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allochka39001 [22]
3 years ago
15

What is the mass, in grams, of a sample of 6.98 × 1024 atoms of magnesium (Mg)?

Chemistry
1 answer:
monitta3 years ago
5 0
N=6.98*10²⁴
Nₐ=6.022*10²³ mol⁻¹

n(Mg)=N/Nₐ

m(Mg)=n(Mg)M(Mg)=M(Mg)N/Nₐ

m(Mg)=24.3g/mol*6.98*10²⁴/(6.022*10²³mol⁻¹)=281.7 g
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Answer:

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The equation of reaction

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35 g x 1 mol/24.3 g of Mg x 2 mol of MgO/ 2 mole of Mg = 1.44 moles of MgO

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