The food chain always begins with a sun without it there would be no food chain... hope this helped!
If you need half the volume, you need double the pressure (V * p). Normal air pressure in the atmosphere is 101300 Pa so that means you need double that, thus 202600 Pa (or 2,026 bars)
Formula:

Given:
Density=3.4
Volume=500.0
Plug them into the formula:
Final answer: 1700g
Answer:
Ca(NO3)2 is Calcium Nitrate
Ca(NO2)2 is Calcium Nitrite
Ca3N2 is Calcium Nitride
Explanation: