Question

516 mL of ethyl alcohol with a density of 0.789gmL is poured into a beaker with a mass of 0.245 kg and then weighed on a scale. How many grams will the scale read?

Answer 1

516 mL of ethyl alcohol with a density of 0.789g/mL is poured into a beaker with a mass of 0.245 kg and then weighed on a scale. How many grams will the scale read?

Solution:

Use the formula for calculating mass through volume and density:

$$\begin{array}{l} m = p \cdot V, \\ m (C_2H_5OH) = 516 \, \text{mL} \times 0.789 \, \text{g/mL} = \\ = 407.124 \, \text{g} \\ \text{if } m(\text{beaker}) = 0.245 \, \text{kg} = 245 \, \text{g}, \\ \text{then } m(\text{total}) = 652.124 \, \text{g}. \end{array}$$

Answer: 652.124g.

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