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21 July, 10:32

Rank the following samples in number of atoms from least to greatest. a) 1.5 mol of K atoms b) 64 g of S c) 20 g of Be d) 25 g of Na

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  1. 21 July, 12:29
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    Na < K < S < Be

    Explanation:

    Let's work with NA and molar mass of each.

    - 1.5 mol of K → should be converted to atoms (mol. NA)

    1.5 mol. 6.02*10²³ = 9.03*10²³ atoms of K

    - 64 g of S → should be converted to mol (mass / molar mass). Then, into atoms. (mol. NA)

    64 g / 32.06 g/m = 1.99 mol

    1.99 m. 6.02*10²³ = 1.20*10²⁴ atoms of S

    - 20 g of Be → should be converted to mol (mass / molar mass). Then, into atoms. (mol. NA)

    20 g / 9.01 g/m = 2.22 moles

    2.22 m. 6.02*10²³ = 1.33*10²⁴ atoms of Be

    - 25 g of Na → should be converted to mol (mass / molar mass). Then, into atoms. (mol. NA)

    25 g / 23 g/m = 1.08 moles

    1.08 m. 6.02*10²³ = 6.54*10²³ atoms of Na
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