Question

A large organic molecule has a mass of 1.50×10−21 kg .

What is the molar mass of this compound?

Answer 1

Here we are given actual mass of molecule in kg which is very very small. Since the number is extremely small and so we can use amu and kg relation.

We know 1 amu = 1.660540 E-27 kg

Lets calculate amu in given mass

= 1.50 E -21 kg x 1 amu/ 1.660540 E -27

= 903320.6065 amu

Now when we have to write molar mass then we use gram molar mass.

This means that amu is expressed in gram.

So the molar mass of this large organic molecule would be = 903320.61 g /mol

Or we can write it in scientific notation.

9.03 E 5 g/mol