The number of atoms in a 158.4 g sample of CO2 gas at STP is: 1.277 x 1025 atoms 2.167 x 1024 atoms 6.50

Question

The number of atoms in a 158.4 g sample of CO2 gas at STP is:

1.277 x 1025 atoms

2.167 x 1024 atoms

6.502 x 1024 atoms

6.651 x 1024 atoms

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Edana Edana 3 years 2021-08-24T11:28:23+00:00 1 Answers 101 views 0

Answers ( )

  1. thucuc
    0
    2021-08-24T11:29:52+00:00
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    Answer:

    6.502 x 10²⁴ atoms.

    Explanation:

    First we convert 158.4 g of CO₂ into moles, using carbon dioxide’s molar mass:

    • 158.4 g ÷ 44 g/mol = 3.6 mol CO₂

    Then we calculate how many CO₂ molecules are there in 3.6 moles, using Avogadro’s number:

    • 3.6 mol CO₂ * 6.023×10²³ molecules/mol = 2.168×10²⁴ CO₂ molecules

    As there are 3 atoms per CO₂ molecule, we triple the number of CO₂ molecules in order to get the answer:

    • 2.168×10²⁴ CO₂ molecules * 3 = 6.504×10²⁴ atoms

    The closest answer is the third option,  6.502 x 10²⁴ atoms.

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