2. Calculate the number of particles in each of the following:
a. 72 g of Magnesium atoms.
b. 5 moles of Sodium atoms. get brainliest by doing step by step
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Answer:
a) 18.066 × 10^23 atoms b) 30.11 × 10^23
Explanation:
a)
To find number of atoms in 72 grams of Mg, first convert gram mass into number of moles then convert moles into number of atoms
Gram mass of Mg = m = 72 g
molar mass of Mg = M = 24 g/mol
number of moles = gram mass / molar mass
n= m/M
number of atoms= number of moles × Avogadro's Number
N = n × NA
= 3 × 6.022 × 10^23
= 18.066 × 10^23
b)
number of moles= n= 5 moles
Number of atoms = N = n × NA
= 5 × 6.022 × 10^23
= 30.11 × 10^23
n = 72/24
= 3 moles
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