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Yakvenalex [24]
3 years ago
10

What is the mass, in grams, of a sample of 6.98 × 10^24 atoms of magnesium (Mg)?

Chemistry
1 answer:
Blizzard [7]3 years ago
4 0
The number of moles in a substance indicates the amount of the substance that contains the same number of particles as 12 g of the Carbon-12 isotope [or equivalent to 6.02 × 10²³ (which is used as a standard in the world of moles).

Now,

          if     6.02 × 10²³ atoms are found in 1 mole of Mg
   then let  6.98 × 10²⁴ atoms are found in     x

⇒     x  =    (6.98 × 10²⁴)  ÷  (6.02 × 10²³)
            =  11.595 mol

Also, 
    Mass = Mole  ×  Molar Mass

∴ Mass of Mg = 11.595 mol  ×  24 g / mol
                       = 278.27 g 
<span>
The mass of a sample of 6.98 × 10</span>²⁴ atoms of magnesium (Mg) would contains   278.27 g    
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