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Robyn R. for tutoring lessons in Marriottsville MD Over 20 tutoring hours WyzAnt Tutoring Tutor Tutor United States

Robyn R.

Unique Eclectic Chemistry Tutor

Marriottsville, MD (21104)

Travel Radius 20 miles
Hourly Fee $30.00
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Robyn's Responses in WyzAnt Answers

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Algebra 1

solve for each equation for the variable indicated 1. s+4t= r is s2. 3m-7m= p for m

it sf or algebra 1

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Asked by Alisssa from Mountain Home A F B, ID
00

Robyn's Answer:

1. s + 4t = r

To solve for s (get it on one side), we subtract 4t from both sides to get:

s = r - 4t

2.  3m-7m = p

Since 3m and 7m both contain an m, we can combine them.

3-7= -4 so -4m = p

To solve for m, divide both sides by -4

m = -p/4

Solve the given equation for x.-3x=-21

Solve the given equation for x.-3x=-21

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Asked by Maritza from Palm Coast, FL
00

Robyn's Answer:

If you divide both sides by the -3 that is in front of the x, you get x = 7.

Chemistry

Consider the titration of 300.0 mL of 0.500 M NH3 (Kb = 1.8 ×10-5) with 0.500 M HNO3. At the stoichiometric point of this titration the pH is?

Consider the titration of 300.0 mL of 0.500 M NH3 (Kb = 1.8 ×10-5) with 0.500 M HNO3. At the stoichiometric point of this titration the pH is?

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Asked by Jose from Nashville, TN
01

Robyn's Answer:

The overall reaction is:

NH3 + HNO3 ---> NH4NO3

The Kb of NH3 refers to the reaction:

NH3 + H2O ---> NH4+ + OH-

The pKb = -log(Kb) = -log(1.8 x 10^-5) = 4.7

As a side note, my book says the Kb is actually 1.74 x 10^-5

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