Question

How many grams of Na2 O are produced when 2.70 moles Na react?

Answer 1

Solution:

1 moles of Na reacts to produce Na₂O, it will produce 1 moles of Na₂O.

So,

When 2.70 moles of Na reacts to produce Na₂O, it will produce 2.70 moles of Na₂O.

Molar mass of Na₂O = ( 2×atomic mass of Na + atomic mass of Oxygen ) g/mole

= (2×23+16) g/mole

= 62 g/mole

Mass of 1 mole of Na₂O = 62 g/mole

Mass of 2.70 mole of Na₂O = (62 g/mole × 2.70 mole )

= (62×2.70) g

= 167.4 g

Hence, 2.70 moles of Na reacts to produce 167.4 g of Na₂O.