Respuesta :
we know [tex] C_{5} H_{12} [/tex] is alkane group of molecular formula [tex] C_{n} H_{2n+2} [/tex] is pentane.
pentane will have three different structural isomer what ever the position of carbon and hydrogen changes mass will be same.which is an physical property.so mass remains same in all three forms of pentane.
Explanation:
Physical property is the property of a substance which can be observed or measured without changing the identity of substance.
For example, color, mass etc are the physical properties.
Therefore, for isomer of [tex]C_{5}H_{12}[/tex] a physical property that will remain similar for its isomer will be its mass.