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5 April, 21:32

How many carbon atoms are present in a 10.0g sample of C3H8

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Answers (2)
  1. 5 April, 22:14
    0
    4.09ₓ10²³ atoms are contained in 10g of C₃H₈

    Explanation:

    1 mol of C₃H₈ has 3 mol of carbon and 8 mol of hydrogen.

    1 mol of C₃H₈ weighs 44 g

    In 44 g of C₃H₈ we have 3 mol of C

    In 10 g of C₃H₈ we'll have (10. 3) / 44 = 0.681 mol

    1 mol of C has NA (6.02x10²³) particles

    0.681 mol will have (0.681. 6.02x10²³) = 4.09ₓ10²³ atoms
  2. 6 April, 00:19
    0
    There are 4.1 * 10^23 carbon atoms in 10.0 grams of C3H8

    Explanation:

    Step 1: Data given

    Mass of C3H8

    Molar mass of C3H8 = 44.1 g/mol

    Number of Avogadro = 6.022 * 10^23 / mol

    Step 2: Calculate number of moles

    Number of moles = mass / molar mass

    Number of moles C3H8 = 10.0 grams / 44.1 g/mol

    Number of moles C3H8 = 0.227 moles

    Step 3: Calculate number moles of carbon

    For 1 mol C3H8 we have 3 moles of carbon

    For 0.227 moles of C3H8 we have 3*0.227 = 0.681 moles

    Step 4: Calculate number of carbon atoms

    Number of carbon atoms = 0.681 moles * 6.022 * 10^23

    Number of carbon atoms = 4.1 * 10^23 carbon atoms

    There are 4.1 * 10^23 carbon atoms in 10.0 grams of C3H8
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