"Synthesis gas" can be produced by the catalytic re-forming of methane with steam. The reactions are: CH4(g) + H2O(g) → CO(g) + 3H2(g) CO(g) + H2O(g) → CO2(g) + H2(g) Assume equilibrium is attained for both reactions at 1 bar and 1300 K

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.

c (diamond),

sio2 (quartz)