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Displaying 5 out
of 125
questions & answers.
Q1.
The mass or an atom of oxygen is 16.0 u. Express it in kg.
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Answer:
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Given : mass of one atom of oxygen = 16.0 u
1 u = 1.66 x 10-27 kg
∴ The mass of an atom of oxygen
= 16.0 x 1.66 x 10-27 kg
= 2656 x 10-26 kg
Q2.
The mass or a molecule or hydrogen is 3.332 x 10-27 kg. Find the mass or 1 kg mol of hydrogen gas.
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answer not shownQ3.
The size of a particle is 4.6 μ. Express it in metre.
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Answer:
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Given : size of a particle = 4.6 μ
Since 1 μ = 10-6 m
∴ Size of a particle = 4.6 x 10-6m
Q4.
It takes 5 years for light to reach the earth from a star. Express the distance of star from the earth in (i) light year. (ii) km. Take speed of light = 3 x 108 m s-1 and 1 year = 3.1 x 107 s.
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answer not shownQ5.
The average mass of an atom of uranium is 3.9 x 10-25 kg. Find the number of atoms in 1 g or uranium .
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Answer:
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Given : mass of one atom of uranium = 3.9 x 10-25 kg = 3.9 x 10-22 g
(since 1 kg = 103 g)
∴ Number of atoms in 1 g uranium
= 1/3.9x10-22 = 2.6 x 1021
