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Marta_Voda [28]
3 years ago
13

Archaeology has shown that ancient people _____.

Chemistry
2 answers:
Readme [11.4K]3 years ago
6 0
I would say developed technologies which somehow were lost

like the stone age: the stone hammer, who used that afterwards in the roman empire era and stuff?
Nady [450]3 years ago
3 0

Answer:

The correct answer will be options-

1. had understanding of scientific principles.

2. had understanding of scientific principles.

3. developed technologies which somehow were lost.

Explanation:

The ancient people are considered primitive in the sense that they lived during the time when they started understanding the world to exploit it. Scientifically they were all considered modern humans as they possessed the brain with the same capacity as we have that is 1500 cc.

The collected evidence show that they formed the earlier civilizations on earth and were aware of their natural world in which they were living and tried to understand the world so they can exploit nature.

The developed the scientific principles, developed the language of mathematics for business and the better economy as well as tools and techniques which helped their survival which was lost.

Thus, the selected options are the correct answer.

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solution contains 174 grams of lithium bromide in 360 grams of water, what is the mole fraction of lithium bromide
Luba_88 [7]

Answer:

       \large\boxed{\large\boxed{0.091}}

Explanation:

The<em> mole fraction</em> of a component in a mixture is the number of moles of the component divided by the total number of moles of all the components, multiplied by 100.

The symbol X is used to represent the mole fraction.

            X_A=\dfrac{\text{number of moles of component A}}{\text{number of moles of all the components}}\times 100

<u />

<u>1. Convert masses in grams to number of moles</u>

Formula:

  • number of moles = mass in grams / molar mass

a) Lithium bromide

  • Chemical Formula: LiBr
  • Molar mass: 86.845 g/mol

       \text{Number of moles}=\dfrac{174g}{86.845g/mol}=2.00mol

b) Water

  • Chemical formula: H₂O
  • Molar mass: 18.015 g/mol

      \text{Number of moles}=\dfrac{360g}{18.015g/mol}=19.98mol\approx 20.0mol

c) Total number of moles = 2.00 mol + 20.0 mol = 22.0 mol

<u>2. Mole fraction of lithium bromide</u>

           \text{Mole fraction of lithium bromide}=\dfrac{2.00}{22.0}=0.091

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