Q4. Which of the following substances will be a solid at 20 °C and will melt when placed in a beaker of hot
water at 80 °C?
melting point in °C
boiling point in °C
249
ОА
122
59
B
-7
30
2403
27
D
-32​

> b takes place in the gas phase in an isothermal tubular reactor. the feed is one mole of a per one mole of c, an inert. the entering temperature and pressure are 427°c and 10 atm, respectively. the gas constant r = 0.08206 atm · l/mol · k.

i think that the answer is c

you did not give any options thus this is the best answer i can give to you with this little information you have given

> they are both natural and not man made

> they can be tracked and predicted by the right tools

-love shrooms