Question

One container says that 50 moles of magnesium when new however, the container had been partially used. Now weighs 350 grams of magnesium. How many moles were used?

Answer 1

35.42 moles of magnesium are used.

Step-by-step explanation:

Initial amount of moles ion container = 50 moles

Final moles of magnesium left in the container : n

Mass of the magnesium after partial use = 350 g

`n=(350 g)/(24 g/mol)=14.58 mol`

Moles of magnesium used :

= Initial moles of magnesium left - final moles of magnesium

= 50 moles - 14.58 moles = 35.42 moles

35.42 moles of magnesium are used.