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Structure of Atom

Short Answer Type

111.

If the diameter of a carbon atom is 0.15 nm, calculate the number of carbon atoms which can be placed side by side in a straight line across length of scale of length 20 cm long.

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112. 2 X 10⁸ atoms of carbon are arranged side by side. Calculate the radius of carbon atom if the length of this arrangement is 2.4 cm.

We have given,

Length of the given arrangement =2.4 cm

Number of carbon atoms present =2 x 10⁸

Therefore, diameter of carbon atom

= 2.4x10^-2 m/2 x10⁸ =1.2 x10^-10m

Thus, radius of carbon atom = Diameter/2

=1.2 x10^-10/2 =6.0 x10^-11m

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Long Answer Type

113. The diameter of zinc atom is 2.6 Å. Calculate: (a) radius of zinc atom in pm and (b) number of atoms present in a length of 1.6 cm if the zinc atoms are arranged side by side lengthwise.

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Short Answer Type

114.

A certain particle carries 2.5 X 10^-16C of static electric charge. Calculate the number of electrons present in it.

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115.

In Milikan's experiment, static electric charge on the oil drops has been obtained by shining X-rays. If the static electric charge on the oil drop is - 1.282 X 10^-18C, calculate the number of electrons present on it.

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116.

Calculate the total number of electrons present in one mole of methane.

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117. Find: (a) the total number and (b) the total mass of neutrons in 7 mg of ¹⁴C. (Assume that mass of a neutron = 1.675 X 10^-27 kg).

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Long Answer Type

118.

Find: (a) the total number and (b) the total mass of protons in 34 mg of NH₃ at STP.
Will the answer change if the temperature and pressure are changed ?

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