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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.

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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).

(a) 1 g atom of carbon = 14g
= 6.022 x 10²³atoms
Each carbon atom

(b) Mass of 1 neutron = 1.675 x 10^-27 kg
Mass of 2.4088 x 10²¹neutrons
= (1.675 x 10^-27kg) x (2.4088 x 10²¹)
= 4.0347 x 10^-6kg

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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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