Question

15 drops of ethanol from a medicine dropper weigh 0•60g, how many drops does it take from a dropper to dispense 1•0mL ethanol? The density of ethanol is 0•80g

Answer 1

20 drops of ethanol dispensed by dropper will be 1.0 mL ethanol.

Step-by-step explanation:

Mass of 15 drops of ethanol = 0.60 g

Mass of 1 drop of an ethanol =
`(0.60 g)/(15)=0.04 g`

Mass of 1.0 mL of ethanol = m

Volume of ethanol = 1.0 mL

Density of an ethanol = d = 0.80 g/ml

`m = d* V =0.80 g/mL* 1.0 mL=0.80 g`

Number of drops in 0.80 g of ethanol = x

`x* 0.04 g=0.80 g`

`x=(0.80 g)/(0.04g)=20`

20 drops of ethanol dispensed by dropper will be 1.0 mL ethanol.