What is the percent of nitrogen (N) by mass in a 55.0 g sample of Fe(NO3)3? The molar mass of Fe(NO3)3 is 241.86 g/mol. 1. 9.55 g
2. 9.55%
3. 5.80 g
4. 52.2%
5. 17.4 g
6. 5.80%
7. 17.4%
8. 52.2 g

why is arctic sea ice important? arctic sea ice keeps the polar regions cool and moderate global climate. sea ice has a bright surface; 80 percent of the sunlight that strikes it is reflected back into space. as sea ice melts in the summer, it exposes the dark ocean surface.

distance, luminosity, brightness, radius, chemical composition, and temperature

increased stability in the completion of fluorine's outer shell.