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sleet_krkn [62]
3 years ago
12

What part of your skeleton system is called the exact same thing but is located in different places

Chemistry
1 answer:
Alex73 [517]3 years ago
7 0

Answer:

Phalanges

Explanation:

Phalanges are located in both the hands (the bones that make up the fingers) and the feet (the bones that make up the toes)

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A certain radioactive nuclide has a half life of 1.00 hour(s). Calculate the rate constant for this nuclide. s-1 Calculate the d
Karo-lina-s [1.5K]

Answer:

k= 1.925×10^-4 s^-1

1.2 ×10^20 atoms/s

Explanation:

From the information provided;

t1/2=Half life= 1.00 hour or 3600 seconds

Then;

t1/2= 0.693/k

Where k= rate constant

k= 0.693/t1/2 = 0.693/3600

k= 1.925×10^-4 s^-1

Since 1 mole of the nuclide contains 6.02×10^23 atoms

Rate of decay= rate constant × number of atoms

Rate of decay = 1.925×10^-4 s^-1 ×6.02×10^23 atoms

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Answer:

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What is the correct noble gas configuration for Ba?
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2. Calculate the number-average molecular weight of a random poly (isobutylene-isoprene) copolymer in which the fraction of isob
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Answer : The number-average molecular weight is, 97500 g/mol

Explanation :

First we have to calculate the molecular weight of isobutylene and isoprene.

The molecular formula of isobutylene and isoprene is, C_4H_8 and C_5H_8

Molecular weight of C_4H_8 = 4(12 g//mol) + 8(1 g/mol) = 56 g/mol

Molecular weight of C_5H_8 = 5(12 g//mol) + 8(1 g/mol) = 68 g/mol

Now we have to calculate the average repeat molecular weight.

Average repeat molecular weight = 0.25\times (56g/mol)+(1-0.25)\times (68g/mol)

Average repeat molecular weight = 65 g/mol

Now we have to calculate the number-average molecular weight.

Number-average molecular weight = Average repeat molecular weight × Degree of polymerization

Number-average molecular weight = (65 g/mol) × (1500)

Number-average molecular weight = 97500 g/mol

Thus, the number-average molecular weight is, 97500 g/mol

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