Question

# What mass of $$Na$$ will contain $$6.023 \times 10^{23}$$ number of atoms?

A
23 g
B
46 g
C
6.023 g
D
11.5 g

Solution

## The correct option is A $$23$$ gOne mole of each substance contains $$N_A = 6.023\times10^{23}$$ atoms. Here $$N_A$$ = Avogadro number.Mass of one mole of atoms = Molar massSo, the mass of one mole of $$Na$$ = $$23$$ g = $$6.023 \times 10^{23}$$ number of atoms. (Atomic mass of $$Na$$ = $$23$$ u and molar mass is numerically equal to the atomic mass)Hence, option A is correct.Chemistry

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