Working on-board a research vessel somewhere at sea, you have (carefully) isolated 12.5 micrograms (12.5 ×10–6 g) of what you hope is pure saxitoxin (a non-electrolyte) from a poisonous (and quite cross) puffer fish. You dissolve this sample in 3.10 mL of water and determine that the osmotic pressure of the resulting solution is 0.236 torr at 19ºC (760 torr = 1.00 atm). What is the molar mass of the compound?

The value is

Explanation:

From the question we are told that

The mass of saxitoxin is

The volume of water is

The osmotic pressure is

The temperature is

Generally the osmotic pressure is mathematically represented as

Here R is the gas constant with value

and C is the concentration of saxitoxin

So

Generally the number of moles of saxitoxin is mathematically represented as

=>

=>

Generally the molar mass of saxitoxin is mathematically represented as

=>

=>

the answer is c. nacl