Ca(s) + 2H2O(l) + Ca(OH)2(aq) + H2(9) When 40.1 grams of Ca(s) reacts completely
with the water, what is the total volume, at STP,
of II,(g) produced?
(1) 1.00 L
(3) 22,4 L
(2) 2.00 L
(4) 44.8 L

the correct answer is a

the equation that correctly represent the reaction for formation of ammonia is

n2+ 3h2 → 2nh3 (answer d)

1 mole of nitrogen gas (n2) react with 3 moles of hydrogen gas (h2) to form 2 moles of ammonia ( nh3). this is in a process known as haber process were iron is used as a catalyst and reaction take place that a higher temperature and pressure. the process is exothermic hence energy is released.

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.