Question

(a) Describe Bohr's model of atom.
(2+2+1)
(b) 18 g of glucose (C6H1206) is mixed with 1.8 g of water (H2O) in a glass, calcu-
late number of atoms of oxygen in the glass.
(c) Define the following terms:
(i) Gram-molecular mass
(ii) Mole
Atomic masses of elements for reference:
Atomic masses of H, C, 0, Na, Mg, S, CI, Ca are 1, 12, 16, 23, 24, 32, 35.5 and
40 u respectively

Answer 1

Answer:

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Answer 2

Answer:

Percentage composition of a compound is a ratio of an amount of each element to the total amount of individual elements in a compound, which is then multiplied with 100. Let us take an example of H2O i.e. Water. Water has 2 molecules of hydrogen, and one mole of water is of 18.0152 grams. And one mole of a hydrogen atom is of 1.008 grams. So, 2 hydrogen moles weighs 2.016 grams. Hence, one mole of water has 2.016 grams of hydrogen mole. Therefore, the percentage composition of hydrogen would be 2.016/18.0152 = 11.19%. Now let us study in detail about Percentage give thanks