Question

The number of hydrogen atoms present in `25.6 g` of sucrose `(C_12 H_22 O_11)` which has a molar mass of `342.3g` is :
A. `22xx10^(23)`
B. `9.91xx10^(23)`
C. `11xx10^(23)`
D. `44x10^(23) H` atoms

Answer 1

Correct Answer - B
No. of moles of sucrose `=25.6/342.3=0.075`
1 mole of sucrose contains `22x6.023xx10^(@3)` of H-atom
0.075 moles of sucrose contain `=0.075xx6.023xx10^(23)xx22`
`=9.91xx10^(23)` of H-atoms.