bezar77
10.11.2020 •
Mathematics
Question 1
III
Knowledge Check
The Barnes family bought 7 bags of cookies. Each bag had 13 cookies. They have since eaten 26 of the cookies. How many cookies do they have left?
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Ответ:
65
Step-by-step explanation:
7x13=91
91-26=65
thats the answer right there kid
Ответ:
10.8109 amu
Step-by-step explanation:
The average atomic mass of boron is determined as the average of the atomic masses of both isotopes weighed by their respective abundances.
Therefore, the average atomic mass is given by:
The average atomic mass of boron isotopes is 10.8109 amu.