What's the importance of anatomy for pharmacy students
2 answers:
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Answer:
Astatine is a halogen with several isotopes that all have short half-lives.
Which of the following combinations of mass number and neutrons are possible as isotopes of astatine? Choose one or more:
i) A = 211, n = 127
ii) A = 210, n = 125
iii) A = 220, n = 134
iv) A = 207, n = 122
v) A = 209, n = 124
Explanation:
The mass number is the sum of the number of protons and the number of neutrons in an atom.
Atomic number of At(astatine ) =85
That means it has --- 85protons.
Its mass number A=210
Hence, the number of neutrons in At are:
Second option:
ii) A=210 , n=125 is the answer.
Correct answer: C) 3 eggs
The given recipe for preparing 100 brownies,
6 eggs + 5 cups flour + 2 sticks butter ----> 100 brownies
Assuming the number of each starting material/ product as the moles of each reactant/product. The mole ratios of the different reactants and product is:
;
;
We would need the mole ratio of eggs/brownies in order to find out the number of eggs required to prepare 50 brownies.