# An aqueous solution containing 1.00 g of bovine insulin (a protein, not ionized) per liter has an osmotic pressure of 3.1 mm Hg at 25 °C. How do you calculate the molar mass of bovine insulin?

##### 1 Answer

The molar mass is

#### Explanation:

The formula for osmotic pressure

#color(blue)(bar(ul(|color(white)(a/a)Pi = cRTcolor(white)(a/a)|)))" "#

where

Since

#Pi = (nRT)/V#

Since

#Pi = (nRT)/(MV)#

We can solve this equation for the molar mass and get

#color(blue)(bar(ul(|color(white)(a/a)M=(mRT)/(PiV)color(white)(a/a)|)))" "#

In this problem

∴