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13 October, 18:54

A student obtains a sample of liquid bromine at 20 degrees Celsius. She measures the volume to be 25.0cm³ and she looks up the density of bromine which is 3.1 g/cm³. How many moles are in the sample.

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  1. 13 October, 19:22
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    0.485 moles of Br₂ are in the sample

    Explanation:

    Density is a physic constant. It is specific to each substance or compound and as an intensive property, it varies with temperature

    Density = Mass / Volume

    Density of Br₂ = Mass of Br₂ / Volume of Br₂

    Therefore, Mass of Br₂ = Density of Br₂. Volume of Br₂

    Mass of Br₂ = 3.1 g/cm³. 25cm³ = 77.5 g

    Let's convert the mass to moles → 77.5 g / 159.8 g/mol = 0.485 moles
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