Chemistry

Problem

The density of gold is

19 \text{ g}/\text{cm}^3

. If

1.9 \times 10^{-4}

g of gold is dispersed in one litre of water to give a sol having spherical gold particles of radius 10 nm, then the number of gold particles per

\text{mm}^3

of the sol will be : a.

1.9 \times 10^{12}

6.3 \times 10^{14}

6.3 \times 10^{10}

2.4 \times 10^6