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Ede4ka [16]
3 years ago
12

Describe the range of em radiation

Chemistry
1 answer:
natima [27]3 years ago
3 0
The range for em radiation should be a range of 50 yards hope this help's. <span />
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Why don't we use meters or miles when discussion distances between stars or galaxies?
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3 years ago
There are two isotopes of an unknown element, X-19 and X-21. The abundance of X-19 is 14.55%. A weighted average uses the percen
alekssr [168]

Answer:

2.765amu is the contribution of the X-19 isotope to the weighted average

Explanation:

The average molar mass is defined as the sum of the molar mass of each isotope times its abundance. For the unknown element X that has 2 isotopes the weighted average is defined as:

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The contribution of the X-19 isotope is its mass (19.00 amu) times its abundance (14.55% = 0.1455). That is:

19.00amu * 0.1455 =

2.765amu is the contribution of the X-19 isotope to the weighted average

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