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Chemistry

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1. A piece of rectangular wood that measures 3.0 cm by 6.0 cm by 4.0 cm has a mass of 80.0 grams. What is the density of the wood? Would the piece of wood float in water?

2. I threw a plastic ball in the pool for my dog to fetch. The mass of the ball was 125g. What must the volume be to have a density of 0.500 g/mL?

  • Chemistry -

    #1.
    Recall that the density of a material is just
    d = m/V
    where:
    m = mass
    V = volume
    Also, the volume of a rectangular solid is given by
    V = l*w*h
    where:
    l = length
    w = width
    h = height
    Substituting,
    d = 80 / (3*6*4)
    d = 80 / 72
    d = 1.11 g / cm^3

    No, it will NOT float because the density of wood is greater than density of water (which is approximately 1 g /cm^3 at standard temperature & pressure)

    #2.
    d = m/V
    V = m/d
    V = 125 / 0.5
    V = 250 mL

    Hope this helps~ :)

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