**Calculate the mass of 1.00 times 1024 (a septillion) molecules of water.**

**Answer:**

- water weights 18 gm per mol.

so mass of given water = 10/6 *18 = 30gm - There are 24x10^23 atoms in 58 gm of butane

so for 1 gm = 24x10^23/58 = 4.137

**Calculate the mass of 1.00 times 1024 (a septillion) molecules of water.**

**Answer:**

- water weights 18 gm per mol.

so mass of given water = 10/6 *18 = 30gm - There are 24x10^23 atoms in 58 gm of butane

so for 1 gm = 24x10^23/58 = 4.137