Question

calculate the number of particles in
(a) 46 g of Na atom
(b) 8 g of O2 moles
(c) 0.1 moles of carbon atom

Answer 1

a)46g of Na atom
atomic mass of Na=23u
Number of particles=Number of Moles x N
⇒(given weight/ Gram atomic weight) x 6.023 x 10²³
=(46/23)x 6.023 x 10²³
=2x 6.023 x 10²³
⇒12.046 x 10 ²³Na particles
∴46 g of Na contains 12.044 x 10 ²³
 b)8g of O2 moles
molecular mass of O2=32u
No. Of  molecules in O2 molecules=(8/32) x 6.022 x 10²³⇒0.25 x 6.023 x 10 ²³
⇒1.5055x 10 ²³ molecules

∴8g of O2 contains 1.5055x 10²³ molecules
c)0.1 moles of Carbon atom
1mole of carbon atom = 12 g of carbon  contains 6.022 x 10²³ carbon atoms
0.1 moles of carbon contain =0.1 x 6.023 x 10²³
⇒ 6.023x10²² carbon atoms
∴0. mole contains  6.023x10²² carbon atoms

Answer 2

Answer:

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