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3 years ago

What is Avogadro's number?

Chemistry

1 answer:

Mrac [35]3 years ago

7 0

Answer:

sometimes called a mole, it is a conversion number that allows a chemistry student to move from the microscopic world of atoms, ions, and molecules to the macroscopic world of grams, kilograms, and tons.

Explanation:

the easier definition is: the number of atoms and/or molecules in one mole of a substance is equal to 6.023 X $10^{23}$

Hope this helped :)

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In physical changes, the atoms or molecules that compose the matter do not change their identity, even though the matter may cha

aalyn [17]

True. Physical changes only affect the inter-molecular bonding and structure.

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3 years ago

Be sure to answer all parts.

Natali5045456 [20]

Answer:

38.7%

41.3%

20%

Explanation:

The percentage composition helps to know the what percent of the total mass of a compound is made up of each of the constituent elements or groups.

To solve this problem:

find the formula mass by adding the atomic masses of the atoms that makes up the compound.
place the mass contribution of the element or group to the formula mas and multiply by 100;

Compound:

Ca₃(PO₄)₂

Formula mass = 3(40) + 2[31 + 4(16)]

= 120 + 2(95)

= 120 + 190

= 310

%C = $\frac{3(40)}{310}$ x 100 = 38.7%

%P = $\frac{8(16)}{310}$ x 100 = 41.3%

%O = $\frac{2(31)}{310}$ x 200 = 20%

8 0

3 years ago

Which of the following terms is a term that could refer to heterogeneous matter? a. element b. mixture c. compound d. solution

kupik [55]

Answer : b. mixture

<h3>Further explanation</h3>

Element and compound are included in pure substance where the composition is the same in each part

Elements are made up of 1 type of atom, while the compounds of 2 or more types of atoms , both can be represented in the form of chemical symbols

A mixture is a combination of substances. The properties of a substance in the mixture component are unchanged

The mixture can be a homogeneous mixture or a heterogeneous mixture

the homogeneous mixture if each part has the same composition

the heterogeneous mixture if each part has a different composition

Solution including into Homogeneous mixture, while suspension into a heterogeneous mixture

So a term that could refer to heterogeneous matter : b. mixture

6 0

3 years ago

A 1.25 g gas sample occupies 663 ml at 25∘ c and 1.00 atm. what is the molar mass of the gas?

lakkis [162]

Using ideal gas equation,

$P\times V=n\times R\times T$

Here,

P denotes pressure

V denotes volume

n denotes number of moles of gas

R denotes gas constant

T denotes temperature

The values at STP will be:

P=1 atm

T=25 C+273 K =298.15K

V=663 ml=0.663L

R=0.0821 atm L mol ⁻¹

Mass of gas given=1.25 g g

Molar mass of gas given=?

$Number of moles of gas, n= \frac{Given mass of the gas}{Molar mass of the gas}$

$Number of moles of gas, n= \frac{1.25}{Molar mass of the gas}$

Putting all the values in the above equation,

$1\times 0.663=\frac{1.25}{Molar mass of the gas}\times 0.0821\times 298.15$

Molar mass of the gas=46.15

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4 years ago