How many grams of water (H2O) have the same number of oxygen atoms as 7.0 mol of oxygen gas

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How many grams of water (H2O) have the same number of oxygen atoms as 7.0 mol of oxygen gas

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Gia Bảo 1 year 2021-08-06T13:25:16+00:00 1 Answers 114 views 0

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    2021-08-06T13:26:30+00:00

    Answer:

    126 g of water, H2O.

    Explanation:

    First, we’ll begin by calculating the number of atoms in 7 mole oxygen gas.

    This is illustrated below:

    From Avogadro’s hypothesis, we understood that 1 mole of any substance contains 6.02×10²³ atoms. This means that 1 mole of O2 also contains 6.02×10²³ atoms.

    Now, if 1 mole of O2 contains 6.02×10²³ atoms, then 7 moles of O2 will contain = 7 × 6.02×10²³ = 4.214×10²⁴ atoms.

    Finally, we shall determine the mass of H2O that will contain 4.214×10²⁴ atoms.

    This is illustrated below:

    6.02×10²³ atoms is present in 1 mole of any substance contains

    1 mole of H2O = (2×1) + 16 = 18 g

    6.02×10²³ atoms is present in 18 g of H2O.

    Therefore, 4.214×10²⁴ atoms will be present in = (4.214×10²⁴ × 18)/6.02×10²³

    = 126 g of water, H2O.

    Therefore, 126 g of water, H2O will contain the same number of oxygen atoms as 7.0 mol of oxygen gas.

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