Verified answer

a. 2.595 x 10²³ atoms

b. 1.008 x 10²⁵ atoms

Further explanation  

A mole is the number of particles (atoms, molecules, ions) contained in a substance that is the same amount as many atoms in 12 gr C-12  

1 mole = 6.02.10²³ particles  

N = n x No  

No = 6.02.10²³ = Avogadro's number  

Given

a. 0.431 mol of Li

b. 2.783 mol of methanol (CH3OH)​

Required

Number of atoms

Solution

a. 0.431 x 6.02.10²³ = 2.595 x 10²³ atoms

b.

In methanol, there are 1 C atom, 4 H atoms, and 1 O atom, total = 6 atoms

Number of molecules :

= 2.783 x 6.02.10²³

= 1.68 x 10²⁴

Number of atoms :

= 6 atoms/molecules x 1.68 x 10²⁴ molecules

= 1.008 x 10²⁵ atoms

Learn more  

the mole fractions of the solute and the solvent  

brainly.ph/question/2062141  

moles of CaCO3  

brainly.ph/question/2356002  

the mole ratio of Al to Cl2  

brainly.ph/question/2124499  

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