calculate the no. of particles in 69g of Sodium.
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Answered by
3
Number of particles = No: of moles × Avogadro no :
Given mass of Na (Sodium) = 46 g
Molar mass of Na = 23 g
No: of moles = Given mass ÷ Molar mass
= 46 ÷ 23
= 2 moles
∴ Number of particles = 2 moles × 6.022 × 10²³
= 12.044 × 10²³
takshtyagi:
given mass is 69 g
it is wrong
Answered by
9
atomic mass of Na=23u
Number of particles=Number of Moles x Na
⇒(given weight/ Gram atomic weight) x 6.023 x 10²³
=(69/23)x 6.023 x 10²³
=3x 6.023 x 10²³
⇒18.069 x 10 ²³Na particles
∴69 g of Na contains 18.069 x 10 ²³
it is wrong avogadro no. is 6.022 x 10^23
No,both are acceptable .
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