A lit candle needs to draw oxygen from the air in order to continue burning. ... Thus, oxygen inside the glass jar will decrease and it gets filled with carbon dioxide, and eventually the candle's flame will Extinguish.
130.954g of Fe2O3 in 0.82 mol
Control: skunk
Independent: poking (the skunk)
dependent: emission of toxic fumes
Answer: (D) 0.025 mol 
Explanation:
The given balanced equation is :
According to stoichiometry :
4 moles of ammonia 
reacts with = 5 moles of oxygen 
Thus 0.30 moles of ammonia reacts with = 
moles of oxygen
Now as given moles of oxygen are more than the required amount, oxygen is the excess reagent.
moles of oxygen left = 0.40 - 0.375 = 0.025
Thus 0.025 mol excess reagent remains.
Answer:
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