Solving some problems and questions, chemistry homework help

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15. (3) What is the pH of a solution where [HT] =1x 10M? This solution is acidic basic or neutral (circle one). 16. (3) What is the pH of a solution where [OH] = 1 x 10 M? 3 Hence, this solution is acidic, basic or neutral (circle one). 19.(5) A solution is prepared by dissolving 0.8091 moles of HBr in water until the final volume is 10.0 Liters. What is the molarity of the solution and what is its pH? 20.(8) Name each of the following acids and bases: a. H2SO4 b. H3PO4 E b. NH3 c. Mg(OH)2 name 1.(9) For each of the following molecules, give the Lewis structure (lines for bonded pails, dots for lone pairs) and the shape and the polarity of the molecule. c. OBr2 a. SO3 年 c. CHCl3 2. (3) Draw the Lewis structure for the ion soz-. What is the bond angle, approximately, for this ion? 22. (9) Complete the following neutralization reaction by giving the formulas for the products, making sure the reaction is balanced: Mg(OH)2 НСІ + NaOH H2SO4 1 НСІ + CaCO3 6.(5) The overall gas-producing reaction in an air bag is: 10 NaNz + 2 KNO3 → K20 + 5 Na2O + 16 N2 Imagine an air bag requires 182 g of nitrogen gas to inflate properly. How many grams of NaN; (called sodium azide) are needed to provide this much nitrogen gas? 7.(4) You are told to prepare a 5.0% by mass soap solution in water. If you have 12 grams of soap, how much water in grams must be added to it to make a 5.0% by mass solution? her NO z 8. (2) Circle yes or no for the following statement: Hexane (CH 4) will dissolve easily in water. YES 9. (3) What kind of van der Waals forces would be present in the molecule CHz(CH2)75CH3? 3 Would you expect it to be a gas at room temperature? (The part of the molecule written as (CH2)75 means there are 75 carbons in a chain, each carbon bonded to two hydrogen atoms.)
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Explanation & Answer

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1)
a. Lewis structure of SO3:
Shape: trigonal planar with symmetric charge distribution on the central atom
with bonding angle of 120°
Polarity: SO3 is nonpolar.

b. Lewis structure of OBr2:
Shape: bent or angular with bonding angle 0f 104.5° like the geometry of water
molecule.
Polarity: OBr2 is polar. Oxygen atom is partially negative and bromine atoms are
partially positive.

c. Lewis structure of CHCl3:
Shape: tetrahedral geometry, with bonding angle of 109.5°
Polarity: slightly polar. C-H bond is non polar, but C-Cl bond is slightly polar.

2) Lewis structure of𝑺𝑶−𝟐
𝟑 :
The bond angle is 109.5° approximately as its geometry is trigonal pyramid.

6) The molar mass of N2= 28 gm, so 182 g of N2 is equal to

182
28

= 6.5 𝑚𝑜𝑙𝑒𝑠

from the given equation: 10 moles of NaN3 gives 16 moles of N2, so the number of
moles of NaN3 which gives 6.5 moles of N2 equal

6.5×10
16

= 4.0625 𝑚𝑜𝑙𝑒𝑠

10 → 16
𝑥 →...


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