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Sagot :
Answer:5 F2 (g) + 2 NH3 (g) -> N2F4 (g) + 6 HF (g)
Explanation:moles = mass/molar mass
mass =molar mass x mole
a) moles of Nh3 = 58.5/17 = 3.44 moles
the mole ratio of F2:NH3 = 5:2
the moles of F2 =3.44x5/2=8.6 moles
mass= 8.6 x 38 = 326.8 grams of F2
B) moles of Hf = 3.89/20 = 0.1945 moles
mole ratio NH3:Hf= 2:6
moles of NH3 = 0.1945 x2/6 = 0.0648 moles
mass =0.0648 x17 = 1.102 grams of NH3
C) moles of f2 = 217/38 =5.711 moles
mole ratio N2F6:F2 =5:1
moles of N2F4=5.711 x1/5=1.142 moles
mass = 1.142 x104 = 118.77 grams of N2F4
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