Answer :

To find the mass of a substance given its density and volume, we can use the formula:

[tex]\[ \text{mass} = \text{density} \times \text{volume} \][/tex]

Given data:
- The density of the substance is [tex]\( 9 \, \text{gm/cm}^3 \)[/tex]
- The volume of the substance is [tex]\( 50 \, \text{cm}^3 \)[/tex]

Now, plug in the values into the formula:

[tex]\[ \text{mass} = 9 \, \text{gm/cm}^3 \times 50 \, \text{cm}^3 \][/tex]

Perform the multiplication:

[tex]\[ \text{mass} = 450 \, \text{gm} \][/tex]

So, the mass of the substance is [tex]\( 450 \, \text{gm} \)[/tex].