Question

If 15 drops of ethanol from a medical dropper weight 0.60g, how many drops does it takes from a dropper to dispense 1.0ml of ethanol? The density of ethanol is 0.80g/ml

Answer 1

Answer : The number of drops it takes from a dropper to dispense 1.0 ml of ethanol is, 20 drops

Solution : Given,

Density of ethanol = 0.80 g/ml

Mass of ethanol = 0.60 g

First we have to calculate the volume of ethanol.

Formula used : $Density=\frac{Mass}{Volume}$

$0.80g/ml=\frac{0.60g}{Volume}$

$Volume=\frac{0.60g}{0.80g/ml}=0.75ml$

The volume of ethanol is, 0.75 ml

Now we have to calculate the number of drops it takes from a dropper to dispense 1 ml of ethanol.

As, the number of drops in 0.75 ml of ethanol = 15

So, the number of drops in 1.0 ml of ethanol = $\frac{15}{0.75}\times 1.0=20$

Therefore, the number of drops it takes from a dropper to dispense 1.0 ml of ethanol is, 20 drops