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Lubov Fominskaja [6]
3 years ago
15

Last year Elissa contributed 105 per month toward her 401 (k) account if her employer matches 15% of her contributions what was

the total amount contributed to the 401(k) at the end of the year
Advanced Placement (AP)
2 answers:
Ede4ka [16]3 years ago
8 0

Answer: $1449

Explanation:

We know that Elissa contributed $105 per month, if you think that in one year there are 12 months, then in one year Elissa contributed:

C = 12*$105 = $1260

And we also know that her employer also matched a 15% of her contributions.

a 15% of a number can be calculated as: 0.15 multiplied by the number, so a 15% of $1260 is equal to: 0.15*$1260 = $189

Then the total amount contributed is: $1260 + $189 = $1449

soldier1979 [14.2K]3 years ago
4 0
105 per month(12)= $1,260 (.15) =189

189 is the 15% times the total amount at the end of the year, (add) plus the year total and the total is 1,449 total.
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2 years ago
Remember from the buffering capacity note, tell me which of the following acids(and their salts) can make the best buffered solu
lakkis [162]

Answer:

The answer is Benzoic acid. Hence, (C) is the correct answer. The acid with the  ratio [HA] / [A-] closest to 1 is the best because a buffer is most effective when the amounts of acid and conjugate base are approximately equal and hence their ratio should be close to 1.

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pH = - log₁₀[H⁺]

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[HA] / [A-] = [H+] /Ka

Substituting the values,

For Chloroacetic acid, [HA] / [A-] = 5.011 x 10⁻⁵ / 1.35 x 10⁻³ => 0.037

For Propanoic acid,  [HA] / [A-] = 5.011 x 10⁻⁵ / 1.30 x 10⁻⁵ =>  3.85

For Benzoic acid,  [HA] / [A-] = 5.011 x 10⁻⁵ / 6.40 x 10⁻⁵ => 0.782

For Hypochlorous acid,  [HA] / [A-] = 5.011 x 10⁻⁵ / 3.50 x 10⁻⁸ => 1431.714

As Benzoic acid has  [HA] / [A-] value closest to 1, it can make the best buffered solution.

The acid with the

ratio [HA] / [A-] closest to 1 is the best because,

A buffer is most effective when the amounts of acid and conjugate base are approximately equal and hence their ratio should be close to 1.

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3 years ago
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Answer:

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