Magnesium Burns in Air with a Dazzling Brilliance to Produce

Multiple Choice

Magnesium burns in air with a dazzling brilliance to produce magnesium oxide:
2Mg (s) + O₂ (g) - 2MgO (s)
How many moles of O₂ are consumed when 0.770 mol of magnesium burns?

A) 1.54
B) 0.385
C) 2.60
D) 0.770
E) 0.0317