Question

plss answer...with proper explaination and calculations.
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Answer 1

Answer:

Both option (a) and (d) are correct.

Explanation:

For converting weight of element/compound into no. of atoms, we must divide the given weight by the total atomic weight of the element/compound and then multiply it by NA (= 6.022 * 10^23).

Solution:

(a) 18 g of water

atomic weights : H = 1, O = 16

No. of atoms = [18 / (2*1 + 16)] * NA

                      = [18 / 18] * NA

                      = NA atoms.

(b) 16 g of O2

atomic weights : O = 16

No. of atoms = [16 / (2*16)] * NA

                      = [16 / 32] * NA

                      = (NA/2) atoms.

(c) 4.4 g of CO2

atomic weights : C = 12, O = 16

No. of atoms = [4.4 / (12 + 2*16)] * NA

                      = [4.4 / 44] * NA

                      = (NA/10) atoms.

(d) 16 g of CH4

atomic weights : C= 12, H = 1

No. of atoms = [ 16 / (12 + 4*1)] * NA

                      = [16 / 16] * NA

                      = NA atoms.

:)