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VashaNatasha [74]
3 years ago
14

Calculate the mass defect of the helium nucleus 32he. the mass of neutral 32he is given by mhe=3.016029amu. express your answer

in atomic mass units to four significant figures.
Physics
1 answer:
Romashka [77]3 years ago
4 0
Answer: 0.007044 g

Explanation:

1) mass defect is the difference between the mass of the nucleus and the sum of the masses of the protons and neutrons.

3) He has two protons.

4) The istope given is ³₂ He, which means it has 2 protons and 1 neutron.

5) The masses of neutrons and protons are taken from a table (from a textbook or the internet)

Mass of 2 mol of protons: 2 × 6.022 × 10 ²³ protons/mol × 1.6726 × 10 ⁻²⁴ g/mol = 2.014447944 g

Mass of 1 mol of neutrons = 1 × 6.022 × 10²³ neutrons/mol × 1.6749 × 10 ⁻²⁴ g/mol = 1.00862478 g

Sum = 2.014447944 g + 1.00862478 g = 3.023072724 g

6) mass deffect = 3.023072724g - 3.016029 g = 0.007043724

7) Round to 4 significant figures: 0.007044 g

That is the answer: 0.007044 g


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3 years ago
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Answer:

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Where m is the mass of the student, g is gravity (9.8 m/s) and d is the total distance going up the stairs (0.15m *85steps= 12.75m )

W= F*d= m*g*d=85* 9.8*12.75=10620.75 [J]

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2.537 ---> 20%

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x=\frac{2.537*100}{20} =12.685

So the student is consuming 12.685 KCals each time he runs up the stairs.

Now,

1 g --> 9 Kcals

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Burning 1 g of fat, requieres 9 KCals, 1000g burns 9000KCals. So in order to burn a 1Kg of fat:

\frac{9000Kcals}{12.685Kcals} =709.5 times

He must run up the stairs 709.5 times, to burn 1 Kg of fat.

********************

For b) just converting units, taking into account the time lapse. (53103.75 is the 100% of the energy in joules, from converting 12.685Kcals to joules)

Power=\frac{Joules}{Seconds} =\frac{53103.75}{50} =1062.075 [W]\\

P(hp)=\frac{P(w)}{745.7} =\frac{1062.075}{745.7} =1.42[hp]

*****

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