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inn [45]
3 years ago
8

An object was measured by a worker as

Chemistry
2 answers:
Lapatulllka [165]3 years ago
8 0

Answer: The percent error in the worker's measurement is 1.38%

Explanation:

Actual length of the object = 14.4 cm

length measured by the worker = 14.6 cm

absolute error in measuring the object = 14.6 - 14. 4 = 0.2 cm

percentage error =\frac{\text {absolute error}}{\text {actual length}}\times 100\%

Putting in the values we get:

percentage error =\frac{0.2}{14.4}\times 100\%=1.38\%

Thus the percent error in the worker's measurement is 1.38%

marusya05 [52]3 years ago
6 0
<h2>Answer - 0.73%</h2>

14.6            .2

          =          

100              x

(Above is proportions I used to get the answer)

x = 0.73% which is the answer.

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An effective weak acid-conjugate base buffer should have pH equal to pK_{a} of the weak acid. For buffers with the same pH, higher the concentrations of the components in a buffer, higher will the buffer capacity.

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pH=pK_{a}(CH_{3}COOH)+log\frac{[CH_{3}COO^{-}]}{[CH_{3}COOH]}

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Buffer A:    pH=4.74+log(\frac{0.10}{0.10})=4.74

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So, both buffer A and buffer B has same pH value which is also equal to pK_{a} . Buffer B has higher concentrations of the components as compared to buffer A, Hence, buffer B has the highest buffer capacity.

The pH of buffer C is far away from pK_{a} . Therefore, buffer C has the lowest buffer capacity.

     

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The resonance structure for the cyclopentadienyl anion is shown in the drawing below.

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