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Hoochie [10]
3 years ago
15

Solid substance A has a melting point of 100°C. Liquid substance B has a freezing point of 110°C. For each substance, identify i

ts state of matter and describe the motion of its particles when the substance is at 115°C.
Chemistry
1 answer:
9966 [12]3 years ago
4 0

Answer:

both will be at liquid state. the particles will move rapidly in all directions and will collide with other particles in random motion

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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

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