N2(g) + 3 H2(g) → 2 NH3(g) ΔH= -91.8 kJ Determine ΔH for:

4 NH3(g) → 2 N2(g) + 6 H2(g)

What does the cell nucleus do or, how does it function?

To apply in a gold the individual gold atoms are united to each other by means of a metallic bond. how would you use the gold block to determine the atomic radius of a gold atom?

How much carbon is stored in the atmosphere as co2