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7 February, 18:50

Calculate the mass in grams for each of the following liquids.

Part A

280 mL of gasoline (d = 0.69 g/mL)

Express your answer to two significant figures and include the appropriate units.

Part B

190 mL of ethanol (d = 0.79 g/mL)

Express your answer to two significant figures and include the appropriate units.

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Answers (1)
  1. 7 February, 18:55
    0
    The density is calculated as mass per volume, so if we want to solve for mass, we would multiply density by volume.

    For Part A: if we have a density of 0.69 g/mL, and a volume of 280 mL, multiplying these will give a mass of: (0.69 g/mL) (280 mL) = 193.2 g. Rounded to 2 significant figures, this is 190 g gasoline.

    For Part B: if we have a density of 0.79 g/mL, and a volume of 190 mL, multiplying these will give a mass of: (0.79 g/mL) (190 mL) = 150.1 g. Rounded to 2 significant figures, this is equal to 150 g ethanol.
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