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Fudgin [204]
3 years ago
15

38 An aluminum sample has a mass of 80.01 g and a density of 2.70 g/cm3. According to the data, to what number of significant fi

gures should the calculated volume of the aluminum sample be expressed?(1) 1 (3) 3
(2) 2 (4) 4
Chemistry
2 answers:
Rufina [12.5K]3 years ago
4 0

Answer:

C. 3

Explanation:

To determine the number of significant figures use this memory aid:  If the decimal is Absent count from the Atlantic (right side).  If the decimal is Present count from the Pacific (left side).   Start counting at the first non-zero digit.

The result of a calculation can only contain the lowest number of significant figures given in the problem.  2.70 has 3 significant figures.

Furkat [3]3 years ago
3 0
The answer is (3) 3. The calculation rule of significant figures is when multiplication and division, the significant figures of result is equal to the least of the numbers involved. The significant figure of 2.70 and 80.01 is 3 and 4.
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Answer:

Hydrofluoric acid.

Explanation:

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1. Acetic acid

Ka = 1.8x10^-5

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pKa = –logKa

pKa = –Log 1.8x10^-5

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2. Benzoic acid

Ka = 6.5x10^-5

pKa =..?

pKa = –logKa

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Ka = 6.8x10^-4

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pKa = 7.52

Note: the smaller the pKa value, the stronger the acid.

The pka of the various acids as calculated above is given below:

Acid >>>>>>>>>>>>>>>>>> pKa

1. Acetic acid >>>>>>>>>> 4.74

2. Benzoic acid >>>>>>>> 4.18

3. Hydrofluoric acid >>>> 3.17

4. Hypochlorous acid >> 7.52

From the above illustration, we can see that hydrofluoric acid has the lowest pKa value. Therefore, hydrofluoric acid is the strongest among them.

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