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frosja888 [35]
3 years ago
13

4. What was life like for most of

Chemistry
1 answer:
Lady bird [3.3K]3 years ago
8 0

Answer:

no life at all

Explanation:

Coz our earth is too old and in compare to the period of organisms to the period when earth was just a rock, we found that there was no life for many years.

Hope it helps!

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What is 2.75 mol of O2
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Answer:

2,75 mol of O2 it's 88 g of O2.

Explanation:

The weight of the diatomic molecule O2 is 32 g/mol. So considering that, you should multiply 2,75 mol · 32 = 88g :)

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If 6.02×1023 atoms of element Y have a mass of 28.09 g, what is the identity of Y?
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Silicon is the element having a mass of 28.09 g

<u>Explanation</u>:

  • Silicon is the element having an atomic mass of 28.09 g / mol. So 28.09 g of silicon contains 6.023 \times 10^23 atoms. One mole of each element can produce one mole of compound.
  • The Atomic weight of an element can be determined by the number of protons and neutrons present in one atom of that element. So atomic weight expressed in grams always contain the same number of atoms( 6.023 \times10^23).
  • Avagadro number is the number of atoms of 1 mole of any gas at standard temperature and pressure. It has been determined that 6.023 \times 10^23 atoms of an element are equal to the average atomic mass of that element.
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