Hydrogen + oxygen --> water
2,1g + 16,8g = x
x = 18,9g
Answer:

Explanation:
Oxygen has eight eletrons and six valence electrons, giving it the electron configuration of
.
The change from figure one to figure two was most likely caused by erosion. Erosion is the process of something being eroded by wind, water, or other natural agents.
Answer: See attached image
Explanation: