The RGB color value "rgb(229 231 235)" can be converted to its equivalent hexadecimal (hex) representation. Each component of the RGB value (red, green, and blue) has a range from 0 to 255. To convert it to hex, you need to convert each component to its hex equivalent and then concatenate them.

Here's how you can convert the given RGB value to hex:

1. Convert the red component (229) to hex: 229 => E5

2. Convert the green component (231) to hex: 231 => E7

3. Convert the blue component (235) to hex: 235 => EB

Now, concatenate the hex values of each component: E5E7EB

So, the equivalent hex color code for "rgb(229 231 235)" is "#E5E7EB".