 # Set of lower level chemistry questions , chemistry homework help Anonymous
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questions will be attached. I need detailed answers with all step of solving the q img_0980.jpg img_0981.jpg img_0982.jpg img_0983.jpg img_0984.jpg

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MohamedAbdo
School: UC Berkeley   Here are the answers, please tell me if you have any problem.

1.
a) Lewis structure of NCl3:
Shape: trigonal pyramidal
Polarity: NCl3is polar.

b) Lewis structure of𝑵𝑶−
𝟐:
Shape: bent or angular.
Polarity: NO−
2 is polar.

c) Lewis structure of CH2Cl2:
Shape: tetrahedral geometry, with bonding angle of 109.5°
Polarity: CH2Cl2 is relatively polar.

2. Angle= 109.5°

3. 2 liters. Because 1 mole of 𝑁2 𝑂4 gives two moles of 𝑁𝑂2 (and both are
gases and at the same temperature and pressure the ratio between the
number of moles equal the ratio of the volume of the gases).

4. The balanced equation:
𝑪𝟑 𝑯𝟖 + 𝟓 𝑶𝟐 → 𝟑 𝑪𝑶𝟐 + 𝟒 𝑯𝟐 𝑶
Molar mass of propane=Mass / Molar Mass=3×12 + 8×1 = 44 𝑔𝑚
Number of moles of propane10 ÷ 44 = 0.227 𝑚𝑜𝑙𝑒
1𝑚𝑜𝑙𝑒 𝑜𝑓 𝐶3 𝐻8 → 5 𝑚𝑜𝑙𝑒𝑠 𝑜𝑓 𝑂2
0.227 𝑚𝑜𝑙𝑒 𝑜𝑓 𝐶3 𝐻8 → 𝑥 𝑚𝑜𝑙𝑒𝑠 𝑜𝑓 𝑂2

Then: 𝑥 =

5×0.227
1

= 1.135 𝑚𝑜𝑙𝑒𝑠

Molar mass of oxygen=2×16 = 32 𝑔𝑚
Mass of needed oxygen= Molar mass of oxygen× Number of moles
=32×1.135 = 𝟑𝟔. 𝟑𝟐 𝒈𝒎
5. Molar mass of magnesium chloride (𝑀𝑔𝐶𝑙2 ) 24 + 2×35 = 94 𝑔𝑚
Number of moles= Mass ...

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Good stuff. Would use again. Brown University

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