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2 years ago

What has more atoms, a mole of carbon or a mole of fluorine?

Chemistry

1 answer:

GuDViN [60]2 years ago

6 0

Answer:

They have the same number of atoms

Explanation:

The mole (symbol: mol) is the base unit of amount of substance.

Think of mole meaning like inch. An inch of grass is the same as an inch of a flower. Mole is the standard measuring unit of atoms.

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What is the molecular weight, density, and how many moles in

OverLord2011 [107]

Answer:

1) Molecular weight: 18g/mol

Density: at room temperature (25ºC) is 0.997g/mL

Moles: 0.55moles

2) Molecular weight: 182g/mol

Density: at room temperature (25ºC) is 1.11g/mL

Moles: $2.2x10^{-4}moles$

Explanation:

1) The molecular formula of water is $H_{2}O$ thus, the molecular weight is the sum of the weights of its atoms.

H: 1g/mol x 2 = 2g/mol

O: 16g/mol x 1 = 16g/mol

$H_{2}O$ : 2g/mol + 16g/mol = 18g/mol

The density (δ) of water at room temperature (25ºC) is 0.997g/mL

Therefore, the weight (m) of 1mL of water is:

m = δ.V = $0.997\frac{g}{mL}. 1mL = 0.997g$

Multiplying the mass by its molecular weight gives the number of moles:

$\frac{0.997g }{18g/mol} = 0.55 moles$

2) The molecular formula of benzophenone is $C_{13}H_{10}O$ thus, the molecular weight is the sum of the weights of its atoms.

C: 12g/mol x 13 = 156g/mol

H: 1g/mol x 10 = 10g/mol

O: 16g/mol x 1 = 16g/mol

$C_{13}H_{10}O$ : 156g/mol + 10g/mol + 16g/mol = 182g/mol

The density (δ) of water at room temperature (25ºC) is 1.11g/mL

Multiplying the mass by its molecular weight gives the number of moles:

$\frac{0.04g }{182g/mol} = 2.2x10^{-4}moles$

3 0

4 years ago

Read 2 more answers

A solution containing equal numbers of hydrogen ions and hydroxide ions is

igor_vitrenko [27]

Answer:

The answer to your question is: Neutral

Explanation:

A neutral solution is a solution whose pH is 7.

That means that this solution has the same amount of H⁺ and OH⁻.

Examples of neutral solutions:

- distilled water

- sugar solution

- table salt

- cooking oil.

4 0

4 years ago

A solution has pH of 9 what is it?

Vaselesa [24]

Basic. solutions with a pH from over 7 to 14 are bases

5 0

3 years ago

Read 2 more answers

5. A shiny, gold-colored bar of metal weighing 57.3 g has a volume of 4.7 cm 3 . Is the bar of metal pure

agasfer [191]

1. The bar of metal is not pure gold.

2. The volume of 50.0 g of air is 42,016 mL.

3. The mass of the pure aluminum is 135 g.

4. The light beam's wavelength in meters is 475 x $10^{-9$ m.

<h3>What is density?</h3>

The density of a substance is the ratio of the mass of the substance and its volume.

Density = mass/volume.

For the first problem: mass = 57.3 g, volume = 4.7 cm3

Density of the metal = 57.3/4.7

= 12.19 g/cm3

The density of gold is 19.3 g/cm3. Thus, the bar of metal is not pure gold.

For the second problem: density = 1.19 x $10^{-3$ g/ml, mass = 50.0 g

Volume = mass/density

= 50/1.19 x $10^{-3$

= 42,016 ml

The volume of 50.0 g of air is 42,016 mL.

For the third problem: density = 2.70 g/ml, volume = 50.0 ml.

Mass = density x volume

= 2.70 x 50

= 135 g

The mass of the pure aluminum is 135 g.

Lastly:

nano = $10^{-9$

475 nm = 475 x $10^{-9$ m

The light beam's wavelength in meters is 475 x $10^{-9$ m.

More on density can be found here: brainly.com/question/15164682

#SPJ1

6 0

1 year ago

Why do electrons keep moving around the nucleus and not away from the atom

igomit [66]

The atom's center, or nucleus, is positively charged and the electrons that whirl around this nucleus are negatively charged, so they attract each other. The reason the force is strong is because the atom is so small. The distance between the nucleus and the electrons is about 1 Angstrom (named after a famous scientist); this is 0.00000001 cm (10-8 cm) or about 4 billionths of an

7 0

3 years ago