The answer is 2. this makes the equation 2Cu + S8 —> Cu2S
The main difference between gas pressure and vapour pressure is that gas pressure is exerted by the gases above the surface of a substance whereas vapour pressure is exerted by liquids above the surface of a substance
I believe the best answer is D.
All answers contribute to a machine, if there is an all above choice, chose that.
Answer:
20 km
Explanation:
he walks 10 km + another 10 km so 20 :)
