Answer:
4.98x10^-3 mole
Explanation:
According to Avogadro's hypothesis, 1 mole of any substance contains 6.02x10^23 atoms. This greatly implies that 1 mole of calcium will also contain 6.02x10^23 atoms.
Now, if 1 mole of calcium contains 6.02x10^23 atoms,
then Xmol of calcium will contain 3x10^21 atoms i.e
Xmol of calcium = 3x10^21/6.02x10^23
Xmol of calcium = 4.98x10^-3mol
Therefore, 4.98x10^-3 mole of calcium contains 3x10^21 atoms
it’s C
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