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Atomic mass of calcium is 40. The mass of 2.5 gram atoms of calcium is _______. 
  • a)
    40 g
  • b)
    2.5 g
  • c)
    100 g
  • d)
    80 g
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
Atomic mass of calcium is 40. The mass of 2.5 gram atoms of calcium is...
Calculation of Mass of 2.5 gram atoms of Calcium

Given: Atomic mass of Calcium = 40

To find: Mass of 2.5 gram atoms of Calcium

Formula: Mass of 1 mole of Calcium (in grams) = Atomic mass of Calcium (in amu)

1 mole of Calcium = Avogadro's number of atoms of Calcium = 6.023 x 10^23 atoms

Hence, mass of 1 mole of Calcium = Atomic mass of Calcium = 40 g

To find the mass of 2.5 gram atoms of Calcium, we need to first find the mass of 1 atom of Calcium.

Mass of 1 atom of Calcium = Mass of 1 mole of Calcium / Avogadro's number of atoms of Calcium

= 40 g / 6.023 x 10^23 atoms

= 6.647 x 10^-23 g

Now, to find the mass of 2.5 gram atoms of Calcium, we simply multiply the mass of 1 atom of Calcium by 2.5 gram atoms.

Mass of 2.5 gram atoms of Calcium = 2.5 g / 1 atom of Calcium x Mass of 1 atom of Calcium

= 2.5 g / 1 x 6.647 x 10^-23 g

= 100 g

Therefore, the mass of 2.5 gram atoms of Calcium is 100 g.
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Community Answer
Atomic mass of calcium is 40. The mass of 2.5 gram atoms of calcium is...
100 g.
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Atomic mass of calcium is 40. The mass of 2.5 gram atoms of calcium is _______.a)40 gb)2.5 gc)100 gd)80 gCorrect answer is option 'C'. Can you explain this answer?
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