What is the physical state of butanoic acid at 0 degree?

Which of these conditions most likely produces an unstable isotope?

The number to the right of an element's symbol (ex. c-12) identifies the of an isotope.

1. if you have a gas at 127 degrees c, what is it's absolute temperature (kelvin)? a. 200kb. 300kc. 400kd. 500k2. if you had a gas whose absolute temperature measured 45 k, what is that temperature in celsius? a. -228 cb. -300 cc. 125 cd. 112 c