Question

calculate the voulme if the density is 19300kg/m3 and mass is 200 g​

Answer 1

Your units are back to front, the density of gold is 19,300 kg/m^3 (Source:- Science Data Book - R.M. Tennant)

You need the volume in cubic meters but you have been given the dimensions in cm.

Units must match, so the dimensions must also be in meters. To convert, divide the centimeters by 100, then multiply them together to get the volume in cubic meters.

0.10 x 0.05 x 0.20 = 0.001 m^3

Multiply by the density to get the mass of the gold block.

0.001 x 19,300 = 19.3 kg