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4 years ago

How is the number of moles of an element determined from a known mass?

Chemistry

1 answer:

goblinko [34]4 years ago

4 0

the mass of 1 mole of the element is used as a conversion factor to convert grams to moles

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The cell wall in plants functions to prevent the cell membrane from breaking when too much water enters the cell. When too much

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3 years ago

The formula weight of a compound is determined by adding up the individual weights of every _______ in that compound.

Jlenok [28]

Answer:

C. Atom

The formula weight is calculated by the sum( adding) of the atomic masses for every atom in the formula

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3 years ago

Calculate the number of molecules in 4.0 mol H2O.

Juliette [100K]

1 mole H2O ---------------------- 6.02x10²³ molecules
4 moles H2O--------------------- y molecules

y = 4 * 6.02x10²³

y = 2.4x10^24 molecules

answer b

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3 years ago

What is one way compounds can be categoriezed

Katena32 [7]

Answer:

Explanation:

Compounds can be classified as ionic or covalent. Molecules are the simplest unit of a covalent compound, and molecules can be represented in many different ways.

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3 years ago

The different unit cell types have a different packing efficiency. The simple cubic has the least efficient packing and the face

kozerog [31]

Answer:

The answer is "52.8".

Explanation:

Please find the graph file in the attachment.

They have the atoms in 8 corners with one unit cell in an one so mesh (SCC).

Atoms throughout the corner contribute $\frac{1}{8}$ to both the cell unit

Atom number per SCC unit cell, $Z = (8 \times \frac{1}{8}) = 1$

Let 'r' become the atom's radius. $r = 3.43\times 10^{-8}\ \ cm$

We can see from the diagram that edge length $AB = a = 2r$

$Packing\ efficiency = \frac{(1 \ atom \ Volume \times Z)}{Volume \ of \ unit\ cell \times 100}\\\\$

$= \frac{\frac{4}{3}\times \pi \times r^3 \times 1}{a^3 \times 100}\\\\=\frac{\frac{4}{3}\times \pi \times r^3 \times 1}{(2r)^3 \times 100} \\\\=\frac{\frac{4}{3}\times \pi \times( 3.43\times 10^{-8}cm)^3 \times 1}{(2\times 3.43\times 10^{-8}cm)^3 \times 100}\\\\= 52.8 \%$

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3 years ago