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Lemur [1.5K]
3 years ago
7

What do 8th graders do for science

Biology
2 answers:
d1i1m1o1n [39]3 years ago
8 0
They start to learn about elements and priciples of an element

sineoko [7]3 years ago
6 0
What do you mean "science?" Which? Im in 8th grade taking Biology, Chemistry, and Physics.
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What is the average atomic mass of a sample that has two isotopes, one with a mass of 21 amu at 62% abundance and another with a
motikmotik

Answer:

Average atomic mass = 21.38 amu.

Explanation:

Given data:

Mass of first isotope = 21 amu

Abundance of first isotope = 62%

Mass of second isotope = 22 amu

Abundance of second isotope = 38%

Average atomic mass = ?

Solution:

Average atomic mass  = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass)  / 100

Average atomic mass  = (62×21)+(38×22) /100

Average atomic mass =  1302 +836 / 100

Average atomic mass = 2138 / 100

Average atomic mass = 21.38 amu.

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