# An empty erlenmeyer flask weighs 241.3 g. when filled with water (d = 1.00 g/cm3), the flask and its contents weigh 489.1 g. what

An empty erlenmeyer flask weighs 241.3 g. when filled with water (d = 1.00 g/cm3), the flask and its contents weigh 489.1 g. what is the flask's volume? how much does the flask weigh when filled with chloroform (d = 1.48 g/cm3)?

flask volume =247.8 cm³total weight = 608.044 g

Explanation:

Part a.

Data Given:

weight of the flask = 241.3 g

weight of water and flask = 489.1 g

density of water = 1 g/cm³

Solution:

As we know that the volume of the Erlenmeyer flask is the volume of water that occupied by it.

for this first we have to find mass of the water in the Erlenmeyer flask

This can be calculated by the subtraction of flask's weight from the weight of flask and water.

weight of water (m) = total weight  - weight of flask

put values in the above formula

weight of water (m) = 489.1 g -  241.3 g

weight of water (m) = 489.1 g -  241.3 g

weight of water (m) = 247.8 g

To find volume we will use density formula

d = m/v

rearrange the above equation to calculate volume

v = m/d . . .  . . . . (1)

put values in equation 1

v = 247.8 g / 1 g/cm³

v = 247.8 cm³

The volume of the Erlenmeyer flask = 247.8 cm³

Part b.

Data Given:

density of ethanol = 1.48 g/cm³

mass of the flask when filled with ethanol = ?

Solution:

To find mass we will use density formula

d = m/v

rearrange the above equation to calculate mass

m = d x v . . .  . . . . (2)

The volume of ethanol is equal to the volume of Erlenmeyer flask that is calculated in part 1

So,

Volume of ethanol = 247.8 g

Put values in formula 2

m = 1.48 g/cm³ x 247.8 g

m = 366.744 g

Now,

To calculate total mass of the flask when filled with ethanol.

total weight = weight of Erlenmeyer flask + weight of ethanol

Put the value in above equation

total weight = 366.744 g + 241.3 g

total weight = 608.044 g

So

Total weight of flask and ethanol = 608.044 g

The volume of the flask would simply be equal to the volume of the water. And the mass of the water would be the difference after and before weigh.

mass of water = 489.1 g – 241.3 g

mass of water = 247.8 g

Therefore the volume of water (which is also the volume of the flask) is:

volume = 247.8 g / (1.00 g/cm^3)

volume = 247.8 cm^3

The total mass of the flash when filled with chloroform would be:

total mass with chloroform = 241.3 g + 247.8 cm^3 (1.48 g/cm3)

total mass with chloroform = 608.04 g