An empty Erlenmeyer flask weighs 226.2 g. When filled with water (d = 1.00 g/cm3), the flask and its contents weigh 465.7 g.

Question

(a) What is the volume of water in the flask? Enter your answer in scientific notation.

 

_____ ×10_____cm³

 

(b) How much does the flask weigh when filled with the same volume of chloroform 

(d = 1.48 g/cm³)?

 ___g

Answer 1

Hi Matt,

Part A

Let's first find out how much water (by mass) we added into this Erlenmeyer flask.

m_water = m_{flask + water} - m_{empty flask}

Then, we can determine the volume of this water by a relation between mass and density (d) (density is given)

d_water = m_water / V_water

so

V_water = m_water / d_water

Part B

Let's find the mass of chloroform by first utilizing the fact that we are adding the same volume of chloroform as we did of water

V_chloroform = V_water

so

m_chloroform = d_chloroform * V_chloroform = d_chloroform * V_water

finally, they want us to calculate the mass of the flask containing chloroform

m_{flask + chloroform} = m_chloroform + m_{empty flask} = (d_chloroform * V_water) + m_{empty flask}