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3 years ago

What value must be known if the accuracy of an experiment is to be determined

1 answer:

7 0

To evaluate the accuracy of a measurement, the measured value must be compared to the correct value. To evaluate the precision of a measurement, you must compare the values of two or more repeated measurements.

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Naturally occurring element X exists in three isotopic forms: X-28 (27.979 amu, 92.21% abundance), X-29 (28.976 amu 4.70% abunda

bezimeni [28]

Answer: The average atomic mass of X is 28.09 amu

Explanation:

Average atomic mass of an element is defined as the sum of masses of each isotope each multiplied by their natural fractional abundance.

Formula used to calculate average atomic mass follows:

$\text{Average atomic mass }=\sum_{i=1}^n\text{(Atomic mass of an isotopes)}_i\times \text{(Fractional abundance})_i$ .....(1)

For isotope 1:

Mass of isotope 1 = 27.979 amu

Percentage abundance of isotope 1 = 92.21 %

Fractional abundance of isotope 1 = 0.9212

For isotope 2:

Mass of isotope 2 = 28.976 amu

Percentage abundance of isotope 2 = 4.70 %

Fractional abundance of isotope 2 = 0.0470

For isotope 3:

Mass of isotope 3 = 29.974 amu

Percentage abundance of isotope 3 = 3.09 %

Fractional abundance of isotope 3 = 0.0309

Putting values in equation 1, we get:

$\text{Average atomic mass of X}=[(27.979\times 0.9212)+(28.976\times 0.0470)+(29.974\times 0.0309)]$

$\text{Average atomic mass of X}=28.09amu$

Hence, the average atomic mass of X is 28.09 amu

4 0

3 years ago

A metal, M, forms an oxide compound with the

lapo4ka [179]

Answer:

Group 1

Explanation: because the compound has a formula of M2O , the number of valence electrons of M should be 1.

5 0

3 years ago

The blank

Alik [6]

I think it’s “number” and “type”

5 0

3 years ago

Which pair of elements would most likely form a covalent bond

denpristay [2]

Answer:

Nonmetals and nonmetals tend to form covalent bonds.

P and S

Explanation:

5 0

2 years ago

When a reaction forms between atoms with ground state electron configuration 1s22s2 and 1s22s22p5 the predominant type of bond f

Arisa [49]

C. Ionic is the answer

6 0

2 years ago

What value must be known if the accuracy of an experiment is to be determined​

What value must be known if the accuracy of an experiment is to be determined