Answer:
20.0 drops.
Explanation:
- Firstly, we need to know the volume of the 15 drops that weigh 0.60 g.
- We can get the volume from the relation: d = m / V.
Where, d is the density (d = 0.80 g/ml),
m is the mass (m = 0.60 g),
V is the volume (??? ml)
∴ V = m / d = (0.60 g) / (0.80 g/ml) = 0.75 ml.
Using cross multiplication:
15.0 drops will dispense → 0.75 ml of ethanol.
??? drops will dispense → 1.0 ml of ethanol.
∴ The number of drops that will dispense 1.0 ml of ethanol = (1.0 ml) (15.0 drops) / (0.75 ml) = 20.0 drops.
