How many grams of NaCl are in 1.25 X 1024 molecules of Naci? Use one decimal place

Question

How many grams of NaCl are in 1.25 X 1024
molecules of Naci? Use one decimal place

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Eirian 4 years 2021-08-01T16:47:29+00:00 1 Answers 12 views 0

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  1. Nick
    0
    2021-08-01T16:48:37+00:00
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    Answer:

    121.1g

    Explanation:

    First, we need to convert the number of molecules of NaCl to moles (n) by dividing by Avagadro number

    That is, n = number of molecules ÷ 6.02 × 10²³

    n = 1.25 X 10²⁴ ÷ 6.02 × 10²³

    n = 1.25/6.02 × 10^ (24-23)

    n = 0.207 × 10¹

    n = 2.07moles

    Using the formula; mole = mass ÷ molar mass

    Molar mass of NaCl = 23 + 35.5 = 58.5g/mol

    mass = molar mass × mole

    mass = 58.5 × 2.07

    mass = 121.1g

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