Question

a 25 - ml volumetric flask (25.00 ml) with its stopper has a mass of 21.9290 g. the same flask, filled to the line with an ethylene glycol (c₂h₆o₂, automotive antifreeze) solution, has a mass of 34.7748 g.
what is the density of the ethylene glycol solution?
enter an integer or decimal number with units, with exactly 4 significant figures more...
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Explanation:

Step1: Calculate the mass of the solution

The mass of the solution \(m\) is the mass of the flask with solution minus the mass of the empty flask.
\(m = 34.7748\ \text{g}-21.9290\ \text{g}=12.8458\ \text{g}\)

Step2: Use the density formula

The density formula is \(
ho=\frac{m}{V}\), where \(V = 25.00\ \text{mL}\) (volume of the flask).
\(
ho=\frac{12.8458\ \text{g}}{25.00\ \text{mL}} = 0.513832\ \text{g/mL}\)
Rounding to 4 significant figures: \(
ho = 0.5138\ \text{g/mL}\)

Answer:

\(0.5138\ \text{g/mL}\)