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Number of moles in a mass given in kg

The same question, asked 3 times: 2 May 2023 S2*, 4 May 2023 S2*, 16 May 2023 S1. Every wording below, oldest first.

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  1. Question 1

    2 May 2023 S2

    83
    How many moles of carbon atoms are present in 3.6 kg of carbon?

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  2. Question 2

    4 May 2023 S2

    65
    Calculate number of moles present in 9.10×10−29.10\times10^{-2} kg of water.

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  3. Question 3

    16 May 2023 S1

    84
    Find the number of moles of sodium atoms in 6.9×10−2 kg6.9 \times 10^{-2}\,\text{kg} (Atomic mass =23 g mol−1= 23\,\text{g mol}^{-1})

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