Hydrazine, N2H4, is a colorless, oily liquid that fumes in air and has an odor much like that of ammonia. It is used as a rocket
fuel. The order of its atoms is H2NNH2. How many unshared pairs of electrons are on each nitrogen atom?
1 answer:
Answer:
1 unshared pair of electrons
Explanation:
In order to draw the Lewis structure, we need to consider the octet rule: atoms tend to share electrons to complete their valence shell with 8 electrons. In the case of H, it has to complete a duet (2 valence electrons).
N has 5 valence electrons, so it has to share 3 pairs of electrons to reach the octet.
H has 1 valence electron, so it has to share 1 pair of electrons to reach the duet.
In the picture, we can see the resulting Lewis structure. There is 1 unshared pair of electrons on each nitrogen.
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Answer:
B. The student chose the correct tile, but needs to flip the tile to make the units cancel
Explanation:
Based on the reaction:
2AgNO₃(aq) + Cu(s) → 2Ag(s) + Cu(NO₃)₂ (aq)
<em>2 moles of AgNO₃ react per mole of Cu producing 2 moles of Ag and 1 mole of Cu(NO₃)₂</em>
Thus, if you want to produce 6.75moles of Cu(NO₃)₂ you need:
= 13.50 moles of AgNO₃ are needed
Thus, if you analize the tile shown by the student:
<em>B. The student chose the correct tile, but needs to flip the tile to make the units cancel</em>