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umka21 [38]
3 years ago
12

5. The element copper has naturally occurring isotopes with mass numbers of 63

Chemistry
2 answers:
natali 33 [55]3 years ago
4 0

Answer:

63.616

Explanation:

DATA

1. first atomic mass;m1=63

  1. second atomic mass;m2=65
  2. first percentage;p1= 69.2%
  3. second percentage me;p2=30.8%
  4. average mass;avg= ?

SOLUTION

avg=<u> (m1)(p1) + (m2)(</u><u>p2</u><u>)</u>

100

avg= <u>(63)(69.2) + (65)(30.8)</u>

100

avg= <u>4</u><u>3</u><u>5</u><u>9</u><u>.</u><u>6</u><u> </u><u>+</u><u> </u><u>2</u><u>0</u><u>0</u><u>2</u>

100

avg= <u>6361.6</u>

100

avg= 63.616

Ganezh [65]3 years ago
4 0

Answer:

63.616

Explanation:

you calcute to get the results

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<em>Where pKb is -log Kb = 4.74 and [] are moles of both compounds.</em>

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