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martinezarielys17
22.06.2019 •
Chemistry
How many moles of no2 will form when 3.3 moles of cu are reacted with excess hno3?
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Ответ:
6.6 moles.
Explanation:
It is a stichiometric oriented problem.We need to write the balanced chemical equation of the reaction:Cu + 4HNO₃ → Cu(NO₃)₂ + 2NO₂ + 2H₂O.
It is clear that 1.0 mole of Cu reacts with 4.0 moles of 4HNO₃ to produce 1.0 mole of Cu(NO₃)₂, 2.0 moles of NO₂, and 2.0 moles of water.Now, using cross multiplication:
1.0 mole of Cu produces → 2.0 moles of NO₂, from the stichiometry,
∴ 3.3 moles of Cu produces → ??? moles of NO₂.
∴ the number of moles of NO₂ will form when 3.3 moles of Cu are reacted with excess HNO₃ is = (3.3 moles of Cu) (2.0 moles of NO₂) / (1.0 mole of Cu ) = 6.6 moles.
Ответ:
4 moles
Explanation:
From the balanced chemical equation, it can be seen that 6 moles of lithium react with 1 mole of nitrogen to give 2 moles of lithium nitride.
Now as nitrogen is in excess, lithium is the limiting reagent as it limits the formation of products.
As 6 moles of lithium produce 2 moles of lithium nitride.
12 moles of lithium will produce=
of lithium nitride.