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Atomic Mass and Atomic Mass Unit

The atomic ma...

Question

The atomic mass of calcium of 40u. What will be the number of calcium atoms in 0.4u of calcium

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Solution

Given:
the atomic mass of calcium is 40u.
No. of moles =given weight/molecular weight
No. of Cu moles=0.4/40=1/00=0.01moles
We know that 1 mole of any substance contains 6.023 x 10²³ atoms/ molecules/ions
1mole of Ca contains=6.023 x 10²³ atoms of Ca
0.01 mole of Ca contains =6.023 x10²¹ atoms of calcium.

∴The no. of calcium atoms in 0.4 u of calcium are 6.023 x10²¹ atoms

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