{\text{Empirical Formula weight}}$

$= \frac{118.084}{30}$

= 4

Molecular formula = n × Empirical formula

= 4 (C₁H₂O₁)

Thus from the above conclusion we can say that The Empirical formula of compound is C₁H₂O₁. The Molecular Formula of the compound is 4 (C₁H₂O₁).

Learn more about the Empirical Formula here: brainly.com/question/1603500

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2 years ago

How many valence electrons are there in sulfur, and iodine.

Vinil7 [7]

Today I will explain what a valence electron is and how many valence electrons each of the atoms your asking about have. :)

→ A valence electron is an electron in the outer shell of an atom that is able to participate in bonding. While iodine has 53 electrons, all but seven are in the inner shells of the iodine atom.

→ Sulfur has sixteen electrons in total, two in the inner shell, eight in the middle, and six in the outer. This means that sulfur has six valence electrons.

↑ ↑ ↑ Hope this helps! :D

7 0

3 years ago

At the county fair, Carrie and Sam climbed up on the carousel horses. Around and around they went; the horses also bobbed up and

grigory [225]

I believe sam's response is correct.
When human is riding a moving target with constant speed over a period of time, we tend to have a visual acceleration perception due to our optical movement.
This make people such as Carrie believes that the carousel horses are accelerating while it actually stayed at constant pace.

3 0

3 years ago