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Sliva [168]
3 years ago
5

3. The exosphere is the outer layer of the

Chemistry
1 answer:
barxatty [35]3 years ago
3 0

Answer:

D. exosphere is the outer layer of the thermosphere

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Why do group 7 elements have higher melting and boiling points going down?
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this is because the van der waals forces or also known as induced dipole-dipole interactions increase because more electrons are present within an atom as you go down

Explanation:

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Which of the following statements about alkenes is not correct?
professor190 [17]
<span>Option-C:  They react mainly by substitution.

Explanation:
                     
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8 0
2 years ago
4.81*10^24 atoms of lithium
enyata [817]

Answer:

Mass = 55.52 g

Explanation:

Given data:

Number of atoms of Li = 4.81×10²⁴ atom

Number of grams = ?

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

For example,

1.008 g of hydrogen = 1 mole = 6.022 × 10²³ atoms of hydrogen

For Li:

4.81×10²⁴ atom × 1 mol / 6.022 × 10²³ atom

8 moles

Mass in gram:

Mass = number of moles × molar mass

Mass = 8 mol × 6.94 g/mol

Mass = 55.52 g

4 0
3 years ago
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