5) Calculate the molality of 0.210 mol of KBr dissolved in 0.075kg pure
water?

Explanation:

The formula for molality is:

There are 0.210 moles of KBr and 0.075 kilograms of pure water.

Substitute the values into the formula.

Divide.

The molality is 2.8 moles per kilogram

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.  

cytokinesis is the splitting of a cell membrane to form 2 identical daughter cells. it's similar to mitosis as both cells have identical copies of dna and cytokinesis is a step in the mitotic cycle.