Chemistry HW Help?

[匿名]

2016-02-29 8:00 pm

(c) How many moles of product can be made from 2.4 mol B2 and 4.0 mol AB2?
(d) How many moles of excess reactant remain after the reaction in part (c)?
2AB2 +B2 → 2AB3

回答 (1)

賣女孩的火柴

2016-02-29 8:38 pm

✔ 最佳答案

(c)
2AB₂ + B₂ → 2AB₃
2 moles of AB₂ reacts with 1 moles of B₂ to give 2 moles of AB₃.

Initial no. of moles of AB₂ = 4.0 mol
Initial no. of moles of B₂ = 2.4 mol

When all AB₂ completely reacts :
No. of moles of B₂ needed = 4.0 × (1/2) = 2.0 mol < 2.4 mol
Thus, B₂ is in excess, and AB₂ is the limiting reactant.

No. of moles of AB₂ reacted = 4.0 mol
No. of moles of AB₃ formed = 4.0 × (2/2) = 4.0 mol

(d)
No. of moles of AB₂ reacted = 4.0 mol
No. of moles of B₂ reacted = 4.0 × (1/2) = 2.0 mol
No. of moles of excess B₂ remain after reaction = 2.4 - 2.0 = 0.4 mol

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