The total number of electrons in 18 mL of water (density = 1 g `mL^(-1)` ) is

Options

A. `6.02 xx 10^23`
B. `6.02 xx 10^25 `
C. `6.02 xx 10^24 `
D. `6.02 xx 18xx 10^23`

Answer

C

Explanation

Mass of water ` = 18 mL xx 1g mL^(-1) = 18 g `
or = 1 mol
No. of molecules in 1 mol of water
` = 6.02 xx 10^23`
No. of electrons in 1 molecule of water
= 2 + 8 = 10
` therefore ` No. of electrons in 1 mol of water
` = 6.02 xx 10^23 xx 10`
` = 6.02 xx 10^24 `