Question

If there are 4.214 x 1022 Molecules of Water in a sample of MgSO4●7H2O epsom salt What is the mass (in grams) of that sample of epsom salts?

Answer 1

In order to convert molecules to grams , we will do the following steps :

1. divide molecules / avagardos constant

= 4.214 x 1022 / 6.022x10^23

=2107/30.11 = 69.97 moles

2. atomic mass for MgSO4*7H2O =246g/mol

Mass = Moles * Molar mass

= 69.97 moles * 246g/mol

= 17212g of epsom salt .