Set of lower level chemistry questions , chemistry homework help

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timer Asked: Jul 9th, 2017
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questions will be attached. I need detailed answers with all step of solving the q

Set of lower level chemistry questions , chemistry homework help
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Set of lower level chemistry questions , chemistry homework help
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Set of lower level chemistry questions , chemistry homework help
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Set of lower level chemistry questions , chemistry homework help
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Set of lower level chemistry questions , chemistry homework help
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Tutor Answer

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 ofπ‘΅π‘Άβˆ’
𝟐:
Shape: bent or angular.
Polarity: NOβˆ’
2 is polar.

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

2. Angle= 109.5Β°

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:
π‘ͺπŸ‘ π‘―πŸ– + πŸ“ π‘ΆπŸ β†’ πŸ‘ π‘ͺπ‘ΆπŸ + πŸ’ π‘―πŸ 𝑢
Molar mass of propane=Mass / Molar Mass=3Γ—12 + 8Γ—1 = 44 π‘”π‘š
Number of moles of propane10 Γ· 44 = 0.227 π‘šπ‘œπ‘™π‘’
1π‘šπ‘œπ‘™π‘’ π‘œπ‘“ 𝐢3 𝐻8 β†’ 5 π‘šπ‘œπ‘™π‘’π‘  π‘œπ‘“ 𝑂2
0.227 π‘šπ‘œπ‘™π‘’ π‘œπ‘“ 𝐢3 𝐻8 β†’ π‘₯ π‘šπ‘œπ‘™π‘’π‘  π‘œπ‘“ 𝑂2

Then: π‘₯ =

5Γ—0.227
1

= 1.135 π‘šπ‘œπ‘™π‘’π‘ 

Molar mass of oxygen=2Γ—16 = 32 π‘”π‘š
Mass of needed oxygen= Molar mass of oxygenΓ— Number of moles
=32Γ—1.135 = πŸ‘πŸ”. πŸ‘πŸ π’ˆπ’Ž
5. Molar mass of magnesium chloride (𝑀𝑔𝐢𝑙2 ) 24 + 2Γ—35 = 94 π‘”π‘š
Number of moles= Mass ...

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Anonymous
Good stuff. Would use again.

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