A) \[0.25\] gram atoms, \[6.023\times {{10}^{-23}}\] atoms
B) \[0.25\] gram atoms, \[1.50\times {{10}^{-23}}\] atoms
C) \[0.1\] gram atoms, \[6.023\times {{10}^{23}}\] atoms
D) \[0.1\] gram atoms, \[1.50\times {{10}^{23}}\] atoms
Correct Answer: B
Solution :
\[40\,\,g\] of calcium constitutes one gram atom. \[10\,\,g\] of calcium accounts for gram atom\[=\] \[\frac{1}{40}\times 30=0.25\]gram atoms According to Avogadro's number, the number of atoms in \[1\,\,g\] of calcium\[=6.023\times {{10}^{23}}\] The number of atoms in \[0.25\] gram atom\[=0.25\times 6.023\times {{10}^{23}}=1.50\times {{10}^{23}}\]atoms.
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