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a).When heated in a current of nitrogen gas, magnesium reacts to form a compound. Write the chemical equation of the compound formed.
(b) Calculate the volume of nitrogen at
s.t.p required to react with 0.72 g of magnesium.
(Mg = 24, molar gas volume at s.t.p = 22.4 dm3)

Answer Text:
a).#3Mg_(s)# + #N_2(g) #→ #Mg_3N_2(s)#
b).Mole Mg = #0.72/24 = 0.03#
Mole #N_2 = 0.03/3= 0.01#
Volume #N_2 = 22.4times 0.01 = 0.224 dm^3#