One kilogram of air is heated reversibly at constant pressure from an initial state of 300 k and 1 bar until its volume triples. calculate w, q, ∆u, and ∆h for the process. assume for air that pv/ t = 83.14 bar cm3/ mol k and cp = 29 j / mol k. ans [w= 74.895 kj; q= 602.08 kj; δu= 12.41 kj/mol; δh=17.4 kj/mol] 3.
b)1 kg of saturated water vapour at 3.166 kpa and 25oc enters a compressor and discharges at 101.33 kpa and 100 oc (saturated water vopur). assuming that no heat is release during the compression, how much compression work are required?

calculate how many grams of ammonia can be produced from 4.21 grams of

n2 + 3h2 = 2nh3

my answer:

25.0g n2 x (1 mol/ 28.0gn2) x (2 mol nh3/ 1 mol n2) x (17.0g nh3/ 1 molnh3) = 30.36g n2

25.0g h2 x (1 mol h2/ 2.00g h2) x (2 mol nh3/ 3 mol h2) x (17.0g nh3/ 1 mol nh3) = 141.67g h2

lr = n2

answer: you could do some invislibe ink.

explanation: i will tell you how to if u answer my question.

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.