A gas cylinder contains exactly 15 moles of oxygen gas (O2). How many molecules of oxygen are in the cylinder

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A gas cylinder contains exactly 15 moles of oxygen gas (O2). How many molecules of oxygen are in the cylinder

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Thu Thủy 5 months 2021-08-05T16:59:48+00:00 1 Answers 52 views 0

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  1. diemkieu
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    2021-08-05T17:00:56+00:00
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    Answer:

    Explanation:

    The answer is 9.03 × 10²⁴ molecules.

    Avogadro’s number is the number of units (atoms, molecules) in 1 mole of substance.

    Make the proportion.

    6.02 × 10²³ molecules per 1 mol

    x per 15 mol

    6.02 × 10²³ molecules : 1 mol = x : 15 mol

    x = 6.02 × 10²³ molecules * 15 mol * 1 mol

    x = 90.3 × 10²³ molecules

    x = 9.03 × 10 × 10²³ molecules

    x = 9.03 × 10²³⁺¹ molecules

    x = 9.03 × 10²⁴ molecules

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )